94 + Interview Questions in Other Environments in Corrosion Engineering Page 2 InterviewSolution

51.	Which of the following type of corrosion Is usually encounters for various materials in liquid metal environment?(a) Uniform corrosion(b) Stress cracking corrosion(c) Crevice corrosion(d) Pitting corrosionI have been asked this question at a job interview.This interesting question is from Environments topic in section Other Environments of Corrosion Engineering
Answer» The correct answer is (B) STRESS cracking corrosion Explanation: Stress cracking corrosion is a type of corrosion that usually encountered in various materials in a LIQUID METAL environment. This is due to the chemisorption of liquid-metal atoms and a reduction in tensile strength at the crack tip.

Discussion

52.	Which of the following corrosion protective systems is/are included in aircraft industries?(a) Anodizing, cladding and conversion coatings(b) Anodizing and cathodic protection(c) Conversion coatings and anodizing(d) Cathodic protection onlyThis question was posed to me in an interview for internship.My doubt is from Environments in division Other Environments of Corrosion Engineering
Answer» Right option is (a) Anodizing, cladding and CONVERSION coatings Explanation: Anodizing, cladding, and conversion coatings are the corrosive protective SYSTEMS used in aircraft INDUSTRIES. Whereas cathodic protection cannot be used in the aircraft INDUSTRY DUE to non-conductive electrolytes.

Discussion

53.	Which of the following coatings is/are used for the prevention of microbiological corrosion in buried steel?(a) Asphalt(b) Enamel(c) Plastic tape(d) Asphalt, enamel and plastic tapeI have been asked this question during an online exam.The doubt is from Environments in portion Other Environments of Corrosion Engineering
Answer» The correct choice is (d) Asphalt, ENAMEL and PLASTIC tape The best I can explain: Microbiological corrosion INFLUENCES the corrosion of buried steel structures in soil. This can be PREVENTED by coatings such as asphalt, enamel, and plastic tape.

Discussion

54.	Rusting of high-strength steel due to resident water can cause stress-corrosion and hydrogen embrittlement.(a) False(b) TrueThis question was posed to me in homework.I need to ask this question from Environments topic in portion Other Environments of Corrosion Engineering
Answer» Correct option is (b) True The explanation is: RUSTING of high-strength STEEL due to resident WATER can cause stress-corrosion and hydrogen embrittlement. Hydrogen CHARGING of steel during ELECTROPLATING can cause a brittle fracture.

Discussion

55.	Which of the following materials is/are used for blast nozzles in aerospace?(a) Aluminum oxide and cemented tungsten carbide(b) Aluminum oxide cemented tungsten carbide and boron carbide(c) Cemented tungsten carbide only(d) Aluminum oxide and boron carbideI got this question in an internship interview.My query is from Environments topic in portion Other Environments of Corrosion Engineering
Answer» Correct option is (b) Aluminum OXIDE cemented TUNGSTEN carbide and boron carbide Easy explanation: Aluminum oxide, cemented tungsten carbide, and boron carbide is the materials that are USED for blast nozzles in aerospace. These materials are also known as REFRACTORY materials.

Discussion

56.	Which of the following metals have high resistance to crevices in quiet seawater?(a) Hastelloy C(b) Titanium(c) Hastelloy C and Titanium(d) Nickel-copper alloyThe question was asked in semester exam.This question is from Environments topic in section Other Environments of Corrosion Engineering
Answer» The correct OPTION is (C) Hastelloy C and Titanium For explanation I would say: Hastelloy C and titanium have high resistance to crevices in QUIET seawater. Due to this, these metals are used for various corrosive seawater APPLICATIONS. Whereas nickel-copper alloy shows less resistance.

Discussion

57.	Thiobacillusthiooxidans are the type of aerobic bacteria that are capable of oxidizing sulfur-bearing compounds to sulfuric acid.(a) False(b) TrueI had been asked this question in an interview for job.I want to ask this question from Environments in section Other Environments of Corrosion Engineering
Answer» Correct choice is (b) True For explanation I would say: Thiobacillusthiooxidans are the type of aerobic bacteria that are capable of oxidizing ELEMENTAL sulfur and sulfur-bearing compounds to SULFURIC acid. 2S+3O2+2H2O==>2H2SO4 is the general chemical REACTION of sulfur-oxidizing bacteria.

Discussion

58.	Which of the following environments in which the biological activity may influence corrosion?(a) Soil(b) Fresh and seawater(c) Petroleum products(d) Soil, freshwater, seawater and petroleum productsThis question was addressed to me during an interview.Enquiry is from Environments in division Other Environments of Corrosion Engineering
Answer» CORRECT choice is (d) Soil, freshwater, seawater and petroleum products For explanation I would SAY: Biological ACTIVITY will influence the corrosion of materials in a VARIETY of environments including soil, freshwater, seawater, and petroleum products. These living organisms are sustained by CHEMICAL reactions.

Discussion

59.	Which of the following is/are true regarding underground structures?(a) Ordinary carbon steels and cast irons are commonly used(b) Organic coatings can be used(c) Cathodic protection is applied to protect it from corrosion(d) Usually made of carbon steel and cast irons with or without organic coatings and supported by a cathodic protection systemThis question was addressed to me during a job interview.The query is from Environments topic in chapter Other Environments of Corrosion Engineering
Answer» Correct option is (d) Usually made of carbon steel and CAST irons with or without ORGANIC coatings and SUPPORTED by a cathodic protection system Best EXPLANATION: Underground structures are usually made up of ordinary carbon steels and cast irons with or without organic coatings. These structures are also supported by a cathodic protection system to MINIMIZE corrosion.

Discussion

60.	Corrosion decreases with an increase in the purity of water.(a) True(b) FalseI have been asked this question during an online exam.I'd like to ask this question from Environments in portion Other Environments of Corrosion Engineering
Answer» RIGHT option is (a) True For explanation: Corrosion DECREASES with increasing purity of the water because of less solid and GASES and increasing electrical resistance. Resistance is a measure of water purity.

Discussion

61.	Which of the chemical is/are added for the removal of hydrogen sulfide and neutralization?(a) Sodium hydroxide(b) Lime(c) Sodium hydroxide and lime(d) Naphthenic acidThis question was addressed to me in a national level competition.I need to ask this question from Environments in portion Other Environments of Corrosion Engineering
Answer»

Discussion

62.	Which of the following acids are produced by microorganisms such as fungus and mold?(a) Oxalic acid(b) Lactic acid(c) Acetic acid(d) Oxalic acid, lactic acid, acetic acid, and citric acidI had been asked this question by my school teacher while I was bunking the class.This intriguing question comes from Environments in section Other Environments of Corrosion Engineering
Answer» The correct CHOICE is (d) Oxalic acid, lactic acid, acetic acid, and citric acid Easy explanation: Macroorganisms such as fungus and mold are also capable of INFLUENCING corrosion of metals in many ENVIRONMENTS. They assimilate organic MATTER and can produce considerable amounts of ACIDS such as oxalic acid, lactic acid, acetic acid, and citric acid.

Discussion

63.	Which of the following alloy has high cavitation resistance that usually used for ship propellers and pumps impellers in seawater?(a) Titanium(b) Stellite(c) 17-7 Stainless steel(d) Nickel aluminum bronzeThe question was posed to me in semester exam.Enquiry is from Environments in section Other Environments of Corrosion Engineering
Answer» Right ANSWER is (b) Stellite Easy explanation: Stellite is a cobalt-chromium alloy with HIGH cavitation resistance that usually used for ship propellers and pump IMPELLERS in seawater. Composition of Stellite is 27–32% chromium, 4–6% tungsten, 0.9–1.4% CARBON, with additions of nickel, iron, silicon, manganese, and molybdenum and cobalt as balance.

Discussion

64.	Corrosion by seawater at greater depth is usually decreased because of the lower temperature.(a) False(b) TrueI had been asked this question in my homework.I would like to ask this question from Environments in division Other Environments of Corrosion Engineering
Answer» The CORRECT ANSWER is (b) True To ELABORATE: Corrosion by SEAWATER at greater DEPTH is usually decreased because of the lower temperature. It decreases by 40°F for one-mile depth.

Discussion

65.	Which of the following regions of the seacoast environment shows the effect of the pitting of metals and alloys?(a) Quiet seawater(b) High tide region(c) Low tide region(d) Splash regionThis question was posed to me in class test.I'm obligated to ask this question of Environments in section Other Environments of Corrosion Engineering
Answer» Correct choice is (a) Quiet seawater For EXPLANATION I would say: Pitting is extremely localized corrosion which results in HOLES or cavities. Quiet seawater in the region of the SEACOAST environment that shows the effect of the pitting of metals and alloys. An increase in the velocity of a corrosive SOLUTION decreases the pitting tendency of a metal.

Discussion

66.	Which of the following impurities that causes corrosion difficulties in refinery operations?(a) Hydrogen sulfide and carbon dioxide(b) Hydrogen sulfide, carbon dioxide, sulfuric acid, and sodium chloride(c) Sodium carbonate and sodium silicate(d) Hydrogen sulfide and sulfuric acidThe question was asked in final exam.My query is from Environments in portion Other Environments of Corrosion Engineering
Answer» Correct choice is (b) Hydrogen sulfide, carbon DIOXIDE, sulfuric acid, and SODIUM chloride To explain: REFINERY of crude is done based on the difference in boiling points of the components present and the process is known as fractional distillation. Hydrogen sulfide, carbon dioxide, sulfuric acid, and sodium chloride are the IMPURITIES that cause difficulties in refinery operations.

Discussion

67.	Which of the following alloys is also called as weathering steels?(a) Low-alloy steels used for atmospheric applications(b) High-alloy steels used for atmospheric applications(c) Low-alloy copper alloys(d) Low-alloy aluminum alloysI have been asked this question during an online exam.My query is from Environments topic in portion Other Environments of Corrosion Engineering
Answer» RIGHT option is (a) Low-alloy STEELS used for atmospheric applications For EXPLANATION: Low-alloy steels used for atmospheric applications is also known as weathering steels. It is also used in weight-saving applications and to increase durability of paint coatings.

Discussion

68.	Which of the following statements is/are correct regarding caustic embrittlement?(a) Mild carbon steels are susceptible to caustic embrittlement(b) It occurs in concentrated hydroxide environment(c) It occurs around the rivets(d) Mild carbon steels are susceptible to caustic embrittlement in concentrated hydroxide environment around the rivetsThe question was asked in quiz.The doubt is from Environments topic in chapter Other Environments of Corrosion Engineering
Answer» RIGHT option is (d) Mild carbon steels are susceptible to caustic EMBRITTLEMENT in CONCENTRATED hydroxide environment AROUND the rivets The explanation is: i. Mild carbon steels are susceptible to caustic embrittlement ii. It occurs in concentrated hydroxide environment iii. It occurs around the rivets due to COLD working.

Discussion

69.	How many times that industrial corrosion is more corrosive than rural atmospheres?(a) 10 to 20(b) 50 to 100(c) 30 to 50(d) 100 to 150I have been asked this question by my college professor while I was bunking the class.My doubt stems from Environments in division Other Environments of Corrosion Engineering
Answer» The correct answer is (b) 50 to 100 To ELABORATE: Industrial corrosion is 50 to 100 times more CORROSIVE than desert areas. It is due to the presence of Sulphur burned gases such as SO2, SO3 and these results in the formation of SULFUROUS and sulfuric acids in the presence of moisture.

Discussion

70.	Which of the following metal results in stress corrosion cracking in an ammoniacal solution?(a) Aluminum and its alloys(b) Nickel and its alloys(c) Copper and its alloys(d) Stainless steelsThis question was addressed to me in a job interview.The doubt is from Environments in division Other Environments of Corrosion Engineering
Answer» Correct ANSWER is (C) COPPER and its ALLOYS For explanation: Copper and its alloys result in stress corrosion cracking in AMMONIACAL solutions. The decomposition of organic materials containing nitrogen has caused stress corrosion cracking.

Discussion

71.	Which of the following metals are widely used for atmospheric applications?(a) Copper and lead(b) Copper, lead, aluminum and galvanized steel(c) Galvanized steel only(d) Galvanized steel and copperI had been asked this question at a job interview.My doubt is from Environments topic in chapter Other Environments of Corrosion Engineering
Answer» The CORRECT option is (b) Copper, lead, aluminum and GALVANIZED steel The explanation is: Copper, lead, aluminum and galvanized steel are widely used for atmospheric corrosion APPLICATIONS. IMPROVING the corrosion RESISTANCE of steel with small alloy additions is now commonly used along with weight-saving applications.

Discussion

72.	Which of the following metal is prone to stress corrosion cracking in methanol?(a) Nickel(b) Copper(c) Titanium(d) Stainless steelThe question was asked in exam.Query is from Environments in portion Other Environments of Corrosion Engineering
Answer» The CORRECT answer is (c) Titanium Easy EXPLANATION: METHANOL is the DERIVATE of METHANE and it is also called methyl alcohol. The chemical of methanol is CH3OH. Titanium is prone to stress corrosion cracking in methanol with the presence of chloride impurities.

Discussion

73.	Which of the following metals will switch positions in acetic acid as the temperature gets increased?(a) Copper and stainless steel(b) Stainless steel and nickel(c) Steel and copper(d) Aluminum and nickelThis question was addressed to me during an interview for a job.Question is from Environments in section Other Environments of Corrosion Engineering
Answer» Correct OPTION is (a) Copper and stainless steel Explanation: Acetic acid exhibits unusual CORROSION behavior with an INCREASE in TEMPERATURE. Copper and stainless-steel switch positions as the temperature are increased. Copper shows little corrosion at high TEMPERATURES whereas stainless steels corrode rapidly and vice versa.

Discussion

74.	Which of the following metal is suitable under all conditions of concentration and temperature in caustic soda?(a) Nickel(b) Aluminum(c) Titanium(d) Carbon steelThis question was posed to me in unit test.The question is from Environments in portion Other Environments of Corrosion Engineering
Answer» Correct choice is (a) NICKEL Easy explanation: Nickel is suitable under all conditions of concentrations and temperatures in the caustic ENVIRONMENT. The corrosion resistance of material DIRECTLY PROPORTIONAL to the nickel content of an alloy.

Discussion

75.	Which of the following common alkalies that results in stress-corrosion cracking of steel?(a) Caustic soda(b) Caustic soda and caustic potash(c) Caustic potash(d) Sodium carbonateThis question was posed to me in an internship interview.This intriguing question comes from Environments in chapter Other Environments of Corrosion Engineering
Answer» Right option is (b) Caustic SODA and caustic potash The EXPLANATION: Caustic soda and caustic potash are the common alkalies that result in stress-corrosion CRACKING of steel. It USUALLY occurs in HIGH concentrations only.

Discussion

76.	Which of the following is/are used for ammoniacal solution applications?(a) Cast iron and steel(b) 430 and 304 type stainless steels(c) Cast iron, steel, 430 and 304 type stainless steels(d) Copper and cast ironsThe question was posed to me in semester exam.This is a very interesting question from Environments in section Other Environments of Corrosion Engineering
Answer» The correct answer is (c) Cast iron, steel, 430 and 304 TYPE stainless STEELS To elaborate: Ammonia and AMMONIACAL solutions generally do not present a difficult CORROSION problem. We usually use cast iron, steel, and 430, 304 type stainless steels for LOW and high temperatures respectively.

Discussion

77.	What are the parameters that affect the corrosion rate of metal in organic acids?(a) Solvent composition(b) The solubility of corrosion products(c) Oxygen solubility(d) Solvent composition, the solubility of corrosion products and oxygen solubilityI have been asked this question in an interview for internship.This question is from Environments topic in section Other Environments of Corrosion Engineering
Answer» Right ANSWER is (d) Solvent composition, the solubility of corrosion products and oxygen solubility The BEST explanation: Parameters that AFFECT the corrosion rate of METALS in organic ACIDS are: i. Solvent composition and structure ii. The solubility of corrosion products iii. Oxygen solubility.

Discussion

78.	Which of the following is the most corrosive organic acid?(a) Acetic acid(b) Formic acid(c) Ethanol(d) AcetoneThis question was posed to me in examination.My enquiry is from Environments in portion Other Environments of Corrosion Engineering
Answer» Correct option is (b) Formic acid To elaborate: Formic acid is one of the strongest and most CORROSIVE organic acids. It mainly results in stress-corrosion CRACKING of various metals at various CONDITIONS. The chemical FORMULA of formic acid is HCOOH.

Discussion

79.	What is meant by caustic embrittlement?(a) Decrease in compressive strength due to caustic accumulation(b) The phenomenon of metal to become brittle due to caustic accumulation at the rivets(c) Entrapment of caustic content between atoms to cause brittleness(d) The phenomenon of metal to become more tensile due to caustic accumulationThe question was posed to me during an interview.This intriguing question comes from Environments in division Other Environments of Corrosion Engineering
Answer» Correct OPTION is (b) The PHENOMENON of METAL to become brittle due to caustic accumulation at the rivets Easy explanation: Caustic embrittlement is the phenomenon of metal to become brittle due to caustic accumulation at the rivets. The cold working of rivets is the main reason for caustic embrittlement.

Discussion

80.	Which of the following is/are the preventions of caustic embrittlement?(a) Optimize stress concentration(b) Avoid caustic environment(c) Use of nickel-based alloys, avoid caustic environment and optimize stress concentration(d) Use mild carbon steelsThe question was asked during an interview for a job.My question is taken from Environments in chapter Other Environments of Corrosion Engineering
Answer» The CORRECT option is (c) Use of nickel-based alloys, avoid CAUSTIC ENVIRONMENT and optimize stress concentration To elaborate: Preventions of caustic embrittlement are: i. Optimize stress concentration ii. Avoid caustic environment iii. Use of nickel-based alloys.

Discussion

81.	Aluminum is a very poor resistant material for handling caustic environments and rapidly attacked even by dilute solutions.(a) False(b) TrueThis question was addressed to me in an interview.The question is from Environments topic in section Other Environments of Corrosion Engineering
Answer» Correct option is (b) True Explanation: Aluminum is a very POOR resistant material for handling caustic environments and rapidly attacked even by dilute solutions. But it is adopted in an ammoniacal environment such as REFRIGERATION systems and storage TANKS.

Discussion

82.	Which of the following is/are the corrosion prevention methods in organic acids?(a) Selection of materials and drying(b) Selection of materials, drying, deaeration, and neutralization of the solvent(c) Deaeration and neutralization of the solvent(d) Drying and deaerationThis question was posed to me in final exam.This intriguing question comes from Environments in chapter Other Environments of Corrosion Engineering
Answer» The correct OPTION is (B) Selection of materials, drying, DEAERATION, and neutralization of the solvent The EXPLANATION is: Corrosion prevention methods in ORGANIC acids: i. Selection of materials ii. Drying iii. Deaeration iv. Neutralization of the solvent.

Discussion

83.	Organic acids are relatively weaker than the inorganic acids because they are slightly ionized.(a) True(b) FalseI have been asked this question in an interview for job.This intriguing question comes from Environments in division Other Environments of Corrosion Engineering
Answer» The correct answer is (a) True The best explanation: ORGANIC acids are relatively weaker than the INORGANIC acids because they are slightly IONIZED. The relatively HIGH degree of ionization of inorganic acid RESULTS in greater electrochemical corrosion of metal.

Discussion

84.	Oxygen is the primary cause of cracking in ammoniacal solution rather than nitrogen.(a) True(b) FalseI had been asked this question during an interview.Asked question is from Environments topic in portion Other Environments of Corrosion Engineering
Answer» Correct answer is (a) True For explanation: Oxygen is the primary cause of cracking, with as little as 0.01 PPM REQUIRED in the ammoniacal SOLUTION. A slip STEP or film rupture is a MECHANICAL method of this cracking.

Discussion

85.	Which of the following can be used to inhibit stress corrosion cracking in ammoniacal solutions?(a) Addition of 0.2% water(b) Addition of 0.025% hydrazine in refrigeration(c) Addition of oxidizing agents(d) Either addition of 0.2% water or addition of 0.025% hydrazine in refrigerationI got this question during an internship interview.Question is taken from Environments topic in division Other Environments of Corrosion Engineering
Answer» The correct CHOICE is (d) Either addition of 0.2% water or addition of 0.025% hydrazine in refrigeration Explanation: OXYGEN and oxidizing AGENTS are the primary cause of stress CORROSION cracking in ammoniacal SOLUTIONS. It can be inhibited by the addition of 0.25% of water or the addition of 0.025% hydrazine in refrigeration.

Discussion

86.	Corrosion of steel on the seacoast is 400 to 500 times is more corrosive than in a desert area.(a) True(b) FalseThis question was posed to me in examination.Enquiry is from Environments topic in division Other Environments of Corrosion Engineering
Answer» CORRECT choice is (a) True Explanation: Corrosion of steel on the seacoast is 400 to 500 times is more corrosive than in a desert area. This due to the contamination of ATMOSPHERE with sodium chloride and other impurities at the seacoast.

Discussion

87.	Which of the following metals will have high corrosion rates in aerated acetic acid?(a) Aluminum and its alloys(b) Copper and its alloys(c) Titanium and its alloys(d) Nickel and its alloysThis question was posed to me in final exam.I'm obligated to ask this question of Environments in chapter Other Environments of Corrosion Engineering
Answer» Right OPTION is (b) Copper and its alloys Explanation: Copper and its alloys will be HIGHLY affected by AERATION (oxygen) in acetic acid and it INCREASES with an increase in temperature. It can be prevented by DEAERATION and decrease in temperature.

Discussion

88.	Which of the following alloying elements increase resistance of steel to atmospheric corrosion?(a) Copper(b) Nickel(c) Chromium(d) Copper, nickel and chromiumThe question was posed to me at a job interview.My query is from Environments topic in section Other Environments of Corrosion Engineering
Answer» The correct choice is (d) Copper, nickel and chromium The explanation: Steel is the most widely USED METAL for various metallic structures in all atmospheres. The resistance of steel can be IMPROVED by alloying elements such as copper, nickel and chromium. This is due to formation of stable, thick and ADHERENT protective FILM.

Discussion

89.	The application of electrochemical protection methods in organic acids is restricted due to low electrical conductivity.(a) True(b) FalseI have been asked this question in an interview.The query is from Environments in section Other Environments of Corrosion Engineering
Answer» Right CHOICE is (a) True Best explanation: Application of electrochemical protection methods in organic acids is restricted due to low ELECTRICAL conductivity. As we know cathodic and ANODIC protection is based on electrical CONDUCTIVITIES of metallic structure and MEDIUM.

Discussion

90.	Which of the following is/are the reasons for more corrosiveness of industrial atmosphere than rural atmosphere?(a) Formation of sulfurous and sulfuric acid(b) Ejection of corrosive ammoniacal solutions(c) Formation of sulfurous and sulfuric acid and ejection of corrosive ammoniacal solutions(d) High levels of carbon dioxideThe question was posed to me in exam.The origin of the question is Environments topic in division Other Environments of Corrosion Engineering
Answer» The CORRECT option is (C) Formation of sulfurous and SULFURIC acid and ejection of corrosive ammoniacal solutions Easiest explanation: Formation of sulfurous and sulfuric acid from sulfur burning gases and ejection of corrosive ammoniacal solutions are the reasons of industrial corrosion. Whereas CARBON DIOXIDE is not corrosive in nature.

Discussion

91.	Which of the following materials is/are used for handling acetic acid?(a) Type 316 and 304 Stainless steels(b) Copper and Bronzes(c) Duriron and Hastelloy C(d) Hastelloy C, Durimet 20, Duriron, Copper, Bronzes and 316 and 304 stainless steelsI have been asked this question in quiz.This intriguing question originated from Environments in portion Other Environments of Corrosion Engineering
Answer» The correct option is (d) Hastelloy C, Durimet 20, DURIRON, Copper, Bronzes and 316 and 304 stainless steels The best I can explain: Acetic acid is the most important organic acid from the standpoint of QUANTITY produced. Hastelloy C, Durimet 20, Duriron, Copper, Bronzes, and 316 and 304 stainless steels are widely USED for handling acetic acid.

Discussion

92.	Which of the following is/are the primary causes of atmospheric corrosion?(a) Moisture(b) Oxygen(c) Moisture, oxygen and sulfur contaminants(d) Sulfur contaminants onlyI have been asked this question in an interview for job.The doubt is from Environments topic in division Other Environments of Corrosion Engineering
Answer» The CORRECT option is (C) MOISTURE, oxygen and sulfur CONTAMINANTS For explanation: The primary causes of atmospheric corrosion is moisture, oxygen and sulfur contaminants. ABSENCE of either moisture or oxygen in at least form will result in no corrosion.

Discussion

93.	Which of the following is/are the classifications of atmospheres regarding atmospheric corrosion?(a) Industrial(b) Marine(c) Rural(d) Industrial, marine and ruralThis question was addressed to me in an interview for internship.Enquiry is from Environments topic in section Other Environments of Corrosion Engineering
Answer» Right choice is (d) Industrial, MARINE and RURAL Explanation: Atmospheric CORROSION can be defined as the corrosion of metals in surrounding corrosive environment. It can be classified into three types NAMELY industrial, marine and rural atmospheres.

Discussion

94.	Which of the following impurities that affect the corrosion rate of carbon steel in benzene solvent?(a) Oxygen(b) Butyric acid(c) Oxygen and butyric acid(d) Zinc dustI got this question in a job interview.My question comes from Environments topic in division Other Environments of Corrosion Engineering
Answer» Right answer is (C) Oxygen and BUTYRIC acid Explanation: Oxygen and butyric acid are the impurities that affect the corrosion rate of carbon steel in benzene SOLVENT. It can be PREVENTED by ELIMINATING oxygen.

Discussion

Explore topic-wise InterviewSolutions in .

Rusting of high-strength steel due to resident water can cause stress-corrosion and hydrogen embrittlement.(a) False(b) TrueThis question was posed to me in homework.I need to ask this question from Environments topic in portion Other Environments of Corrosion Engineering

Which of the following metals have high resistance to crevices in quiet seawater?(a) Hastelloy C(b) Titanium(c) Hastelloy C and Titanium(d) Nickel-copper alloyThe question was asked in semester exam.This question is from Environments topic in section Other Environments of Corrosion Engineering

Corrosion decreases with an increase in the purity of water.(a) True(b) FalseI have been asked this question during an online exam.I'd like to ask this question from Environments in portion Other Environments of Corrosion Engineering

Corrosion by seawater at greater depth is usually decreased because of the lower temperature.(a) False(b) TrueI had been asked this question in my homework.I would like to ask this question from Environments in division Other Environments of Corrosion Engineering

Which of the following metal is prone to stress corrosion cracking in methanol?(a) Nickel(b) Copper(c) Titanium(d) Stainless steelThe question was asked in exam.Query is from Environments in portion Other Environments of Corrosion Engineering

Which of the following metal is suitable under all conditions of concentration and temperature in caustic soda?(a) Nickel(b) Aluminum(c) Titanium(d) Carbon steelThis question was posed to me in unit test.The question is from Environments in portion Other Environments of Corrosion Engineering

Which of the following is the most corrosive organic acid?(a) Acetic acid(b) Formic acid(c) Ethanol(d) AcetoneThis question was posed to me in examination.My enquiry is from Environments in portion Other Environments of Corrosion Engineering

Aluminum is a very poor resistant material for handling caustic environments and rapidly attacked even by dilute solutions.(a) False(b) TrueThis question was addressed to me in an interview.The question is from Environments topic in section Other Environments of Corrosion Engineering

Organic acids are relatively weaker than the inorganic acids because they are slightly ionized.(a) True(b) FalseI have been asked this question in an interview for job.This intriguing question comes from Environments in division Other Environments of Corrosion Engineering

Oxygen is the primary cause of cracking in ammoniacal solution rather than nitrogen.(a) True(b) FalseI had been asked this question during an interview.Asked question is from Environments topic in portion Other Environments of Corrosion Engineering

Corrosion of steel on the seacoast is 400 to 500 times is more corrosive than in a desert area.(a) True(b) FalseThis question was posed to me in examination.Enquiry is from Environments topic in division Other Environments of Corrosion Engineering

Which of the following alloying elements increase resistance of steel to atmospheric corrosion?(a) Copper(b) Nickel(c) Chromium(d) Copper, nickel and chromiumThe question was posed to me at a job interview.My query is from Environments topic in section Other Environments of Corrosion Engineering

The application of electrochemical protection methods in organic acids is restricted due to low electrical conductivity.(a) True(b) FalseI have been asked this question in an interview.The query is from Environments in section Other Environments of Corrosion Engineering