Which of the following areas is/are corroded in the intergranular corrosion of stainless steel?(a) Grain only(b) Grain boundary only(c) Chromium depleted zone near the grain boundary(d) Both grain and grain boundaryThis question was posed to me in quiz.This intriguing question originated from Eight Forms topic in division Eight Forms of Corrosion of Corrosion Engineering

Which of the following areas is/are corroded in the intergranular corr

1.	Which of the following areas is/are corroded in the intergranular corrosion of stainless steel?(a) Grain only(b) Grain boundary only(c) Chromium depleted zone near the grain boundary(d) Both grain and grain boundaryThis question was posed to me in quiz.This intriguing question originated from Eight Forms topic in division Eight Forms of Corrosion of Corrosion Engineering
Answer» The correct option is (c) CHROMIUM depleted zone NEAR the grain boundary Explanation: !8-8 stainless steel is SUSCEPTIBLE to intergranular corrosion due to sensitization in the temperature of 950 to 1450°F. At this stage, chromium reacts with CARBON near the grain boundary and RESULTS in the formation of the chromium depleted zone. This chromium depleted zone is prone to intergranular corrosion.

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