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Which of the following areas is/are corroded in the intergranular corrosion of stainless steel?

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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 boundary

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This intriguing question originated from Eight Forms topic in division Eight Forms of Corrosion of Corrosion Engineering

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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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