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What is the molecular formula of chromium carbide formed due to the depletion of chromium in 18-8 stainless steel?

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What is the molecular formula of chromium carbide formed due to the depletion of chromium in 18-8 stainless steel?

(a) Cr3C

(b) Cr5C3

(c) CrC

(d) Cr23C6

This question was posed to me by my college professor while I was bunking the class.

My enquiry is from Eight Forms topic in chapter Eight Forms of Corrosion of Corrosion Engineering

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Right answer is (d) Cr23C6

To elaborate: Intergranular corrosion in 18-8 stainless steel is due to the depletion of chromium content at the grain boundary. This results in the formation of chromium carbide (Cr23C6) at the grain boundary. Chromium depleted zone is highly prone to corrosion and it is known as intergranular corrosion.

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