Intergranular corrosion of stainless steel
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Can stainless steel not be repaired after intergranular corrosion?
Repair it with a metal patch and conduct some experiments
Intergranular corrosion in stainless steel is generally caused by heat treatment or cold working; the corrosion progresses from the surface along the grain boundaries inward. The only solution for this issue is solution quenching, while repairs merely provide temporary relief