The pitting and intergranular corrosion resistance of 304L and 321 austenitic stainless steel plates were analyzed by electrochemical and chemical immersion methods. The results show that the breakdown potential Eb of 304L is higher, and Eb-Ep is larger. The pitting corrosion resistance of 304L is stronger than that of 321, but the repairing ability of passivation film is weaker than that of 321. In the intergranular corrosion immersion test, the 321 grain boundary corrosion is deep, delineating the complete grain boundary, while the grain boundary corrosion of 304L stainless steel is generally slight, which does not see the complete grain boundary contour, which indicates that 304L is resistant to intergranular Can replace 321 stainless steel when used in corrosive fields.
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