Study on Intergranular Corrosion of Sensitized 316L Stainless Steel

The results of experimental study on intergranular corrosion of sensitized 316L stainless steel by mass loss measurement and metallographic inspection method through boiling nitric acid experiments show that: the intergranular corrosion behavior of sensitized 316L stainless steel is mainly divided into three stages: initiation stage, stable stage and rapid development stage, the corrosion rate added with the experimental time extension; the degree of intergranular corrosion has a direct relationship with material grain size, large grain regions have a small degree of intergranular corrosion; and small grain regions have a large degree of intergranular corrosion, even leading to pitting corrosion.