Effect of Surface Roughness on the Corrosion Behavior of 304 Stainless Steel in Seawater

期刊论文
发表日期：

2024年12月5日

查看全文

Xuehui Liu,
Huixia Zhang,
Hongtao Tong,
Yongqiang Sui,
Xiangbo Li,
Jian Hou

摘要

In this paper, three different average surface roughness (R_a ) (0.023 μm, 0.143 μm and 0.334 μm) were used to study the effect of surface roughness on the pitting behavior of 304 stainless steel. It was characterized by electrochemical and surface analytical methods. The specimen with R_a of 0.023 μm showed higher corrosion resistance. With the increase of R_a, the pitting potential (E_p) decreased linearly, while the donor density (N_D) of passive film on the surface of 304 stainless steel increased linearly. The smooth surface of 304 SS reduced the risk of pitting corrosion by increasing the Cr/Fe atomic ratio in the passive film. Accordingly, the pitting corrosion resistance was enhanced as surface roughness decreased.