Galvanic effects on electrochemical behaviors of bare surface of 304 stainless steel

来源期刊：中国有色金属学报(英文版)2000年第2期

论文作者：孙冬柏 李涛 俞宏英 杨德钧

文章页码：253 - 256

Key words：stainless steel; alloy; galvanic effect; electrochemistry

Abstract: The bare surface of 304 stainless steel is produced by the fast fracture method. The influence of the surface galvanic cell on the electrochemical behaviors of bare surface of 304 stainless steel has been investigated in H2SO4solutions with different concentrations. The results show that the solution corrosivity level and the area ratio influence the surface galvanic effects caused by the inhomogeneity between the free-film surface of alloy and the passive surface. The surface galvanic effects can speed up the dissolution rate of the bare surface of the alloy and will change the electrochemical behavior of bare surface. With the increase of the area ratio between passive surface and fractured surface, the galvanic potential becomes more positive and, in the range of passive potential, both galvanic current and the peak fracture current increase evidently.