摘要
用强制改变304不锈钢表面点蚀产物浓度的方法研究了点蚀产物浓度在亚稳态蚀孔的萌生过程及稳态蚀孔生长过程中的加速作用。结果表明,随着304不锈钢试样表面点蚀产物浓度的降低,点蚀孕育期增加,恒电位极化的平均峰值电流和平均峰值宽度显著减少,蚀孔数量显著减少,稳态蚀孔的体积、蚀孔横向生长速度下降。随着蚀孔宽深比的下降和蚀孔的生长,蚀孔内点蚀产物浓度再次增加,腐蚀速率增大。点蚀产物浓度是亚稳态蚀孔萌生和稳态蚀孔生长的关键因素。
The acceleration effect of the concentration of pitting corrosion products on the metastable pitting initiation and the stable pitting growth of 304 stainless steel was studied by changing the concentration of pitting products on the surface of 304 stainless steel compulsively. There are three characteristic indexes of metastable pitting initiation process with the decreasing concentration of pitting products, namely the increase of pitting incubation period, the reduce of average peak current and average peak width, and the decrease of pits number. The volume and the transverse growth rate of pits decreases. With the decreasing ratio of pits width to depth and the growth of pits, the concentration of pitting products in pits increases again and the corrosion rate increases. The concentration of pitting products is certainly the key factor for metastable pitting initiation and steady pitting growth.
作者
王标
杜楠
张浩
王帅星
赵晴
WANG Biao;DU Nan;ZHANG Hao;WANG Shuaixing;ZHAO Qing(National Defense Key Discipline Laboratory of Alloy Processing Scienceand Technology, Nanchang Hangkong University, Nanchang 330063, China)
出处
《中国腐蚀与防护学报》
CAS
CSCD
北大核心
2019年第4期338-344,共7页
Journal of Chinese Society For Corrosion and Protection
基金
国家自然科学基金(51561024)~~
关键词
亚稳态点蚀
稳态点蚀
搅拌
恒电位极化
metastable pitting
stable pitting
stir
potentiostatic polarization
