材料科学与工程学报2018，Vol.36Issue(1)：121-124,157,5.DOI:10.14136/j.cnki.issn1673-2812.2018.01.026
AM355不锈钢在酸性溶液中的腐蚀电化学行为
Electrochemical Corrosion Behavior of AM355 Stainless Steel in Acid Solution
摘要
Abstract
Effect of pH value on the electrochemical corrosion behaviors of AM355 stainless steel was investigated by means of polarization,electrochemical impedance spectroscopy(EIS),Mott-Schottky(MS) and scanning electron microscope (SEM).Results show that both of the corrosion potential and the initiating passive potential move toward positive direction as pH decreases.Additionally,the current densities of corrosion,passivity-initiating and passivity-maintaining increase simultaneously.The passive film is composed of Cr and Fe oxides.The decrease of pH leads to the increment of both donor density of Fe oxide and the H+ absorption density on the film surface.The thickness and the resistance of passive film reduce as pH declines.The passive film will be locally destroyed when the pH decrease to a certain extent.In the high concentration acid solution,the passive film is more easily destroyed and the self-passivation ability is weakened,thereby the steel corrosion rate accelerates.关键词
AM355不锈钢/pH/腐蚀电化学Key words
stainless steel AM355/pH/electrochemical corrosion分类
矿业与冶金引用本文复制引用
范春华,李国祥,李雪莹,刘伯洋,吴钱林,尹衍升..AM355不锈钢在酸性溶液中的腐蚀电化学行为[J].材料科学与工程学报,2018,36(1):121-124,157,5.基金项目
973项目资助项目(2014CB643306) （2014CB643306）
