AISI304不锈钢钝化膜在电解质溶液中腐蚀时的半导体性质  

Semiconductor Characters of Passive Film on AISI304 Stainless Steel Surface in Electrolytes during Corrosion Process

作　　者：王超[1] 支玉明[2] 盛敏奇[1] 钟庆东[1] 周国治[1,3] 鲁雄刚[1] 褚于良[4] 

机构地区：[1]上海大学现代冶金与材料制备重点实验室,上海200072 [2]宝山钢铁股份有限公司,上海201900 [3]北京科技大学冶金与生态工程学院,北京100083 [4]上海大学分析测试中心,上海200444

出　　处：《腐蚀与防护》2009年第6期369-372,431,共5页Corrosion & Protection

基　　金：国家自然科学基金(GrantNo.50571059;50615024);2007教育部新世纪优秀人才支持计划项目(NCET-07-0536);教育部创新团队IRT0739项目资助。

摘　　要：应用电位-电容测试和Mott-Schottky分析技术研究了AISI304不锈钢钝化膜在电解质溶液中的半导体性质。结果表明,不锈钢钝化膜在氢氧化钠溶液中,随着浸泡时间延长,半导体类型转变电位发生负移;在硫酸、硫酸钠两种溶液中转变电位无明显变化。随着腐蚀时间的延长,溶液中不锈钢钝化膜的载流子密度逐渐增加,其载流子密度在几种溶液中从小到大的顺序依次为硫酸钠,氢氧化钠,硫酸。不锈钢在三种溶液中的Mott-Schottky曲线均出现频率分化,其原因可能为钝化膜中载流子的产生-复合存在时间效应;在氢氧化钠溶液中,钝化膜腐蚀的主要原因为富铬层导电能力增强;在硫酸、硫酸钠两种溶液中,钝化膜腐蚀的主要原因为富铁层导电能力的增强。The semiconductor characters of AISI304 stainless steel＇s passive film during corrosion process in three typical electrolytes were investigated by using potential-capacitance measurement and Mott-Schottky analysis. Passive film on the surface of the stainless steel was constructed from two different types of semiconductor film in electrolytes under study. In sodium hydroxide, the semiconductor-type-transition potential had an obvious negative drifting, while in the other two electrolytes, the transition potential had no obvious change with immersion time. Charge carrier density in the passive film increased with immersion time. The charge carrier density at 1000Hz in these three solutions could be listed in an ascending order of sodium sulfate, sodium hydroxide and sulfuric acid. Frequency dependence, appeared in all Mott-Schottky plots of AISI304 stainless steel＇s passive film, could be attributed to the time effect in generation-recombination process of charge carriers. The main cause of passive film＇s corrosion on the stainless steel surface in sodium hydroxide solution was the rising conductibility of chromium-rich layer, while in the other two solutions it was due to the ascending conductance of iron-rich layer.

关 键 词：Mott-Schottky分析 不锈钢 腐蚀 载流子 时间效应 导电能力 

分 类 号：TG172.6[金属学及工艺—金属表面处理]