单相和双相不锈钢纳米涂层的电化学腐蚀行为  

ELECTROCHEMICAL CORROSION BEHAVIOR OF NANO-CRYSTALLINE STAINLESS STEEL COATING WITH DIFFERENT PHASE COMPOSITION

作　　者：叶威[1] 李瑛[1] 王福会[1] 

机构地区：[1]中国科学院金属研究所金属腐蚀与防护国家重点实验室,沈阳110016

出　　处：《中国腐蚀与防护学报》2008年第3期129-134,共6页Journal of Chinese Society For Corrosion and Protection

基　　金：国家自然科学基金项目(50671113)

摘　　要：用磁控溅射技术在玻璃基体上制备由两种相组成(单相和双相)的不锈钢纳米涂层,利用动电位极化、交流阻抗技术及扫描电子显微镜研究两种不锈钢纳米涂层在0.25 mol/L Na2SO4+0.05 mol/L H2SO4和0.5 mol/L NaCl+0.05 mol/L H2SO4溶液中的电化学腐蚀行为,观察相组成对纳米不锈钢涂层耐蚀性能的影响。结果表明,与不锈钢单相涂层相比,不锈钢双相纳米涂层具有较差的抗局部腐蚀能力,其钝化膜的载流子密度远远大于不锈钢单相钝化膜的载流子密度,使得钝化膜的离子传输能力大大增强,从而降低了钝化膜的稳定性。The single-phase （α） and dual-phase （α＋γ） nano-crystalline coatings have been fabricated on glass substrate by DC magnetron sputtering. The electrochemical corrosion behavior of the two nano-crystalline coatings in 0.25 mol/L Na2SO4 ＋ 0.05 mol/L H2SO4 and 0.5 mol/L NaCl ＋ 0.05 mol/L H2SO4 solutions was investigated by using potentiodynamic polarization, EIS and SEM. The results showed that there was a large difference in the corrosion behavior between the single-phase （α） and the dual-phase （α＋γ） nano-crystalline coatings. The dual-phase coating is shown to have exhibited a lower localized corrosion resistance and possessed a less stable passive film than the single-phase coating. A similar two-layer semiconductor passive film was formed on both coatings; however, a great increase in carrier densities could be responsible for the low stability of the passive film on the dual-phase coating.

关 键 词：纳米涂层 相组成 局部腐蚀 钝化膜 

分 类 号：TG172[金属学及工艺—金属表面处理]