纳米Fe-10Cr涂层电化学腐蚀行为影响研究 Ⅱ.点蚀性能  

CORROSION BEHAVIOR OF Fe-10Cr NANOCRYSTALLINE COATINGS Ⅱ.CORROSION BEHAVIOR OF Fe-10Cr NANOCRYSTALLINE COATINGS IN ACIDIC SOLUTION WITH Cl^-

作　　者：孟国哲 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》2007年第1期43-47,共5页Journal of Chinese Society For Corrosion and Protection

基　　金：国家自然科学基金项目(50001013)

摘　　要：利用动电位极化曲线、电化学阻抗谱图(EIS)和Mott-Schottky分析等电化学测试手段,探讨了Fe-10Cr纳米涂层在0.05 mol/L H2SO4+0.5 mol/L NaC l溶液中的腐蚀行为.研究表明,与铸态合金相比,溅射纳米涂层表面钝化膜的化学稳定性和再钝化性能明显提高;二者的钝化膜均具有p型半导体结构特征,但溅射纳米涂层表面钝化膜的载流子密度和平带电位都比较低,导致钝化膜中金属离子的传输速度较低,纳米涂层表面钝化膜的化学稳定性增强.The corrosion behavior of Fe - 10Cr sputtering coating with nanoscale grain size was investigated in 0.05 mol/L H2SO4 ＋0.5 mol/L NaCl aqueous solution using polarization curves, EIS and Mott -Schottky analysis. The results indicated that the chemical stability and repassive ability of passive film formed on Fe - 10Cr nc coating was apparently improved. The passive films on both Fe - 10Cr nc coating and cast alloy have p - type semiconducting behavior. The lower acceptor density and flat - band potential of the passive film in comparison with Fe - 10Cr cast alloy lead to the high chemical stability and repassive ability for the passive film on the sputtering coating.

关 键 词：纳米晶 晶粒尺寸 腐蚀行为 钝化 钝化膜 点蚀 

分 类 号：TG171[金属学及工艺—金属表面处理]