纳米Fe-10Cr涂层电化学腐蚀行为影响研究 I.钝化性能  

CORROSION BEHAVIOR OF Fe-10Cr NANOCRYSTALLINE COATINGS (I) THE PASSIVE BEHAVIOR OF Fe-10Cr NANOCRYSTALLINE COATINGS IN ACIDIC SOLUTION

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35-42,共8页Journal of Chinese Society For Corrosion and Protection

基　　金：国家自然科学基金项目(50001013)

摘　　要：利用磁控溅射技术制备出了晶粒尺寸为20 nm-30 nm的Fe-10Cr合金涂层.通过动电位极化曲线、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+0.25mol/L Na2SO4溶液中的钝化性能。发现纳米化使材料的活性溶解增强;在钝化膜形成过程中Cr更容易富集,从而更容易钝化;纳米化后,材料表面钝化膜中的载流子密度下降,化学稳定性提高.Fe - 10Cr nanocrystalline （ nc ） coating with the grain size about 20 nm to 30 nm was fabricated on a glass substrate by magnetron sputtering technique. The corrosion behavior of the Fe - 10Cr nc coating and its counterpart alloys were investigated in 0.05 mol/L H2SO4 ＋0.25 mol/L Na2SO4 solution by polarization curves. The resuits showed that the active dissolution of Fe - 10Cr nc coating was accelerated as comparing with its counterpart Fe - 10Cr cast alloy. For Fe - 10Cr nc coating,it had a higher tendency to passive in acid solution and the passive current density was lower as compaed with its counterpart ahoy. The further average active energy measurement, EIS measurement and Mott -Schottky analysis revealed that the average active energy for the dissolving reaction of the Fe- 10Cr nc coating was higher. This is attributed to the higher defect density on the nc coating. On the other hand,even though the same n type semiconductor passive film was formed on both nc sputtering coating and its counterpart alloy,but Cr was easier to accumulate in the passive film of Fe - 10Cr nc coating and the donor density in its passive film was lower. The higher passive ability of the nc sputtering coating was attributed to the more Cr accumulated in the passive film and the higher chemical stability of the passivity film.

关 键 词：纳米晶 晶粒尺寸 腐蚀行为 钝化 钝化随 

分 类 号：TG171[金属学及工艺—金属表面处理]