铝阳极氧化膜在氯化钠溶液中的孔蚀行为(Ⅱ)──膜层的极化行为与孔蚀形貌  

The Pitting Behavior of Anodized Aluminum in NaC1 Solution Part 2. The Polarization Behavior and the Pitting Morphology

作　　者：冯斌[1] 曾凌三[2] 旷亚非[2] 

机构地区：[1]湖南省电力试验研究所,长沙410007 [2]湖南大学化学化工学院,长沙410082

出　　处：《表面技术》2000年第1期25-28,共4页Surface Technology

基　　金：科贝尔科学基金

摘　　要：采用动态恒电位极化曲线方法，结合金相分析对铝硫酸阳极氧化膜 在ＮａＣ１溶液中的孔蚀行为机理进行了研究初探，实验表明：铝经硫酸阳极氧化处 理后具有较高耐孔蚀性能，这是由于它表面生成了一层由阻挡层与多孔层所构成 的特殊双层结构所引起。阻挡层使孔蚀形核、长大需要更高的能量，而多孔层由于 受孔的大小、深度的影响，使Ｃ１－离子与腐蚀产物扩散困难，引起小孔的再钝化，孔 蚀电位正移。The pitting behavior of the anodized aluminum(with or without reversed field treatment)has been studied using potentiostatic polarization method. After anodized in H2SO4 solution, aluminum showed improved pitting resistance in NaC1 solution due to the formation of the special two--layer oxide film which composed by the barrier layer and the porous layer on the surface. The nucleaton and the growth rate of the pits were significantly affected by the barrier layer while the porous layer made the corrosive CI-- anion and the corrosion product migrate in the pore difficult thus caused the pits repassivation and shifted the potential towards noble.

关 键 词：孔蚀 阳极氧化膜 极化曲线 铝 氯化钠溶液 

分 类 号：TG174.63[金属学及工艺—金属表面处理] TG153.6[金属学及工艺—金属学]