AZ91D合金的阳极氧化新工艺  

THE NEW TECHNOLOGY OF THE ANODIC OXIDATION APPLIED TO AZ91D ALLOY

作　　者：王赫男[1] 霍宏伟[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》2003年第5期286-289,共4页Journal of Chinese Society For Corrosion and Protection

基　　金：国家杰出青年基金 (5 96 2 5 10 3)

摘　　要：研制了一种新型镁合金的无Cr阳极氧化配方 ,对镁合金进行阳极化处理 .溶液的主要成分为NaOH、NaSiF6和有机添加剂 .XRD、SEM、XPS测试结果表明 ,氧化膜主要由MgO、MgAl2 O4 和 2Al2 O3 ·2SiO2 ·H2 O组成 .3 5 %NaCl水溶液动电位极化结果说明 ,氧化膜有良好耐点蚀性能 .合金中Si、Al元素的氧化弥补了Mg氧化时的体积收缩 ,氧化膜无裂纹 ,为其耐点蚀提供了条件 .阳极化后Al、Si元素在表面均匀分布 ,是氧化膜具有良好保护作用的原因之一 .A suitable mixture without chromium is developed for protection of magnesium alloys by treatment with the anodic oxidation.The aqueous solution is composed of NaOH、Na 2SiF 6 and an organic additive.The potentiodynamic polarization measurement showed that the film had outstanding protective ability in 3.5% NaCl solution.The morphology and component of the anodic oxidation film have been analysed by SEM,XRD,XPS and EPMA respectively.XRD and EPMA analysis revealed that the film was made of MgO、MgAl 2O 4 and 2Al 2O 3·2SiO 2·H 2O.Si and Al oxides make up the volume shrinkage of magnesium oxides,so that the film has no crack which provides a good condition against pitting.And the even dispersions of Si and Al in the film is another factor that the film has better protection.

关 键 词：镁合金 阳极氧化 耐蚀性 有机添加剂 氧化膜 

分 类 号：TG174.1[金属学及工艺—金属表面处理]