摘要
研制了两种新型铝合金阳极材料 ;用恒电流方法和动电位方法测定了铝合金阳极在碱性氯化钠 (2 5 %KOH + 3.5 %NaCl)介质中的电化学性能 ;用金相显微镜、扫描电子显微镜观察了新型铝合金的微观组织和阳极溶解后的表面腐蚀状态。结果表明 :固溶于铝基体的微量合金化元素Ga、In及其适量均匀分布的第二相 ,可以破坏铝氧化膜的致密结构 ,促使铝基体的正常溶解 ,减少铝阳极极化 ,使铝合金阳极的稳定电极电位变得更负 ;加入能改变铝基体中杂质的存在状态和降低杂质含量的合金化元素Mg等 ,可以改善铝阳极的腐蚀均匀性 ,降低自腐蚀速度 。
Two types of new aluminum alloys were developed as sacrificial anode material. The electrochemical properties, microstructure and surface corrosion morphology of the aluminum alloy anode in alkaline NaCl solution (25%KOH + 3.5%NaCl) were determined by electrochemical methods, metalloscope and SEM. Results showed that the electrochemical properties of Al alloy anode was depended on the microstructure. Breakdown of oxidation film, acceleration of dissolution, decrease of anodic polarization and negative increase of potential occurred owing to the second phase and concentrating of alloy elements. The impurity tolerance, electrochemistry properties and surface corrosion uniformity of anode material were improved with trace elements solid-melted in matrix and well-distributed second phase. Corrosion rate of alloy was so low that availability of anode was increased.
出处
《材料保护》
CAS
CSCD
北大核心
2002年第5期10-12,共3页
Materials Protection
