摘要
采用微弧氧化技术对粉末冶金制备的2A12铝合金进行表面改性,表征改性层微观结构和相组成,评价改性后2A12铝合金的电化学腐蚀性能。研究发现:微弧氧化处理之后,2A12铝合金表面生成厚度约为80μm的均匀氧化膜,其主要由α-Al2O3、γ-Al2O3及非晶组织构成;采用微弧氧化对2A12铝合金表面改性之后,改性层极大程度地抑制合金表面阳极反应和阴极反应的进行,自腐蚀电流密度明显下降,腐蚀速率显著降低,合金电化学腐蚀性能明显提高。
The surface of 2A12 aluminium alloy fabricated by powder metallurgy has been modified by microarc oxidation.The microstructure and phase composition of the modified layer have been characterized,and the electrochemical corrosion performance of 2A12 aluminium alloy after surface modification has been evaluated.It is found that a uniform oxidized film with the depth of about 80μm is formed on 2A12 aluminium alloy,which consists of α-Al2O3,γ-Al2O3 and amorphous structure.After surface modification by microarc oxidation,the modified layer on 2A12 aluminium alloy greatly inhibits the anodic and cathodic reactions of the alloy surface,and the corrosion current density and corrosion rate significantly decrease,suggesting the electrochemical corrosion performance of the alloy is obviously improved.
作者
刘竝
LIU Bing(School of Materials Science and Engineering,Central South University,Changsha 410083,China)
出处
《失效分析与预防》
2020年第5期305-311,318,共8页
Failure Analysis and Prevention
关键词
粉末冶金
微弧氧化
2A12铝合金
表面改性
电化学腐蚀
powder metallurgy
microarc oxidation
2A12 aluminium alloy
surface modification
electrochemical corrosion
