Cu含量对2A14铝合金显微组织和腐蚀性能的影响

为了提升2A14铝合金耐局部腐蚀性能，采用扫描电镜（SEM）、点蚀测试、循环阳极极化曲线（Tafel）和电化学阻抗谱（EIS）等分析测试方法，研究了Cu含量对2A14铝合金锻件显微组织和腐蚀性能的影响.结果表明：随着Cu含量降低，诱导点蚀的Al2Cu和AlCuMgSi残余结晶相体积分数减小，点蚀坑密度显著降低，合金抗点蚀性能和电化学腐蚀性能大幅 提高.
In order to elevate the localized corrosion resistance of 2A14 aluminum alloy，the effect of Cu content on the microstructure and corrosion-resistance properties of 2A14 aluminum alloy forgings was investigated by using scanning electron microscopy（SEM），pitting corrosion tests，cyclic anodic polarization curves （Tafel） and electrochemical impedance spectroscopy（EIS）. The results showed that the volume fraction of coarse Al2Cu and AlCuMgSi residual crystalline phase which induced pitting in 2A14 aluminum alloy matrix was reduced with the decrease of Cu content. The pitting density decreased significantly，the resistance to pitting properties and electrochemical corrosion properties was greatly improved due to the reduction of the constituents.