铸造技术2013，Vol.34Issue(3)：266-268,3.
Cu和Mg对Al-7Si铸造合金耐腐蚀性能的影响
Effects of Cu and Mg on Corrosion Resistance of Al-7Si Cast Alloy
摘要
Abstract
The corrosion behaviors of Al-7Si cast alloys in 3.5％NaCl aqueous solution were examined by using electrochemical and immersion corrosion tests.The influence of copper (Cu) and magnesium (Mg) on the Tafel curves and electrochemical parameters,such as free corrosion potential and corrosion current densities,of Al-7Si alloys were investigated.Moreover,the mass loss and morphology of each alloy after immersion corrosion were measured and analyzed by analytical balance and scanning electron microscopy.The results indicate that all the tested alloys can be passivated rapidly,their corrosion potential drifts to negative,their corrosion current density and corrosion mass loss increase with the addition of alloy elements Cu and Mg.Compared with element Mg,element Cu has a greater effect on the corrosion resistances of Al-7Si alloy,and can convert the corrosion mechanism of the alloy from pitting corrosion into intergranular corrosion.关键词
Al-Si铸造合金/耐腐蚀性/电化学试验/浸泡腐蚀Key words
Al-Si cast alloy/ corrosion resistance/ electrochemistry test/ immersion corrosion分类
矿业与冶金引用本文复制引用
崔国明,李兴霞,范鹏,许征兵,曾建民..Cu和Mg对Al-7Si铸造合金耐腐蚀性能的影响[J].铸造技术,2013,34(3):266-268,3.基金项目
广西大学有色金属材料及其加工新技术教育部重点实验室开放基金项目(GXKFJ09-02). （GXKFJ09-02）
