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采用电化学腐蚀和浸泡腐蚀研究了Al-7Si铸造合金在NaC1含量为3.5%的水溶液中的腐蚀行为,探讨了Mn、Sn对Al-7Si合金的塔菲尔曲线以及自腐蚀电位、腐蚀电流密度等电化学参数的影响,并利用电子分析天平和扫描电镜分别对各合金浸泡腐蚀后的质量损失和腐蚀形貌进行了测量与分析。结果表明,各试验合金均较快进入钝化状态。随着Mn、Sn的加入,各合金自腐蚀电位均向负向移动、腐蚀电流密度增高,腐蚀质量损失增大,耐腐蚀性能降低。同时合金的腐蚀形貌和腐蚀机理也发生转变。
The corrosion behavior of Al-7Si cast alloy in 3.5% NaC1 aqueous solution was investigated by electrochemical corrosion and immersion corrosion. The Tafel curves of Al-7Si alloy with Mn and Sn were investigated. The corrosion potentials And other electrochemical parameters of the impact of the use of electronic analytical balance and scanning electron microscopy of the alloy after soaking corrosion mass loss and corrosion morphology were measured and analyzed. The results show that the test alloy into the passivation state faster. With the addition of Mn and Sn, the self-corrosion potentials of all the alloys all moved in the negative direction, the corrosion current density increased, the corrosion mass loss increased, and the corrosion resistance decreased. At the same time, the corrosion morphology and corrosion mechanism of the alloy also changed.