Abstract Role of alloying of lead in hot dip galvanized coating deposited on mild steel wire on their corrosion characteristics are studied exposing them in industrial, coastal urban environments and laboratory simulated electrolytes. Various corrosion evaluation techniques namely mass loss, electrochemical impedance spectroscopy and direct current polarization methods are used to assess corrosion characteristics of the wires. Corrosion products formed on the exposed samples and cross section of the coatings are analyzed by X-Ray Diffraction, Raman Spectroscope and Scanning Electron Microscope. Lead is observed to change the corrosion characteristics of the coatings with change in constituents of the environments. In saline electrolytes, alloying of lead is found to accelerate the corrosion rate. This metal deposits as cluster on top layer of the galvanized coatings and acts as strong cathodes with respect to the zinc and accelerates the corrosion rate. In sulfurous environments, a stifling effect on rate of corrosion is noted which is attributed to the formation of stable and moisture insoluble sulfate compounds of lead on the surface of the coating.

中文翻译：

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铅合金化对暴露在大气、模拟实验室和使用环境中的镀锌涂层腐蚀特性的影响

摘要 在工业、沿海城市环境和实验室模拟电解质中，研究了沉积在低碳钢丝上的热浸镀锌涂层中铅合金化对其腐蚀特性的作用。各种腐蚀评估技术，即质量损失、电化学阻抗谱和直流极化方法用于评估电线的腐蚀特性。通过 X 射线衍射、拉曼光谱和扫描电子显微镜分析在暴露样品和涂层截面上形成的腐蚀产物。观察到铅会随着环境成分的变化而改变涂层的腐蚀特性。在盐水电解质中，发现铅合金化会加速腐蚀速率。这种金属以簇的形式沉积在镀锌涂层的顶层，并作为锌的强阴极并加速腐蚀速率。在含硫环境中，注意到对腐蚀速率的抑制作用，这是由于在涂层表面形成了稳定且不溶于水的铅硫酸盐化合物。