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The kinetics and mechanism of filiform corrosion occurring on zinc-aluminium-magnesium coated steel

机译:锌铝镁涂层钢上丝状腐蚀的动力学和机理

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This paper describes a systematic study into the initiation and propagation of filiform corrosion (FFC) on industrially important Zinc-Aluminium-Magnesium (ZAM) alloy coatings for steels. An artificial scribe defect is created in model organic coatings applied to ZAM. Corrosion is initiated using HCl, NaCl, FeCl2 and acetic acid. Only acetic acid is able to reproducibly initiate FFC. The FFC (area) rate is shown to be proportional to the amount of acetic acid introduced. The FFC mechanism is explained in terms of the relative susceptibility of alloy phases to anodic dissolution, determined using scanning electron microscopy and scanning Kelvin probe force microscopy.
机译:本文描述了对工业上重要的钢用锌铝镁(ZAM)合金涂层的丝状腐蚀(FFC)的发生和传播的系统研究。在应用于ZAM的模型有机涂料中会产生人为划痕缺陷。使用HCl,NaCl,FeCl2和乙酸开始腐蚀。仅乙酸能够可再现地引发FFC。 FFC(面积)速率显示为与引入的乙酸量成比例。 FFC机制是通过使用扫描电子显微镜和扫描开尔文探针力显微镜确定的合金相对阳极溶解的相对敏感性来解释的。

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