Abstract Localised Cr depletion caused by defects in Fe-based amorphous coatings, e.g. pores, oxides and crystalline phases, is thought to be the dominating reason for decreasing corrosion resistance in the coatings. An electrochemical polarisation treatment was used to selectively dissolve Cr-depleted zones in the coatings. The corrosion behaviour of the coatings was studied by potentiodynamic and potentiostatic polarisation and electrochemical impedance spectroscopy in 3.5 wt.% NaCl solution. With the elimination of Cr-depleted zones the corrosion resistance of the coatings was enhanced, with an order of magnitude reduction in the passive current density together with the improvement of passive film stability.

中文翻译：

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通过消除贫铬区增强铁基非晶涂层的耐腐蚀性

摘要 Fe 基非晶涂层中的缺陷（例如孔隙、氧化物和结晶相）引起的局部 Cr 耗尽被认为是涂层耐腐蚀性降低的主要原因。电化学极化处理用于选择性地溶解涂层中的贫铬区。通过动电位和恒电位极化以及电化学阻抗谱在 3.5 wt.% NaCl 溶液中研究了涂层的腐蚀行为。随着贫铬区的消除，涂层的耐腐蚀性得到增强，钝化电流密度降低了一个数量级，同时钝化膜稳定性也得到了提高。