Electrically conductive and corrosion resistant coating on MgLi alloys, Part I: Chemical conversion coating

Corrosion Communications Pub Date : 2024-05-03 DOI:10.1016/j.corcom.2023.08.007

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Abstract

MgLi alloys are one of the lightest structural materials, but suffer from severe corrosion due to the hyperactivity of Mg and Li. In this work, an electrically conductive and corrosion-resistant chemical conversion coating was fabricated on a duplex MgLi alloy LA103Z by two different routes: the first route using a conventional immersion treatment (Im-PCCs); and the second route using a brushing conversion treatment (Br-PCCs). Results demonstrate that chemical composition of conversion coatings remained, but surface morphology was altered. The Im-PCC depicts many lamellar CaHPO₄ when the immersion time was longer than 60 s. The Br-PCC shows no lamellas on surface till a treatment time of 120 s. These lamellar crystals are detrimental to the electrical contact resistance (ECR), and the ECR for the Br-PCC was one order of magnitude lower than that for the Im-PCCs. Corrosion resistance for Br-PCCs, however, was slightly lower than Im-PCCs.

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镁锂合金导电耐腐蚀涂层，第 I 部分：化学转化涂层

镁锂合金是最轻的结构材料之一，但由于镁和锂的超活性而遭受严重腐蚀。在这项工作中，通过两种不同的方法在双相镁锂合金 LA103Z 上制作了导电耐腐蚀化学转化涂层：第一种方法采用传统的浸泡处理（Im-PCCs）；第二种方法采用刷涂转化处理（Br-PCCs）。结果表明，转化涂层的化学成分保持不变，但表面形态发生了改变。当浸泡时间超过 60 秒时，Im-PCC 表面会出现许多片状 CaHPO4。不过，Br-PCC 的耐腐蚀性略低于 Im-PCC。

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来源期刊

Corrosion Communications

CiteScore

7.30

自引率

0.00%

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