Preparation of Conversion Coating with Cr free on Mg-Li Alloy

Zhang Hua1; Yao Guangchun1; Wang Shulan2; Che Dehui1; Liu Zhengang1

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Preparation of Conversion Coating with Cr free on Mg-Li Alloy
Issue 12, Pages: 917-919(2007)
Published： 2007 ，
DOI：

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[1]张华,姚广春,王淑兰,车德会,刘振刚.镁锂合金无铬转化膜的制备工艺研究[J].特种铸造及有色合金,2007(12):917-919+898.

Zhang Hua1, Yao Guangchun1, Wang Shulan2, et al. Preparation of Conversion Coating with Cr free on Mg-Li Alloy. [J]. Special Casting & Nonferrous Alloys (12):917-919(2007)
[1]张华,姚广春,王淑兰,车德会,刘振刚.镁锂合金无铬转化膜的制备工艺研究[J].特种铸造及有色合金,2007(12):917-919+898. DOI：

Zhang Hua1, Yao Guangchun1, Wang Shulan2, et al. Preparation of Conversion Coating with Cr free on Mg-Li Alloy. [J]. Special Casting & Nonferrous Alloys (12):917-919(2007) DOI：

摘要

利用无铬化学转化技术来提高Mg-10Li-1Zn合金的抗腐蚀性能。采用磷酸盐-高锰酸盐转化液

在合金表面形成一层均匀的化学转化膜。用正交试验优选了转化液组分含量、温度及时间等工艺参数

并进一步分析了该无铬转化膜的显微结构。结果表明

此转化膜的最佳工艺条件是KH2PO4为50g/L

KMnO4为40g/L

成膜温度为55℃

成膜时间为20min。EDX测试结果显示

该转化膜主要由P、Mn、K、Mg和O元素构成。动电位极化曲线结果表明

与传统的铬酸盐转化膜相比

该磷酸盐-高锰酸盐转化膜能够对Mg-10Li-1Zn合金提供更好的腐蚀防护。

Abstract

The chemical conversion coating was homogeneously created on the surface of Mg-10Li-1Zn alloy in a phosphate-permanganate solution.Some processing variables

including chemical composition content

temperature and time of the conversion solution

were optimized by orthogonal testing to obtain a desirable constituents and processing.Moreover

the microstructure and chemical composition of conversion coating with Cr free were described.Hydraulic-potential polarization curves show that the phosphate-permanganate conversion coating exhibits better corrosion-resistantance on Mg-10Li-1Zn alloy compared with conventional chromate conversion coating.