Effects of nucleation pretreatment on corrosion resistance of conversion coating on magnesium alloy Mg-10Gd-3Y-0.4Zr

Corrosion Communications Pub Date : 2023-06-01 DOI:10.1016/j.corcom.2022.10.001

Chunyan Zhang , Yuyang Chen , Baoxing Yu , Peng Zhou , Yunfei Zhai , Yan Chen , Xiaochen Zhang , Tao Zhang , Fuhui Wang

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引用次数: 1

Abstract

To improve corrosion resistance of phosphate chemical conversion coatings (PCCs) on magnesium alloy Mg-10Gd-3Y-0.4Zr, a new route was proposed. The phosphate conversion treatment was preceded by two nucleation pretreatment processes in the form of physical adhesion and chemical adsorption. The present study focused on the effects of two nucleation pretreatments of silane coupling agent KH-550 + nano-SiO₂ sol process and Ti/Zr surface modification treatment on microstructure and corrosion resistance of PCCs on magnesium alloy Mg-10Gd-3Y-0.4Zr. Results demonstrate that nucleation pretreatment can prefabricate dispersed nuclei on substrate's surface, which significantly enhances the nucleation rate during the initial stage of coating formation, and decreases the crystal size of PCCs. Corrosion resistance of the PPCs was increased by a factor of 4. The Ti/Zr pretreatment demonstrates a superior application perspective due to the ease-of-fabrication and simplicity.

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成核预处理对Mg-10Gd-3Y-0.4Zr镁合金转化涂层耐蚀性的影响

为提高镁合金Mg-10Gd-3Y-0.4Zr表面磷酸盐化学转化涂层的耐蚀性，提出了一种新的途径。磷酸盐转化处理之前有两个成核预处理过程，即物理粘附和化学吸附。研究了硅烷偶联剂KH-550+纳米SiO2溶胶法和Ti/Zr表面改性两种成核预处理对镁合金Mg-10Gd-3Y-0.4Zr表面PCCs微观结构和耐蚀性的影响，这显著提高了涂层形成初始阶段的成核速率并减小了PCCs的晶体尺寸。PPCs的耐腐蚀性提高了4倍。Ti/Zr预处理由于易于制造和简单，显示出优越的应用前景。

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来源期刊

Corrosion Communications

CiteScore

7.30

自引率

0.00%

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