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

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

Corrosion Communications (Jun 2023)

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

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

Affiliations

Chunyan Zhang: AECC Harbin Dong An Engine Co. Ltd., Harbin 150066, China; Corrosion and Protection Laboratory, Key Laboratory of Superlight Materials and Surface Technology (Harbin Engineering University), Ministry of Education, Harbin 150001, China
Yuyang Chen: School of Materials Science and Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Baoxing Yu: Shi-changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
Peng Zhou: The State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China
Yunfei Zhai: Shanghai Aerospace Equipments Manufacturer Co. Ltd., Shanghai 200245, China
Yan Chen: Shanghai Aerospace Equipments Manufacturer Co. Ltd., Shanghai 200245, China
Xiaochen Zhang: College of Materials Chemical and Engineering, Heilongjiang Institute of Technology, Harbin 150050, China
Tao Zhang: Corrosion and Protection Laboratory, Key Laboratory of Superlight Materials and Surface Technology (Harbin Engineering University), Ministry of Education, Harbin 150001, China; The State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China; Corresponding author.
Fuhui Wang: The State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China

Journal volume & issue: Vol. 10
pp. 69 – 79

Abstract

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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.

Published in Corrosion Communications

ISSN: 2667-2669 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Materials of engineering and construction. Mechanics of materials
Website: https://www.journals.elsevier.com/corrosion-communications

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