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Effect of K2HPO4 Concentration on the Formation, Structure, Composition and Protectiveness of Conversion Coating Deposited on AZ31 Magnesium Alloy

文献类型：期刊论文

作者Wu, Liping1; Dong, Junhua1; Zheng, Xianfei2; Wang, Zhongying3; Sun, Xiaoying4; Shang, Xiuling4; Ke, Wei1; Wang, Changgang1
刊名ACTA METALLURGICA SINICA-ENGLISH LETTERS
出版日期2025-01-22
页码16
关键词Magnesium alloy Potentiostatic technique Phosphate coating
ISSN号1006-7191
DOI10.1007/s40195-025-01815-3
通讯作者Dong, Junhua(jhdong@imr.ac.cn) ; Wang, Changgang(cgwang@imr.ac.cn)
英文摘要In deaerated 0.05 M, 0.1 M, 0.2 M and 0.5 M K2HPO4 solutions with pH 9.5, AZ31 magnesium (Mg) alloy was subjected to potentiostatic polarization at - 0.8 VSCE to deposit a phosphate conversion coating. The morphology, structure, chemical composition, and protective performance of the conversion coating during the formation process were characterized. The results showed that amorphous Mg(OH)2 and MgHPO4 and crystallized KMgPO46H2O (struvite-K) were successively deposited on the surface of AZ31 Mg alloy in the four solutions. MgHPO4 was converted from Mg(OH)2, while struvite-K was transformed from MgHPO4. The distribution of Mg(OH)2, MgHPO4 and struvite-K along the thickness of the coating differs with K2HPO4 concentration. As the concentration of K2HPO4 increased, the coating time was gradually shortened, and the coating was gradually thinned. Meanwhile, the ratio of the nucleation rate to the growth rate of struvite-K crystal nuclei increased, resulting in a decrease in the size of struvite-K crystal. When the concentration of K2HPO4 increased from 0.05 to 0.1 M, the content of struvite-K increased, and the protective performance of the coating was enhanced. However, as the concentration of K2HPO4 continued to increase to 0.5 M, the content of struvite-K and the protective performance of the coating decreased.
资助项目National Natural Science Foundation of China[52373322]
WOS研究方向Metallurgy & Metallurgical Engineering
语种英语
WOS记录号WOS:001401149300001
出版者CHINESE ACAD SCIENCES, INST METAL RESEARCH
资助机构National Natural Science Foundation of China
源URL  
专题金属研究所_中国科学院金属研究所
通讯作者Dong, Junhua; Wang, Changgang
作者单位1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
2.Changda Hosp, Anshan 114000, Peoples R China
3.Ansteel Grp Corp Gen Hosp, Anshan 114000, Peoples R China
4.Guangdong Midea Air Conditioning Equipment CO LTD, Foshan 528311, Peoples R China
推荐引用方式
GB/T 7714		 Wu, Liping,Dong, Junhua,Zheng, Xianfei,et al. Effect of K2HPO4 Concentration on the Formation, Structure, Composition and Protectiveness of Conversion Coating Deposited on AZ31 Magnesium Alloy[J]. ACTA METALLURGICA SINICA-ENGLISH LETTERS,2025:16.
APA Wu, Liping.,Dong, Junhua.,Zheng, Xianfei.,Wang, Zhongying.,Sun, Xiaoying.,...&Wang, Changgang.(2025).Effect of K2HPO4 Concentration on the Formation, Structure, Composition and Protectiveness of Conversion Coating Deposited on AZ31 Magnesium Alloy.ACTA METALLURGICA SINICA-ENGLISH LETTERS,16.
MLA Wu, Liping,et al."Effect of K2HPO4 Concentration on the Formation, Structure, Composition and Protectiveness of Conversion Coating Deposited on AZ31 Magnesium Alloy".ACTA METALLURGICA SINICA-ENGLISH LETTERS (2025):16.

入库方式： OAI收割

来源：金属研究所

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