Effect of pH on Phytic Acid Conversion Coating on AZ31B Magnesium Alloy

被引：0

作者：

Gao, Huan-fang ^{[1
]}

Zhang, Shengtao ^{[2
]}

Liu Cheng-long ^{[3
]}

Xu, Jun-qiang ^{[1
]}

Li, Jun ^{[1
]}

Li, Yu ^{[1
]}

机构：

[1] Chongqing Univ Technol, Coll Chem & Chem Engn, Chongqing, Peoples R China

[2] Chongqing Univ, Coll Chem & Chem Engn, Chongqing, Peoples R China

[3] Chongqing Univ Technol, Coll Mat & Engn, Chongqing, Peoples R China

来源：

PROCEEDINGS OF THE 7TH NATIONAL CONFERENCE ON CHINESE FUNCTIONAL MATERIALS AND APPLICATIONS (2010), VOLS 1-3 | 2010年

基金：

中国国家自然科学基金;

关键词：

phytic acid; pH value; magnesium alloy; conversion coating; corrosion resistance;

D O I：

暂无

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The influences of pH on the formation process, corrosion resistance and microstructure, chemical state of the phytic acid conversion coatings on AZ31B magnesium alloy were investigated by electrochemical measurements, hydrogen evolution method, scanning electron microscopy (SEM) and the energy dispersive X-ray spectroscopy (EDS), respectively. The results show that the reaction rate of magnesium alloy with phytic acid was fastest under pH=1, followed by pH=2 and pH=6 during the formation process of the conversion coatings. The coating surface formed under pH=1 was fragmentized and had some big cracks. Some cracks were also on the surface of the coating formed under pH=2 and the cracks were small and uniform. The sample was entirely covered under pH=6 and the conversion coating was thin. The conversion coating mainly consisted of the compounds of magnesium, aluminum, zinc, oxygen and phosphorus. The conversion coating formed under pH=2 had higher corrosion resistance than that of the conversion coatings formed under pH=1 and 6 and the treated samples with phytic acid has better corrosion resistance than untreated sample.

引用

页码：1414 / +

页数：2

共 19 条

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