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Phytic acid conversion coating on Mg-Li alloy

被引：113
作者：
Gao, Lili [1 ]
Zhang, Chunhong [1 ]
Zhang, Milin [1 ]
Huang, Xiaomei [1 ]
Jiang, Xi [1 ]
机构：
[1] Harbin Engn Univ, Coll Mat Sci & Chem Engn, Minist Educ, Key Lab Superlight Mat & Surface Technol, Harbin 150001, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2009年 / 485卷 / 1-2期
基金：
美国国家科学基金会;
关键词：
Mg-Li alloy; Chemical conversion coating; Phytic acid; Chelate compound; Corrosion resistance; MECHANICAL-PROPERTIES; DEFORMATION-BEHAVIOR; CORROSION-RESISTANCE; MAGNESIUM ALLOYS; LITHIUM; MICROSTRUCTURES;
D O I：
10.1016/j.jallcom.2009.06.089
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070305 [高分子化学与物理];
摘要：
An environment-friendly chemical conversion coating for Mg-Li alloy was obtained by using a phytic acid solution. The influencing factors of phytic acid conversion coating were discussed through orthogonal experiments. and the optimum processing parameters were confirmed. Then morphology, composition. the forming process and corrosion resistance of the coating were investigated. Analysis by SEM showed that the phytic acid conversion coating was a uniform coating with white flower-like deposit. EDS and FT-IR images displayed that the conversion coating consisted of Mg, Al, O, P and C, the main composition of the coating was the chelate compounds of phytic acid and Mg2+ or Al3+. Analysis of open circuit potential (OCP) evolution illustrated that 600 s was a sufficient forming time for the conversion coating The results of electrochemical potentiodynamic polarization and hydrogen evolution measurement indicated that the phytic acid conversion coating provided effective protection to the substrate of Mg-Li alloy (C) 2009 Elsevier B.V. All rights reserved
引用
收藏
页码：789 / 793
页数：5
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