镁合金AZ31表面无铬磷酸盐转化膜的制备、结构及性能

中国腐蚀与防护学报

2012, Vol. 32

Issue (1): 13-17

研究报告

本期目录 | 过刊浏览

镁合金AZ31表面无铬磷酸盐转化膜的制备、结构及性能

崔学军^1,2,3,周吉学³,王修春³

1. 材料腐蚀与防护四川省重点实验室自贡 643000
2. 四川理工学院材料与化学工程学院自贡 643000
3. 山东省科学院新材料研究所济南 250014

PREPARATION, STRUCTURE AND CORROSION RESISTANCE OF CHROME-FREE PHOSPHATE FILM FOR MAGNESIUM ALLOY AZ31

CUI Xuejun^1,2,3, ZHOU Jixue³, WANG Xiuchun³

1. Materials Corrosion and Protection Key Laboratory of Sichuan Province, Zigong 643000
2. College of Materials and Chemical Engineering, Sichuan University of Science and Engineering, Zigong 643000
3. New Materials Institute of Shandong Academy of Sciences, Ji'nan 250014

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摘要: 用化学沉积的方法在镁合金AZ31表面获得了无铬、无氟和无亚硝酸盐的环保型化学转化膜。 SEM，\linebreak EDS及XRD分析表明，以磷酸盐和无氟添加剂为主要成分，在镁合金AZ31表面获得了致密、均匀和无网状裂纹的磷化膜。磷化膜厚度为12 μm~15 μm，主要物相为MnHPO₄•2.25H₂O，主要元素成分为O，Mg，P，Mn和Al。磷化后的镁合金AZ31通过中性盐雾测试(NSS)，72 h后未见腐蚀现象，浸涂氨基烘漆后的NSS测试达到204 h未见明显腐蚀，结果表明磷化膜具有良好的耐蚀性能。电化学极化曲线测试结果显示，磷化后镁合金AZ31的E_corr比未处理的正移111 mV，I_corr至少降低了三个数量级，磷化膜通过抑制阳极溶解和阴极析氢过程，有效地提高了镁合金AZ31的耐蚀性能。

关键词 ：镁合金, 磷酸盐转化膜, 环保, 耐蚀

Abstract：An environment-friendly phosphate film was obtained on the AZ31 magnesium alloy surface via chemical deposition methods. The morphology, compositions and phase compositions of the film were examined using scanning electron microscopy (SEM), energy dispersive spectrometer (EDS) and X-ray diffractometer (XRD). The results show that a dense, uniform and crack-free phosphate film can be prepared using the solution with free of chromate, fluorides and nitrite. The phosphate films are mainly composed of MnHPO₄•2.25H₂O, The film thickness is between 12 μm and 15 μm and the compositions consist of O, Mg, P, Mn and Al. the film hardly appears corrosion phenomenon for 72 h in the neutral salt spray test (NSS), and the time could arrive 204 h after the plus paint. The test results indicate that the phosphate film is of good corrosion resistance. Potentiodynamic polarization curves prove that the E_corr with the film is shifted positively 111 mV (vs. SCE); the I_corr is decreased at least by three orders compared with that of the bare substrate AZ31 respectively. The results show also that the existence of the film has a great inhibitive action on anodic dissolution and restraint action on the cathodic hydrogen evolution, which will effectively improve the corrosion resistance for magnesium alloy AZ31.

Key words： magnesium alloy phosphate film friend environment corrosion resistance

收稿日期: 2010-10-19

ZTFLH:

TG174.4

基金资助:

四川理工学院人才引进基金项目（2011RC02）和腐蚀与防护四川省重点实验室开放基金项目（2011CL08）资助

通讯作者: 崔学军 E-mail: cxj_2046@163.com

Corresponding author: CUI Xuejun E-mail: cxj_2046@163.com

作者简介: 崔学军，男，1978年生，副教授，博士，研究方向为金属材料腐蚀与防护

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引用本文:

崔学军,周吉学,王修春. 镁合金AZ31表面无铬磷酸盐转化膜的制备、结构及性能[J]. 中国腐蚀与防护学报, 2012, 32(1): 13-17.
CUI Hua-Jun. PREPARATION, STRUCTURE AND CORROSION RESISTANCE OF CHROME-FREE PHOSPHATE FILM FOR MAGNESIUM ALLOY AZ31. J Chin Soc Corr Pro, 2012, 32(1): 13-17.

链接本文:

https://www.jcscp.org/CN/ 或 https://www.jcscp.org/CN/Y2012/V32/I1/13

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