磷化液中ZnO对AZ61镁合金磷化膜的影响

山东大学学报(工学版) ›› 2009, Vol. 39 ›› Issue (3): 77-80.

磷化液中ZnO对AZ61镁合金磷化膜的影响

高宇杜爱玲杨艳玲

高宇,杜爱玲:山东大学化学与化工学院, 山东济南 250061;
杨艳玲:潍坊职业学院化学工程系, 山东潍坊 261041

收稿日期:2009-03-02 出版日期:2009-06-16 发布日期:2009-06-16
通讯作者: 杜爱玲(1956-),女,山东烟台人,教授，研究方向为镁合金的表面处理.E-mail:duail@sina.com
作者简介:高宇（1984-），女，山东菏泽人，硕士研究生，研究方向为镁合金的表面处理. E-mail:gaoyu5725588@163.com

Influence of zinc oxide in a phosphating bath on phosphate coating on AZ61 magnesium alloy

GAO Yu, DU Ai-ling:School of Chemistry and Chemical Engineering, Shandong University, Jinan 250061, China;
YANG Yan-ling:Department of Chemical Engineering, Weifang Vocational College, Weifang 261041, China

Received:2009-03-02 Online:2009-06-16 Published:2009-06-16

摘要/Abstract

摘要：

探讨了锌系磷化液中主要的成膜物质ZnO的质量浓度对AZ61镁合金磷化膜的微观结构和性能的影响.利用金相显微镜、扫描电镜、能谱分析仪观察和分析了磷化膜的结构、表面形态和组成成分,并通过阳极极化曲线测量评价了磷化膜的耐腐蚀性能.结果表明:在低ZnO质量浓度的磷化液中,获得的磷化膜比较疏松且不完整,其并未表现出优异的耐腐蚀性;在高ZnO质量浓度的磷化液中,得到的磷化膜晶粒较粗大,厚度不均匀,耐腐蚀性不佳;在中等ZnO质量浓度2.0g／L的磷化液中,得到了均匀、完整的磷化膜层,极化曲线测量表明了其在质量分数为3.5％NaCl溶液中具有较好的耐腐蚀性.

关键词: 镁合金;磷化膜;磷化;耐蚀性

Abstract:

The influences of the mass concentration of zinc oxide(the main film-forming substance) in the phosphating bath on the microstructure and properties of the phosphate coating on AZ61 magnesium alloy were studied. The structure, surface morphologies and compositions of the phosphate coatings were observed and analyzed by using a metallographical microscope,SEM and EDS. Anodic polarization measurement was used to assess the corrosion resistance of the phosphate coating on the magnesium alloy. The results indicated that the phosphate coating obtained from a phosphating bath with a lower concentration of ZnO was a loose and defected structure, without exhibiting enough corrosion resistance. The phosphate coating obtained from a phosphating bath with a higher mass concentration of ZnO is composed of coarse crystals and the thickness of the coating was uneven, showing poor corrosion resistance. The uniform and intact phosphate coating which was obtained from a phosphating bath with a medium mass concentration of 2.0g/L ZnO showed high corrosion resistance in a 3.5％ NaCl solution.

Key words: magnesium alloy; phosphate coating; phosphating; corrosion resistance

高宇杜爱玲杨艳玲. 磷化液中ZnO对AZ61镁合金磷化膜的影响[J]. 山东大学学报(工学版), 2009, 39(3): 77-80.

GAO Yu, DU Ai-ling, YANG Yan-ling. Influence of zinc oxide in a phosphating bath on phosphate coating on AZ61 magnesium alloy[J]. JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE), 2009, 39(3): 77-80.

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