Mn(NO3)2/Na2MoO4对AZ31B镁合金表面磷化膜微观形貌及耐蚀性的影响

doi:10.11902/1005.4537.2013.205

中国腐蚀与防护学报

2014, Vol. 34

Issue (5): 477-482 DOI: 10.11902/1005.4537.2013.205

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Mn(NO₃)₂/Na₂MoO₄对AZ31B镁合金表面磷化膜微观形貌及耐蚀性的影响

崔学军^1,²(

), 白成波², 朱一波², 闵虹云², 王荣², 林修洲^1,²

1. 四川理工学院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

Effect of Additives Mn(NO₃)₂ and/or Na₂MoO₄ on Micro-morphology and Corrosion Performance of Phosphate Coating on AZ31B Magnesium Alloy

CUI Xuejun^1,²(

), BAI Chengbo², ZHU Yibo², MIN Hongyun², WANG Rong², LIN Xiuzhou^1,²

1. Material Corrosion and Protection Key Laboratory of Sichuan Province, Zigong 643000, China
2. College of Materials and Chemical Engineering, Sichuan University of Science and Engineering, Zigong 643000, China

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摘要:

以AZ31B镁合金为基体,通过化学沉积的方法分别在添加Mn(NO₃)₂,Na₂MoO₄以及复配的锰系磷化溶液中获得了磷酸盐转化膜。采用扫描电子显微镜 (SEM)、电化学工作站及CuSO₄点滴等表征手段,研究添加剂对磷化膜表面微观形貌和耐蚀性的影响。结果表明：Mn(NO₃)₂含量在0~2 g/L之间增加时,磷化膜晶粒尺寸先减小后增大,耐蚀性先增大后降低；Na₂MoO₄含量在0~0.5 g/L之间增加时,磷化膜晶粒尺寸显著减小,然后增大,耐蚀性显著提高；Mn(NO₃)₂和Na₂MoO₄复配后膜层致密,耐蚀性增强,但差于单独引入Na₂MoO₄的改善效果。综合比较分析,Mn(NO₃)₂对锰系磷化膜耐蚀性的改善作用较小,而添加0.25 g/L的Na₂MoO₄获得的膜层更均匀细致,耐蚀性能更佳。

关键词 ： AZ31B镁合金, 化学转化膜, 添加剂, 微观形貌, 耐蚀性

Abstract：

A phosphate coating was prepared on AZ31B Mg alloy by chemical conversion process in a phosphorizing bath with additives Mn(NO₃)₂ and/or Na₂MoO₄, respectively. The effect of the additives on surface micromorphology and corrosion performance of the coatings were investigated by scanning electron microscope (SEM), electrochemical workstation and CuSO₄spot test. The results show that grain size of the films firstly decreases and then increases with of the increasing Mn(NO₃)₂ amount in a range of 0~2 g/L, correspondingly the corrosion resistance of the coatings becomes better and then worse; the grain size of the coating significantly reduces and then increases with the increasing Na₂MoO₄ amount in a range of 0~0.5 g/L, while the corrosion resistance of the coating rises up substantially; the surface morphology and corrosion resistance of the coatings can also be improved by simultaneously adding Mn(NO₃)₂ and Na₂MoO₄, but of which the effectiveness is inferior to that by merely adding Na₂MoO₄ in the phosphorizing bath. Through the above analysis, it follows that Mn(NO₃)₂ may play a weak role in enhancing the corrosion performance of the coatings; but it is interesting to note that by adding only 0.25 g/L Mn(NO₃)₂ to thephosphorizing bath the prepared coatings become much denser with better corrosion resistance.

Key words： AZ31B Mg alloy chemical conversion coating additive micromorphology corrosion resistance

ZTFLH:

TG174.4

基金资助:四川省教育厅重点项目 (12ZA261),材料腐蚀与防护四川省重点实验室开放基金项目 (2013CL01),四川理工学院人才引进基金 (2014RC18) 和四川理工学院大学生创新基金项目资助

作者简介: null

崔学军，男，1978年生，博士，副教授，研究方向为功能涂层及镁合金的腐蚀防护

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引用本文:

崔学军, 白成波, 朱一波, 闵虹云, 王荣, 林修洲. Mn(NO₃)₂/Na₂MoO₄对AZ31B镁合金表面磷化膜微观形貌及耐蚀性的影响[J]. 中国腐蚀与防护学报, 2014, 34(5): 477-482.
Xuejun CUI, Chengbo BAI, Yibo ZHU, Hongyun MIN, Rong WANG, Xiuzhou LIN. Effect of Additives Mn(NO₃)₂ and/or Na₂MoO₄ on Micro-morphology and Corrosion Performance of Phosphate Coating on AZ31B Magnesium Alloy. Journal of Chinese Society for Corrosion and protection, 2014, 34(5): 477-482.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2013.205 或 https://www.jcscp.org/CN/Y2014/V34/I5/477

图1 磷化膜的制备工艺

图2 不同Mn(NO3)2浓度下磷化膜的表面形貌

图3 不同Na2MoO4浓度下磷化膜的表面形貌

图4 不同Na2MoO4/Mn(NO3)2浓度下磷化膜的表面形貌

图5 不同添加剂及不同浓度下磷化膜在3.5%NaCl溶液中的极化曲线

表1 与图5极化曲线相对应的拟合电参数值

图6 磷化膜的耐点蚀时间与添加剂及含量的关系

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