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材料研究学报  2016, Vol. 30 Issue (3): 235-240    DOI: 10.11901/1005.3093.2015.410
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Mg-Mn-RE微弧氧化陶瓷膜层耐蚀性对比研究
李玉海(), 张白冰, 董旭光, 王帅
沈阳理工大学材料科学与工程学院 沈阳 110159
Comparative Study on Corrosion Resistance of Micro Arc Oxidation Ceramic Coatings on Mg-Mn-RE Alloy
LI Yuhai*(), ZHANG Baibing, DONG Xuguang, WANG Shuai
( School of Materials and Science Engineering, Shenyang University and Technology, Shenyang 110159, China)
引用本文:

李玉海, 张白冰, 董旭光, 王帅. Mg-Mn-RE微弧氧化陶瓷膜层耐蚀性对比研究[J]. 材料研究学报, 2016, 30(3): 235-240.
Yuhai LI, Baibing ZHANG, Xuguang DONG, Shuai WANG. Comparative Study on Corrosion Resistance of Micro Arc Oxidation Ceramic Coatings on Mg-Mn-RE Alloy[J]. Chinese Journal of Materials Research, 2016, 30(3): 235-240.

全文: PDF(2588 KB)   HTML
摘要: 

利用双向脉冲电源对Mg-Mn-RE镁合金分别在铝酸盐,磷酸盐和硅酸盐三种电解液体系中进行微弧氧化处理, 通过扫描电镜(SEM),X射线衍射分析(XRD),动电位极化曲线以及交流阻抗(EIS)等检测方法对合金表面生成的陶瓷膜层的微观结构及耐蚀性进行对比研究.结果表明: 在磷酸盐和硅酸盐体系中制备的膜层虽然截面较为致密, 但膜层较薄且表层分布有明显的龟裂裂纹, 耐蚀效果改善并不理想; 而在铝酸盐体系中制备的膜层厚度可达7.9 μm, 结构致密且表面平整无裂纹.相比于磷酸盐和硅酸盐体系, 在铝酸盐体系中制备的陶瓷膜层具有更佳的耐蚀性能.

关键词 金属材料Mg-Mn-RE镁合金微弧氧化耐蚀性能    
Abstract

A series of micro-arc oxidation (MAO) films were prepared on Mg-Mn-RE alloy by an alternating current with symmetric voltage in different alkaline solutions containing aluminate, phosphate or silicate and then the MAO films were characterized by SEM and XRD. The corrosion resistance of MAO films was evaluated by EIS potentiodynamic polarization. The results indicated that the MAO films prepared in phosphate or silicate systems have low thickness with obvious cracks, leading to poor corrosion resistance. In the contrast, the MAO films prepared in aluminate system exhibit the better corrosion resistance due to the compactness and higher surface quality, which shows a good prospect for the application.

Key wordsmetal materials    Mg-Mn-RE magnesium alloy    micro-arc oxidation (MAO)    corrosion resistance
收稿日期: 2015-07-17     
ZTFLH:  TG146.2  
作者简介: 李玉海
图1  各电解液体系陶瓷膜层与镁合金基体的Tafel极化曲线
图2  不同电解液体系陶瓷膜层表面形貌
图3  不同电解液体系陶瓷膜层的截面形貌
图4  不同电解液体系陶瓷膜层的XRD图谱
图5  不同电解液体系中所制备的陶瓷膜层与镁合金基体的Tafel极化曲线
No. Ecorr/V Icorr/Acm-2 bc/mV ba/mV Rp/Ωcm2
Substrate -1.57 1.775×10-4 4.129 8.699 1.91×102
Coating /Na3PO4 system -1.56 1.459×10-6 6.578 16.660 1.37×104
Coating /NaAlO2 system -1.49 1.362×10-6 5.344 5.248 2.75×104
Coating /Na2SiO3 system -1.46 1.781×10-6 6.213 12.136 1.33×104
表1  Tafel极化曲线拟合数据
图6  不同电解液体系与镁合金基体的EIS交流阻抗图谱
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