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中国腐蚀与防护学报  2017, Vol. 37 Issue (3): 227-232    DOI: 10.11902/1005.4537.2016.016
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KH-550对AZ31B镁合金表面微弧氧化膜结构及性能的影响
崔学军1,2(),代鑫1,郑冰玉1,张颖君1,2
1 四川理工学院材料科学与工程学院 自贡 643000
2 四川理工学院 材料腐蚀与防护四川省重点实验室 自贡 643000
Effect of KH-550 Content on Structure and Properties of a Micro-arc Oxidation Coating on Mg-alloy AZ31B
Xuejun CUI1,2(),Xin DAI1,Bingyu ZHENG1,Yingjun ZHANG1,2
1 School of Materials Science and Engineering, Sichuan University of Science and Engineering, Zigong 643000, China
2 Material Corrosion and Protection Key Laboratory of Sichuan Province, Sichuan University of Science and Engineering, Zigong 643000, China
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摘要 

通过微弧氧化 (MAO) 的方法在Na2SiO3-KOH-NaF电解质溶液中处理AZ31B镁合金,利用SEM、XRD和电化学等表征手段,研究了硅烷偶联剂KH550对MAO膜结构及性能的影响。结果表明,KH-550浓度在0~20 mL/L范围内增加时,MAO膜表面微孔尺寸和粗糙度先减小后增大,膜层厚度和耐蚀性能先增加后降低;引入KH-550后并未改变MAO膜的物相结构。分析认为KH-550通过硅烷醇的吸附和化学作用,增加了阳极表面薄弱区域离子移动的阻力,抑制镁合金在MAO过程的弧光放电,从而提高了膜层的生长效率,细化并均匀化微孔,改善了MAO膜的耐蚀能力。

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崔学军
代鑫
郑冰玉
张颖君
关键词:  镁合金  涂层  阳极氧化  硅烷偶联剂  抑弧效应    
Abstract: 

Influence of the content of coupling reagent KH-550 on the morphology, phase constituent and corrosion resistance in 3.5%NaCl solution of micro-arc oxidation (MAO) coatings, prepared on Mg-alloy AZ31B by a constant voltage mode in an electrolyte of Na2SiO3-KOH-NaF, was investigated by scanning electron microscopy, X-ray diffractometer and electrochemical methods. Results showed that the size of micro pores and the roughness of the MAO coatings are increased firstly and then decreased with the increasing amount of KH-550 in a concentration range of 0~20 mL/L, but its thickness and corrosion resistance show a converse result. However, the phase constituents of the MAO coatings are not changed. The preliminary analysis suggested that KH-550 hinders the ionic migration on certain weak areas, where silanol was adsorbed and/or reacted with, and thereby the arc discharge was modulated during MAO process. Therefore, KH-550 improves the growing efficiency of MAO coating, homogenizes the size and distribution of micro pores, and enhances the corrosion protection ability of the MAO coating on Mg-alloy.

Key words:  magnesium alloy    coating    plasma electrolytic oxidation    silane coupling agent    restraining sparking
收稿日期:  2016-01-09                出版日期:  2017-07-04      发布日期:  2017-07-04      期的出版日期:  2017-07-04
基金资助: 四川省科技支撑计划 (2016JZ0032),省级大学生创新创业训练计划 (201610622100) 和四川理工学院人才引进基金(2017RCL15)
引用本文:    
崔学军,代鑫,郑冰玉,张颖君. KH-550对AZ31B镁合金表面微弧氧化膜结构及性能的影响[J]. 中国腐蚀与防护学报, 2017, 37(3): 227-232.
Xuejun CUI,Xin DAI,Bingyu ZHENG,Yingjun ZHANG. Effect of KH-550 Content on Structure and Properties of a Micro-arc Oxidation Coating on Mg-alloy AZ31B. Journal of Chinese Society for Corrosion and protection, 2017, 37(3): 227-232.
链接本文:  
http://www.jcscp.org/CN/10.11902/1005.4537.2016.016  或          http://www.jcscp.org/CN/Y2017/V37/I3/227
Number Content of KH-550mLL-1 pHvalue Conductivityms
a 0 13.77 23.94
b 1 13.50 23.31
c 4 13.61 23.24
d 7 13.38 23.19
e 10 13.38 22.81
f 20 13.16 23.08
表1  电解质溶液的pH值和电导率与KH-550浓度的关系
图1  电解液中添加不同浓度KH-550时所得MAO膜的表面形貌
图2  KH-550含量与MAO膜厚度的关系
图3  KH-550含量与MAO膜粗糙度的关系
图4  添加7 mL/L KH-550前后MAO样品的XRD谱
图5  MAO处理样品在3.5%NaCl溶液中的极化曲线
Concentration of KH-550 / % -EcorrmV Icorr μAcm-2 -bc mVdec-1
0 1522 0.415 231
1 1446 0.159 263
4 1416 0.110 261
7 1380 0.120 197
10 1306 0.178 253
20 1324 0.570 287
表2  与图5极化曲线相对应的拟合电化学参数值
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