镁合金表面有机/无机杂化涂层的性能

doi:10.11901/1005.3093.2016.240

材料研究学报

2017, Vol. 31

Issue (3): 211-218 DOI: 10.11901/1005.3093.2016.240

研究论文

本期目录 | 过刊浏览

镁合金表面有机/无机杂化涂层的性能

高正源^1,³(

),曹献龙²,刘浪⁴,方轶琉¹,胡琳盛¹

1 重庆交通大学机电与车辆工程学院重庆 400074
2 重庆科技学院冶金与材料工程学院重庆 401331
3 重庆市计量质量检测研究院重庆 401121
4 重庆交通大学土木工程学院重庆 400074

Properties of Organic/Inorganic Hybrid Coatings Formed on Magnesium Alloy Surface

Zhengyuan GAO^1,³(

),Xianlong CAO²,Lang LIU⁴,Yiliu FANG¹,Linsheng HU¹

1 School of Mechatronics and Automotive Engineering, Chongqing Jiaotong University, Chongqing 400074, China
2 School of Metallurgy and Materials Engineering, Chongqing University of Science and Technology, Chongqing 401331, China
3 Chongqing Academy of Metrology and Quality Inspection, Chongqing, 401121, China
4 School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China

引用本文:

高正源,曹献龙,刘浪,方轶琉,胡琳盛. 镁合金表面有机/无机杂化涂层的性能[J]. 材料研究学报, 2017, 31(3): 211-218.
Zhengyuan GAO, Xianlong CAO, Lang LIU, Yiliu FANG, Linsheng HU. Properties of Organic/Inorganic Hybrid Coatings Formed on Magnesium Alloy Surface[J]. Chinese Journal of Materials Research, 2017, 31(3): 211-218.

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摘要:

在AZ31镁合金表面制备有机/无机杂化涂层,用扫描电子显微镜、扫描探针显微镜、电化学工作站、光学显微镜、涂层测厚仪等手段对杂化涂层的表面形貌、耐蚀性、附着力及厚度进行表征,研究了有机/无机杂化溶胶-凝胶体系的pH值对涂层性能的影响。结果表明：pH值对镁合金表面的杂化涂层的性能有显著的影响。当pH值为3~3.5时,可在镁合金表面制备出高平整度且少缺陷的涂层,厚度约为22 μm;当pH值为2.2~2.8时,涂层变薄、表面起伏较大且有较多的孔洞。当pH=3时杂化涂层具有良好的附着力和最正的腐蚀电位,且腐蚀电流密度最小(约为7.34×10^-5 A/cm²),相对于空白镁合金试样的缓蚀效率约为99.7%。

关键词 ：材料失效与保护, 镁合金, pH值, 溶胶-凝胶法, 耐蚀性

Abstract：

Organic/inorganic hybrid coatings were prepared on AZ31 magnesium alloy, which then was characterized by means of scanning electron microscope, scanning probe microscope, electrochemical analyzer, optical microscope and coatings thickness tester in terms of surface morphology, corrosion resistance, adhesion and thickness. While the influence of pH value of organic/inorganic hybrid sol-gel on the properties of organic/inorganic hybrid coating was also investigated. The results show that pH values of organic/inorganic hybrid sol-gel have important effect on the properties of the organic/inorganic hybrid coatings formed on AZ31 magnesium alloy: When pH value is in the range 3~3.5, a smooth and few defects hybrid coating of the thickness of 22 μm can be obtained; When pH value is in the range 2.2~2.8, the hybrid coating became thin and coarse with some big pores; When pH value equals to 3.0, the hybrid coating has good adhesion, highest corrosion potential and minimum corrosion current density (~7.34×10^-5 A/cm²). Corrosion inhibition efficiency of the hybrid coating prepared by sol-gel with pH 3.0 could reach ~ 99.7% compared to the blank AZ31 magnesium alloy.

Key words： materials failure and protection magnesium alloys pH value sol-gel method corrosion resistance

收稿日期: 2016-05-03

基金资助:重庆市质量技术监督局科研计划资助项目(CQZJKY2013001、CQZJKY2014017);国家质量监督检验检疫总局科技计划资助项目(2014QK263);重庆市南川区科技计划项目(CX201407);重庆市重点产业共性关键技术创新专项(cstc2016zdcy50002);重庆市基础与前沿研究计划项目(CSTC2015JCYJBX0140、CSTC2015JCYJA50003);重庆市教委科学技术研究项目(KJ1401314、KJ1401310)

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https://www.cjmr.org/CN/10.11901/1005.3093.2016.240 或 https://www.cjmr.org/CN/Y2017/V31/I3/211

图1 实验方案

表1 不同冰醋酸添加量下的杂化溶胶配方组成及pH值

图2 不同pH值下AZ31镁合金表面制备的杂化涂层的SEM图像

图3 pH值为2.2时在AZ31镁合金表面制备的杂化涂层SEM图像

表2 不同pH值下在镁合金表面制备的杂化涂层的厚度

图4 不同pH值时AZ31镁合金表面制备的杂化涂层上划痕光学显微镜图像

图5 镁合金表面上不同pH值下制备的杂化涂层的极化曲线

表3 不同pH值下制备的杂化涂层极化曲线的电化学参数结果和涂层缓蚀效率

表4 AZ31镁合金表面不同pH值下制备的杂化涂层的开路电位

图6 AZ31镁合金表面不同pH值下制备的杂化涂层的开路电位-时间曲线

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