朱阮利,张津,高帅,倪娜.SiO2 对镁合金阴极电泳涂层耐磨性的影响[J].表面技术,2015,44(7):27-33.
ZHU Ruan-li,ZHANG Jin,GAO Shuai,NI Na.Effect of SiO2 on the Abrasion Resistance of E-coatings on Magnesium Alloy[J].Surface Technology,2015,44(7):27-33 |
| SiO2 对镁合金阴极电泳涂层耐磨性的影响 |
| Effect of SiO2 on the Abrasion Resistance of E-coatings on Magnesium Alloy |
| 投稿时间：2015-04-02 修订日期：2015-07-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2015.07.006 |
| 中文关键词: 镁合金 阴极电泳涂层 SiO2 硅烷改性 耐磨性 |
| 英文关键词:magnesium alloy cathodic electrophoretic coating SiO2 silanizing modification wear resistance |
| 基金项目: |
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| Author | Institution |
| ZHU Ruan-li | 1. Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China;2. Beijing Key Laboratory for Corrosion Erosion and Surface Technology, Beijing 100083, China |
| ZHANG Jin | 1. Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China;2. Beijing Key Laboratory for Corrosion Erosion and Surface Technology, Beijing 100083, China |
| GAO Shuai | 1. Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China;2. Beijing Key Laboratory for Corrosion Erosion and Surface Technology, Beijing 100083, China |
| NI Na | 1. Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China;2. Beijing Key Laboratory for Corrosion Erosion and Surface Technology, Beijing 100083, China |
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| 中文摘要: |
| 目的 提高镁合金有机涂层的耐磨性能。 方法 用 KH450 硅烷改性 SiO2 粉体,并充分分散于电泳漆中。 用 KH460 硅烷预处理镁合金表面,并阴极电泳复合涂层。 通过铅笔硬度测试、摩擦磨损实验、画圈附着力测试、NMP (N 甲基吡咯烷酮) 试验和 Machu 试验,分别评价阴极电泳涂层的硬度、耐磨性能、附着力、抗 NMP 溶胀性能和耐蚀性,并通过扫描电子显微镜和光学显微镜对磨痕形貌进行分析。结果 在镁合金用 KH460 预处理的前提下,添加 SiO2 粉体使涂层硬度由 4H 上升为 5H,同时也提高了涂层的耐蚀性,并且涂层的附着力保持为 1 级,抗 NMP 溶胀性能仍>120 h。 在预处理镁合金基体上制得的原漆涂层和添加纳米 SiO2 的涂层耐磨性较好,磨痕深度与涂层厚度的比值分别为 0. 47 和 0. 475,摩擦系数均低于 0. 4;在未预处理镁合金基体上制备的原漆涂层和在预处理镁合金基体上制备的添加微米SiO2 的涂层耐磨性较差,磨痕深度与涂层厚度的比值分别为 0. 665 和 0. 673,摩擦系数均大于 0. 7。 四种涂层磨损破坏的机制主要为疲劳破坏。 结论 SiO2 粉体的加入可以有效提高涂层的耐蚀性和铅笔硬度,同时不降低涂层的附着力和抗 NMP 溶胀性能。 用硅烷对镁合金进行预处理,向电泳漆中添加硅烷处理的纳米 SiO2,可有效提高阴极电泳涂层的耐磨性。 |
| 英文摘要: |
| Objective To improve the abrasion resistance of organic coating on magnesium alloys. Methods In this paper, SiO2 powders were modified with KH450 silane and dispersed in electrophoretic paint. The surface of magnesium alloys was modified by KH460 silane,and then composite cathode electrophoresis coatings were prepared on it. The pencil hardness test, friction and wear test, circle adhesion method,NMP (n methyl pyrrolidone) test and Machu test were taken to value the hardness, wear resistance, adhesion, anti-swelling properties of NMP and corrosion resistance of electrophoresis cathode coatings, respectively. Their morphol- ogies were studied by SEM and optical microscopy (OM). Results The pencil hardness of the coating,which was prepared on the magnesium alloy modified with KH460, was improved from 4H to 5H by adding SiO2 powders and the corrosion resistance was also increased. And their adhesion and anti-swelling properties of NMP were still kept at 1 class and >120 h respectively. The original coating and the coating containing Nano SiO2 powder, both prepared on the magnesium alloy modified with KH460, had good wear resistance, and their ratios of wear scar depth and coating thickness were 0. 47 and 0. 475 respectively, their friction coefficients were lower than 0. 4. The coating prepared directly on magnesium alloy and the coating containing Micron SiO2 powder prepared on the magnesium alloy modified with KH460 had poor wear resistance, and their ratios of wear scar depth and coating thickness were 0. 665 and 0. 673 respectively, friction coefficients of them were higher than 0. 7. The mainly wear failure mechanism of the four coatings was fatigue failure. Conclusion The addition of SiO2 powder can improve the corrosion resistance and pencil hardness of coatings effectively, and did not decrease adhesion and anti-swelling properties of NMP. The pretreatment of magnesium alloy with silane and the addition of Nano SiO2 in the electrophoretic paint can improve the wear resistance of coating. |
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