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| AZ91D镁合金Ni-W-P多层化学镀层的摩擦磨损及耐腐蚀性能 |
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刘静1, 张涛2, 张曰涛3, 邵亚薇3, 孟国哲3, 王福会2
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1.武汉科技大学, 耐火材料与冶金国家重点实验室, 湖北省冶金工业过程系统科学重点实验室, 武汉 430081;2.东北大学 沈阳材料科学国家实验室, 沈阳 110819;3.哈尔滨工程大学 超轻材料与表面技术教育部重点实验室, 哈尔滨 150001
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| 摘要: |
| 采用多层化学镀工艺在AZ91D镁合金表面成功制备了Ni-W-P多层化学镀层。通过XRD、SEM、摩擦磨损实验以及电化学分析测试等方法，对比研究了普通单层化学镀试样与多层化学镀试样的显微结构、摩擦磨损性能以及耐腐蚀性能。结果表明：多层化学镀层的摩擦因数、维氏硬度及磨损速率与单层化学镀层大体相当，分别为0.33、933 HV和1.46 mg/Km，保留了单层化学镀层优异的耐磨损性能。此外，多层化学镀层的孔隙率较单层化学镀层降低了2个数量级，涂层更为致密。与普通单层化学镀层相比，多层化学镀层的耐蚀性能显著提高，其腐蚀电位和击破电位分别提高了168和209 mV，钝化电流密度由4.212 μA·cm−2降低至1.306 μA·cm−2。因此，多层化学镀层有望成为AZ91D镁合金更有前景的耐磨耐蚀防护涂层。 |
| 关键词: 多层化学镀 Ni-W-P镀层 摩擦磨损性能 耐蚀性能 |
| DOI：10.11933/j.issn.1007-9289.20190225001 |
| 分类号:TG178 |
| 基金项目:国家自然科学基金(51601137) |
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| Friction, Wear and Corrosion Resistance of Multi-layer Electroless Ni-W-P Coating on AZ91D Magnesium Alloy |
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LIU Jing1, ZHANG Tao2, ZHANG Yuetao3, SHAO Yawei3, MENG Guozhe3, WANG Fuhui2
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1.Hubei Province Key Laboratory of Systems Science in Metallurgical Process, State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China;2.Shenyang National Laboratory for Materials Science, Northeastern University, Shenyang 110819, China;3.Institute of advanced marine materials, Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, Harbin Engineering University, Harbin 150001, China
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| Abstract: |
| The multi-layer Ni-W-P electroless coating was successfully prepared on surface of AZ91D magnesium alloy. Microstructure, friction, wear and corrosion resistance of both the normal as-plated and multi-layer coatings were investigated comparatively by XRD, SEM, friction and wear tests, and electrochemical experiments. Results show that the wear coefficient, Vickers hardness and wear rate of multi-layer coating are still keeping the same as those of as-plated coating, which are 0.33, 933 HV和1.46 mg/Km, respectively. The multi-layer electroless coating completely retains the excellent mechanical properties of the as-plated coating. In addition, the porosity of multi-layer coating is two orders of magnitude lower than that of the ordinary as-plated coating, signifying a denser coating for multi-layer electroless coating. Comparing with the as-plated coating, the corrosion resistance of multilayer coating is improved significantly. The corrosion potential (Ecorr) and breakdown potential (Eb) of multi-layer coating are increased by 168 mV and 209 mV respectively, and the passivation current density (icorr) is reduced from 4.212 to 1.306 μA·cm−2. Therefore, multi-layer electroless coating is expected to be a more promising wear-resistant and corrosion-resistant coating for AZ91D magnesium alloys. |
| Key words: multi-layer electroless Ni-W-P coating friction and wear resistance corrosion resistance |