| 摘要: |
| 针对单一纳米颗粒电刷镀镀层综合性能存在的不足，利用电刷镀技术在45钢基材上制备含纳米WC和PTFE的镍基复合镀层。采用扫描电子显微镜观察电刷镀复合镀层的表面形貌和显微结构，球盘式摩擦磨损试验机测试其干摩擦条件下摩擦磨损性能，在pH=4浓度为0.05 mmol/L的硫酸溶液中进行耐腐蚀性试验。结果表明：在镀液中添加不同含量纳米粒子，可以不同程度填补粒子之间的空缺，使镀层表面平整、光滑；含纳米WC和PTFE镍基复合镀层的耐磨损和耐腐蚀性能强于纯镍基镀层和45钢基体，这是由于纳米粒子细晶强化和弥散强化所致；当含1.5 g/L纳米WC与7 g/L 纳米PTFE乳液的复合镀层耐磨损性能最佳；含1 g/L纳米WC与5 g/L 纳米PTFE复合镀层的耐腐蚀性能较纯镍基复合镀层提高一倍；45钢的磨损机制是粘着磨损，纯镍基镀层的磨损机制是剥层磨损，纳米WC/PTFE镍基复合镀层的磨损机制是磨粒磨损。 |
| 关键词: 电刷镀 镍基复合镀层 纳米WC/PTFE 磨损性能 耐腐蚀性 |
| DOI：10.11933/j.issn.1007-9289.2015.05.002 |
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| 基金项目: |
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| Wear and Corrosion Resistance of Brush Plating Ni-WC/PTFE Nano-composite Coatings |
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LI Xiaobing, LIU Yidong, MA Hao, WANG Yeye, ZHAO Hui, TONG Xianliang, YANG Fan
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a. School of Mechanical Engineering, b. School of Material Science and Engineering, Nanchang University
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| Abstract: |
| The defects of composite coatings with a type of nanoparticle were existed. In this work, NiWC/PTFE nanocomposite coatings were prepared by electrobrush plating on 45 steel surfaces. The surface topography and microstructure were observed by SEM, the dry friction and wear properties wear measured by ball on disc wear tester, and the corrosion behaviors of coatings were investigated by 0.05 mmol/L sulfuric acid solution (pH=4). The results show that the nanoparticles can fill up the vacancy among particles and make the coating surfaces more flat and smooth. The wear and corrosion behaviors of NiWC/PTFE nanocomposite coatings are better than the pure nickel coating and 45 steel because of the nanocrystalline and dispersion strengthening of nanoparticles. The wear performance of the composite coating with 1.5 g/L WC and 7 g/L PTFE is best, and the corrosion resistance of the composite coating with 1 g/L WC and 5 g/L PTFE increases double than the pure nickel coating. The main wear mechanism of 45 steel, pure nickel coating and NiWC/PTFE nanocomposite coatings are respectively adhesion wear, delamination wear and abrasive wear, respectively. |
| Key words: electrobrush plating nickel composite coating nano WC/ PTFE wear behavior corrosion resistance |
