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0.05mmol/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1.5g/L纳米WC与7g/L纳米PTFE乳液的复合镀层耐磨损性能最佳;含1g/L纳米WC与5g/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。
The defects of composite coatings with a type of nanoparticle were existed. In this work, Ni-WC/PTFE nano- composite coatings were prepared by electro-brush plating on 45 steel surfaces. The surface topography and microstruc- ture were observed by SEM, the dry friction and wear properties wear measured by ball on disc wear tester, and the cor- rosion behaviors of coatings were investigated by 0.05 mmol/L sulfuric acid solution （pH=4）. The results show that the nanopartieles can fill up the vacancy among particles and make the coating surfaces more flat and smooth. The wear and corrosion behaviors of Ni-WC/PTFE nano-composite coatings are better than the pure nickel coating and 45 steel be- cause 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 Ni- WC/PTFE nano-composite coatings are respectively adhesion wear, delamination wear and abrasive wear, respectively.
出处
《中国表面工程》
EI
CAS
CSCD
北大核心
2015年第5期9-15,共7页
China Surface Engineering
基金
江西省自然科学基金(20151BAB206038)
