目的 表征30CrMnSiA钢锌镍合金/硬铬复合镀层,并研究其耐蚀、耐磨性能等。方法 在30CrMnSiA钢表面分别制备30 μm硬铬镀层、5 μm锌镍合金+30 μm硬铬复合镀层、10 μm锌镍合金+30 μm硬铬复合镀层,通过对镀层形貌、结合力、显微硬度、摩擦磨损、孔隙率、耐蚀性等的测试分析,综合对比评价3种镀层的性能。结果 复合镀层外观及微观形貌与硬铬镀层基本一致,显微硬度较硬铬镀层有极小幅度的下降,但仍高达800HV0.5以上。锌镍合金镀层的存在一定程度改变了复合镀层的磨损形态,但对磨损量的影响有限。锌镍合金镀层的存在使复合镀层的孔隙率降至0,大幅提高了复合镀层的耐蚀性,锌镍合金镀层的厚度越大,其耐蚀性越好。结论 复合镀层除具有硬铬镀层高硬度、高耐磨等优势外,还兼具了锌镍合金镀层高致密、高耐蚀的特性,具有优异的综合性能及应用前景。
Abstract
The work aims to characterize and study the corrosion and wear resistance of 30CrMnSiA steel zinc nickel alloy/hard chromium composite coatings. 30 μm hard chromium coating, 5 μm zinc nickel alloy+30 μm hard chromium composite coating, and 10 μm zinc nickel alloy+30 μm hard chromium composite coating were prepared on the surface of 30CrMnSiA steel. The performance of the three coatings was comprehensively compared and evaluated by testing and analyzing their microstructure, adhesion, microhardness, wear amount, friction coefficient, porosity, and corrosion resistance. The appearance and microstructure of the composite coating were basically consistent with those of the hard chromium coating, and the microhardness had a slight decrease compared with the hard chromium coating, but still reached over 800HV0.5. The existence of the zinc nickel alloy coating changed the wear morphology of the composite coating to a certain extent, but its impact on the wear amount was limited. The presence of the zinc nickel alloy coating reduced the porosity of the composite coating to 0, greatly improving the corrosion resistance of the composite coating. The thicker the zinc nickel alloy coating, the better its corrosion resistance. Composite coatings not only have the advantages of high hardness and wear resistance of hard chromium coatings, but also possess the characteristics of high density and high corrosion resistance of zinc nickel coatings. They have excellent comprehensive performance and application prospects.
关键词
硬铬镀层 /
锌镍合金镀层 /
复合镀层 /
耐蚀性 /
硬度 /
摩擦磨损
Key words
hard chromium coating /
zinc nickel alloy coating /
composite coating /
corrosion resistance /
hardness /
friction and wear
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