化学镀Ni-P电镀Ni-Co-Mn复合层力学及耐热腐蚀性能研究

Mechanical Properties and Hot-corrosion Resistance of Composite Coatings with Ni-P Chemical Deposition and Ni-Co-Mn Electropl

摘要:

通过先化学镀后电镀的方法制得“基材-化学镀Ni-P层-电镀Ni-Co-Mn层”的复合层，采用金相观测、纳米压痕、纳米划痕、SEM、EDS等方法研究了镀层的力学性能及耐热腐蚀性能。结果表明，复合层的弹性模量与纳米硬度与电镀层相近，比单一化学镀层略低；复合层与基材结合得较好，复合层中两种镀层亦结合得较好，结合力超出纳米划痕的最大测量值28N，比单一电镀层与基材的结合力大；化学镀层与电镀层的组织致密度较高，耐热腐蚀性及抗氧化性较好，且化学镀层稍优于电镀层；先化学镀后电镀的工艺比单一电镀的结合牢固，比单一化学镀的镀层生长速率要快，且热腐蚀后与基材的结合力提升很多。

Abstract:

The composite coatings of Ni-P chemical deposition and Ni-Co-Mn electroplating were made by the process of first Chemical deposition and last electroplating, and the mechanical properties and hot-corrosion resistance of the coatings were studied through the methods of metallographic observation, nanoindentation, nano-scratch, SEM, and EDS. The results show that the elastic modulus and nano-hardness of the coatings are similar with the electroplating, slightly lower than the chemical deposition. The coatings and substrate is combined well, and the two layers, chemical deposition and electroplating also with good binding force exceeds the maximum measurement value of nano-scratch, while larger than the one between a single electroplating and substrate. The tissue density of the chemical deposition and the electroplating is higher than the substrate, also the anti-hot corrosion resistance and oxidation resistance, and chemical deposition shows better than electroplating. First chemical deposition and last electroplating process is with better binding force than single electroplating process before and after hot corrosion, and is with faster coating growth rate than single chemical plating.