以45号钢为基体,采用电刷镀制备了Cr-CNTs复合镀层。通过X射线衍射仪（XRD）、扫描电镜（SEM）、扫描电子显微镜附带能谱仪（EDS）等技术对镀层的晶粒尺寸,截面与表面形貌及CNTs在镀层表面的分布进行了表征。此外,利用显微硬度计、电化学工作站、磨损试验机等仪器对镀层的硬度、抗腐蚀性、耐磨性等进行了测试。研究结果表明：Cr-CNTs复合镀层组织致密无明显缺陷,CNTs弥散分布于镀层中,在胞状组织的交界处出现了富集;适量CNTs的加入在一定程度上细化了镀层的晶粒;在CNTs弥散强化和细晶强化等作用下,复合镀层的硬度提高了23.8%,腐蚀速率降低了49.2%,而且耐磨性能也得到了显著的改善。
Cr-CNT composite coating was prepared on steel 45 substrates by brush plating. X-ray diffractometry （XRD） and scanning electron microscopy （SEM） were employed to investigate the grain size and morphology of the coating. Energy dispersive spectrometry （EDS） was used to analyze the distribution of CNTs in the coating. In addition, hardness, corrosion resistance and wear resistance of the coating were also tested with micro-hardness tester, electrochemical workstation and wear tester. Results indicated that the composite coatings present compact structure without obvious defects. CNTs disperse in the coating and concentrated on the boundaries of the cell structure. The addition of CNTs led smaller grain size. Strengthened by fine crystal intensification and dispersion intensification of CNTs, micro-hardness of the composite coatings increased by 23.8% and corrosion rate decreased by 49.2%, wear resistance was greatly improved.
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