期刊
RSC ADVANCES
卷 6, 期 36, 页码 30652-30660出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ra01838f
关键词
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资金
- Innovation Program of Shanghai Municipal Education Commission [PE2016097, PE2016068]
- Shanghai Leading Academic Discipline Project [J51503]
- National Natural Science Foundation of China [20976105]
- Shanghai Association for Science and Technology Achievements Transformation Alliance Program [LM201559]
- Shanghai Municipal Education Commission boosting project [15cxy39]
- Science and Technology Commission of Shanghai Municipality Project [14520503200]
- Shanghai Municipal Education Commission (Plateau Discipline Construction Program)
- Shanghai Talent Development Funding [201335]
- Scientific Research Foundation of SIT [YJ2015-35]
The effect of the ultrasound-assisted method on Ni-Mo alloy coatings by direct current (DC) electroformation in a sulphate-citrate bath was investigated with different ultrasound powers. This study focused on the microstructure, molybdenum content, grain size, roughness, micro-hardness and corrosion resistance of the Ni-Mo alloy coatings, which were influenced by the ultrasound parameters. X-ray diffraction results showed that ultrasound modification decreased the grain size of the nanocrystalline alloy coatings. The hardness of the as-plated coatings after ultrasonication was determined by Vickers diamond indentation tests and compared with that of the Ni-Mo coatings in the absence of ultrasound. As a result, the hardness (719 HV) of the former coatings improved significantly. Scanning electron microscopy and atomic force microscopy images showed a smoother coating and a decrease in the surface roughness of the electrodeposited film, as a result of the use of ultrasound. Furthermore, the corrosion resistance behaviour of the coatings was analysed by a Tafel polarisation curve and electrochemical impedance spectroscopic studies in a 3.5 wt% NaCl solution. The ultrasonicated coatings (Ni-Mo) significantly enhanced corrosion resistance (4.1 mu A cm(-2)) compared with those without ultrasound assistance. However, at the maximum ultrasound power (270 W), the molybdenum content, grain size, roughness, microhardness and corrosion resistance of the Ni-Mo alloy coatings all slightly decreased.
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