Preparation of nanocrystalline Ni–Mo and Ni–Mo–ZrO2 coating and investigation of its corrosion resistance and wear behaviors. Issue 24 (15th December 2022)

• Record Type: Journal Article
• Authors: Xu, Chenyang; Li, Baosong; Liu, Zhengwei; Yuan, Ziwei; Zhang, Zhen; Chen, Shengquan
• Is Part Of: Ceramics international. Volume 48:Issue 24(2022)
• Page Start: 37102
• Page End: 37113
• Publication Date: 2022-12-15
• Subjects: Ni-Mo -- Ni–Mo–ZrO2 -- Nanocomposite -- Nanocrystalline -- Electrodeposition -- Electrochemical impedance spectrum; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2022.08.286
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Nanocrystalline Ni–Mo and Ni–Mo–ZrO2 coatings were designed and successfully fabricated via electrodeposition process in direct current mode. Impacts of molybdate and ZrO2 nanoparticles, cathodic current density ( i c ) on surface, structure and performance of Ni–Mo alloy were analyzed. Electrochemical behaviors were evaluated by electrochemical impedance method in sodium chloride solution. A more compact and consistent surface morphology was prepared by introducing molybdate in nickel. Grain sizes of Ni–Mo alloy decreased as molybdate increased from 2 to 6 g L −1, and enlarged as i c increased. After incorporation of ZrO2, the grains initially decreased to 12 nm and later increased to 18 nm. The structure of the deposit is a face-centered cubic phase. With the increase of molybdate content, the preferential Ni (220) crystal plane was changed to oriented (111) plane. The Ni–Mo alloy comprises 91 wt% Ni and 5.4 wt% Mo. R a of Ni–Mo–ZrO2 was 73 ± 4 nm. Ni–Mo alloys obtained at 20 mA cm −2 and 2 g L −1 molybdate possess the best corrosion-resistant behavior. Incorporation of ZrO2 can strengthen electrochemical stability and anti-wear behavior of Ni–Mo alloy. The inclusion of ZrO2 refined the grain size from 18 to 12 nm. The Ni–Mo/ZrO2 coatings electrodeposited under 2–4 g L −1 Na2 MoO4 ·2H2 O, 20–40 mA cm −2, 10–15 g L −1 ZrO2 have excellent wear and corrosion resistance.