Effect of different Ni concentration on the corrosion and friction properties of WC-hNi/SiC pair lubricated with seawater. (January 2022)

• Record Type: Journal Article
• Authors: Zhai, Xuan; Ji, Hui; Nie, Songlin; Yin, Fanglong; Ma, Zhonghai
• Is Part Of: International journal of refractory metals & hard materials. Volume 102(2022)
• Publication Date: 2022-01
• Subjects: Cermet -- Nickel -- Corrosion resistance -- Tribological performance -- Seawater lubrication; Heat resistant alloys -- Periodicals; Refractory materials -- Periodicals; Metallography -- Periodicals; Alliages réfractaires -- Périodiques; Matériaux réfractaires -- Périodiques; Métallographie -- Périodiques; Heat resistant alloys; Metallography; Refractory materials; Periodicals; Electronic journals; 669.73
• DOI: 10.1016/j.ijrmhm.2021.105727
• Languages: English
• ISSNs: 0263-4368

Abstract

Abstract: The cemented carbides have been gradually applied for marine equipment due to their high wear resistance, while the corrosive impact of seawater has a considerable effect on its wear performance. In this paper, the effect of Ni concentration on the resistance to corrosion, tribological properties, and microstructure of the cemented carbides based on tungsten carbide (WC) with metal binders sliding against silicon carbide (SiC) in seawater was investigated. The results showed that Ni element has a positive effect on the resistance to corrosion of cermet WC, and the resistance to corrosion is the best when the concentration of Ni element is 9% (WC-9Ni). In addition, the coefficient of friction (COF) of the WC-hNi/SiC tribopair first decreased and then increased with the increase of Ni concentration, and the quite low steady COF of WC-9Ni is observed. The wear mechanism of the WC-hNi balls is mainly abrasive wear, and the corrosion wear is mild. Furthermore, the wear rate of WC-9Ni is the lowest at different rotational speeds, which has great application potential in seawater hydraulic components. Highlights: The corrosion resistance of WC-hNi improves first and then declines with the increase of Ni. The increase of Ni boosts the fracture toughness of WC-hNi but weakens the hardness. A tribological film appears between the wear surface of WC-hNi/SiC in seawater. The corrosion resistance and tribological properties of WC-9Ni/SiC are excellent in seawater.