Microstructure and properties of AC-HVAF sprayed Ni60/WC composite coating

• Published in: Journal of alloys and compounds Vol. 480; no. 2; pp. 254 - 258
• Main Authors: Liu, S.L., Zheng, X.P.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 08.07.2009; Elsevier
• Subjects: AC-HVAF; Applied sciences; Carbides; Coating; Corrosion; Corrosion resistance; Corrosion tests; Cross-disciplinary physics: materials science; rheology; Deposition; Exact sciences and technology; Materials science; Metals. Metallurgy; Methods of deposition of films and coatings; film growth and epitaxy; Microstructure; Ni60/WC coating; Nickel base alloys; Nickel steels; Particulate composites; Physics; Protective coatings; Scanning electron microscopy; Spray coating techniques; Spraying; Stainless steels; Wear resistance; Corrosion resistance; Wear resistance; AC-HVAF; Ni60/WC coating; Microstructure; Tungsten carbide; Scanning electron microscopy; Corrosive wear; Spray coatings; Mechanical properties; XRD; Heat treatments; Stainless steels; Chromium-nickel-molybdenum steels; Corrosion; Composite coating; Morphology; Tribology
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2009.02.028

A Ni60/WC coating was deposited on 0Cr13Ni5Mo stainless steel substrate by the actived combustion-high velocity air fuel (AC-HVAF) technique. The structure and morphologies of the Ni60/WC coating were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM), and the wear resistance and corrosion resistance were studied. The results showed that the AC-HVAF spraying was seen as the pre-eminent process for the deposition of Ni60/WC coating. Due to low particle heating and high particle velocity in the HVAF process, WC phase remain almost unchanged after spraying. The tribological behaviors were evaluated by using a HT-600 wear test rig. Under the same conditions, the worn volume of 0Cr13Ni5Mo stainless steel was 10.43 times more than that of the coating. The wear mechanism was mainly fatigue wear. A series of the electrochemical tests was carried out in a 3.5 wt.% NaCl solution in order to examine the corrosion behavior. Mechanisms for corrosion resistance were discussed.