Research on Friction and Wear Properties under High Loading Force and Corrosion Resistance of WC-10Co4Cr Coatings AITranslate

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Chinese Library Classification Number:TG174.4[金属学及工艺—金属表面处理]

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Spraying powders with WC particle sizes of 1μm and 0.5μm were used to prepare two kinds of WC-10Co4Cr coatings.By means of testing metallographic microstructure,friction coefficient,wear scar morphology and potentiodynamic polarization curves of WC-10Co4Cr coatings,friction and wear properties of the coatings under high loading force of 1000 N were studied,and corrosion resistance of the coatings in sodium chloride solution with different mass fractions was investigated.The results indicate that compactness,microhardness and fracture toughness of the coating prepared by spraying powder with smaller WC particle size are all higher than those of the coating with larger WC particle size.When loading force is 150 N,wear scars of these two coatings are shallow and their difference in wear volume is small,so it is hard to compare their wear resistance.Under loading force of 1000 N,wear resistance of the coating with smaller WC particle size is obviously higher.With the increase of friction time,the friction coefficient of the coating surface gradually decreases,and the wear mechanism is mainly abrasive wear.The friction coefficient of the coating with larger WC particle size increases with friction time,and the wear mechanism of the surface includes adhesive wear and abrasive wear.As mass fraction of sodium chloride in solution increases from 1%to 10%,corrosion potential of the coating with smaller WC particle size is higher than that of the coating with larger WC particle size,and the corrosion resistance of the former coating is better.When the mass fraction of sodium chloride is 3.5%,difference in corrosion potential between these two coatings is highest,and the distinction in corrosion resistance is most apparent.