Abstract
The significance and theoretical basis of the strengthening process of electrodeposited Co–W–Ti–Al2O3 composite coatings and nitrocarburisation are briefly explained. The conditions of the composite process and the characteristics of the composite heat treated coatings are studied in detail. Co–W–Ti–Al2O3 composite coatings with good characteristics are obtained on steel when the appropriate complex agent and additives are selected and the conditions of the composite electrodeposition process are controlled. The hardness and wear resistance of the composite coatings after nitrocarburising are much better than those of the composite without nitrocarburisation. The hardness of the nitrocarburised Co–W–Ti–Al 2O3 composite is found to decrease gradually from the surface into the internal layer. X-ray diffraction shows that the diffused coating contains a solid solution of cobalt, titanium carbide, titanium nitride, tungsten carbide, tungsten nitride and alumina, together with a little r-(FeCo), when the Co–W–Ti–Al2O3 composite coating is nitrocarburised. SE/514
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
