Performance analysis of multifunctional modified coatings on surface of 30CrMnSiA structural steel
Firstly,six black multifunctional modified coatings were prepared on the surface of 30CrMnSiA steel using different techniques,which were:pure Cr coating,pure Ni coating,pure Zn coating and Zn-Ni composite coating were prepared using electroplating technology,LTN+O composite coating was prepared using low-temperature nitriding+oxidation(LTN+O)composite technology,and PVD coating was prepared using physical vapor deposition(PVD)technology.Subsequently,microstructure of the black multifunctional modified coatings was characterized by X-ray diffraction and scanning electron microscopy,and their mechanical properties and corrosion resistance were tested using a microhardness tester,a ball disc friction and wear tester and an electrochemical workstation.The results show that the black multifunctional modified coatings can be successfully prepared on the surface of the 30CrMnSiA steel using electroplating,low-temperature nitriding+oxidation composite and PVD deposition techniques.In terms of hardness,the PVD coating has the highest hardness,reaching 1610 HV0.05.In terms of friction and wear performance,compared to the 30CrMnSiA steel substrate,the friction coefficient of the black multifunctional modified coatings has slightly increased,except for the pure Ni coating,the wear resistance of other modified coatings is better than that of the 30CrMnSiA steel substrate.In terms of adhesion,the PVD coating and pure Ni coating have the best adhesion,and there are no cracks at the edge of the indentation.In terms of corrosion resistance,compared to the 30CrMnSiA steel substrate,the corrosion resistance of the Zn-Ni composite coating and LTN+O composite coating has been enhanced,while the other modified coatings have decreased.
30CrMnSiA steelmultifunctional modified coatingmicrostructurefriction and wear propertycorrosion resistance
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