Corrosion Resistance of Al-Cr Composite Strengthening Layer on the Surface of 45(#) steel

Affiliation of Author(s):材料科学与技术学院

Journal:RARE METAL MATERIALS AND ENGINEERING

Key Words:plasma ion implantation double glow plasma surface metallurgy composite strengthening layer corrosion resistance

Abstract:Aiming at improving the corrosion resistance of 45(#) steel used in maritime works, Al-Cr composite strengthening layer was deposited on the surface of 45(#) steel via a composite technique of plasma ion implantation (PII) and double glow plasma surface metallurgy (DGPSM). The element distribution and phase structure of the Al-Cr composite strengthening layer were investigated via X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), atomic force microscope (AFM), scanning electron microscope (SEM) and energy dispersive spectroscopy (EDS). Polarization curves and electrochemical impedance spectroscopy (EIS) were used to study the corrosion resistance and corrosion mechanisms of the Al-Cr composite strengthening layer, Al implanted layer and 45(#) steel in 3.5 wt% NaCl solution. The results show that the Al-Cr composite strengthening layer reveals the best corrosion resistance. Cr2O3 and Al2O3 form on the surface of the Al-Cr composite strengthening layer as a passive film, and they hinder the corrosion of Cl effectively together with the inner Fe2AlCr and Al8Cr5 phases which have excellent corrosion resistance. The Al implanted layer exhibits moderate corrosion resistance due to the formation of Al2O3 passive film. The substrate of 45(#) steel shows the worst corrosion resistance.

ISSN No.:1002-185X

Translation or Not:no

Date of Publication:2018-10-01

Co-author:Luo Xixi,Zhang Pingze,zky

Correspondence Author:Yao Zhengjun

Date of Publication:2018-10-01