Friction and anti-corrosion characteristics of arc sprayed Al+Zn coatings on steel structures prepared in atmospheric environment

Abstract

Al coatings and Al–Zn coatings were prepared on the surface of Q345B steel after shot peening using supersonic arc spraying technology to improve anti-slip and anti-corrosion properties. The SEM, XRD and EDAX were used to detect the surface morphology, coating structure and phase composition of the two coatings. The anti-slip coefficient and anti-wear performance of the two coatings were detected by the anti-slip coefficient detector and the MRTR friction and wear tester, respectively. The anti-corrosion characteristics of the two coatings were obtained by the electrochemical corrosion workstation. The experimental results showed that the thickness of both coatings is 100 μm. The substrate and the coating are mechanically bonded. Under the condition of the test parameters, the anti-slip coefficients of Al coating and Al–Zn coating were 0.717 and 0.823, respectively, satisfying the service requirement of the steel structure. The corrosion potential of the Al–Zn coating was −1.136, which exhibits a good anti-corrosion performance. Under the condition of water, the anti-wear characteristics of Al–Zn were relatively ideal. The wear-resistance of Al–Zn coating is better than that of pure Al coating. In conclusion, Al–Zn coating possesses excellent anti-slip, anti-corrosion and anti-wear characteristics and can be used in large steel structure surface modification.