Title: Comparison of the Corrosion Resistance of Al-Zn-Si-RE and Al-Zn Pseudo-alloy Coatings by Arc Spraying
Abstract: Al-Zn-Si-RE coating and Al-Zn pseudo-alloy coating with the same Al content were deposited on mild steel by arc spraying to investigate their corrosion.The corrosion resistance of the two coatings was evaluated by comparing electrochemical measurement technique and being immersed in NaCl solution.Tafel curves of pure Zn,pure Al,and Zn-15 Al coatings and the two coatings were analyzed comparatively.X-ray diffraction technique(XRD),optical microscope(OM)and scanning electron microscope(SEM)were used to study the microstructure and the composition of the corrosion products.Electrochemical measurement was carried out by Tafel and EIS.The results show that the ecorr and the corrosion current density of Al-Zn-SiRE coating are-0.995 Vand 3.319×10-6 A/cm2,Al-Zn-Si-RE coating has relatively higher ecorr,lower corrosion rate and better corrosion resistance,and the reason is that dense corrosion products restrain the corrosion.Different corrosion behaviors of Al-Zn-Si-RE and Al-Zn pseudo-alloy coating are due to the difference of their microstructure and phase structure.Al-Zn-Si-RE coating has better corrosion resistance of NaCl solution.RE in Al-Zn-Si-RE coating is in favor of improving the corrosion resistance of the coating.
Publication Year: 2014
Publication Date: 2014-01-01
Language: en
Type: article
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