Title: Effect of Al Content on Electrochemical Corrosion Behavior of Arc Sprayed Zn-Al Coatings
Abstract: Cored wire and high velocity arc spraying(HVAS) techniques were used to produce Zn-Al composite coatings with different Al contents(15.9%Al,21.1%Al and 30.1%Al).Characterizations of structure and composition of the coatings were examined with some advantage equipments such as scanning electron microscope(SEM) coupled with energy dispersion spectroscope(EDS),and X-ray diffractometer.The electrochemical corrosion behaviors of the Zn-Al coatings dipped in 5% NaCl solution were also investigated.The results show that there is no obvious difference of the microstructure between the three kinds of Zn-Al coatings.A typical laminar and dense structure was performed for all the coatings,the porosity of which is lower than 3%.The coating/substrate bonding strength is higher than 11 MPa.Moreover,the bonding strength increases slightly with the increase of Al content.As the corrosion time increased,the corrosion electric potential and corrosion current of the Zn-15.9Al and Zn-21.1Al coatings fluctuates to some degree,while for the Zn-30.1Al coating,the corrosion electric potential is keeping increase and the corrosion current is keeping decrease,which manifests a higher electrochemical corrosion resistance is obtained for this coating.
Publication Year: 2011
Publication Date: 2011-01-01
Language: en
Type: article
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Cited By Count: 3
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