Preparation and Corrosion Resistance Performance Study of AuAl2 Alloy Anodic Oxide Film
The AuAl2 alloy,used as a colored jewelry alloy material,consists of 79％Au and 21％Al,meeting the ratio of 18K gold.Compared to other gold alloy materials for jewelry,it exhibits a vibrant purple color and is wide-ly applied in jewelry inlaying.However,it is susceptible to corrosion from sweat during wear.This paper employs anodic oxidation on the AuAl2 alloy with the aim of forming an Al2O3 oxidation layer on the surface to enhance the corrosion resistance of the AuAl2 alloy.The anodic oxidation process of the AuAl2 alloy after vacuum melting is discussed,and the anodically oxidized AuAl2 alloy is tested using an electrochemical workstation,Scanning E-lectron Microscope(SEM),Atomic Force Microscope,surface contact angle,and Inductively Coupled Plasma Op-tical Emission Spectrometer(ICP)for comparative analysis.The experimental findings demonstrate that when the electrolyte has a pH of 1,a voltage of 5 V,an oxidation time of 300 s,and an oxidation temperature of 30 ℃,the corrosion resistance performance is optimal.The surface roughness of the sample increases after anodic oxidation,and the contact angle changes from hydrophilic to hydrophobic.The anodic oxidation film and the doping of rare earth element Y reduce the release of Al.
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