Effect of Sb 2 S 3 doping on the characteristics of pure titanium micro‐arc oxidation coatings

Le résumé fourni par la source

Abstract Scanning electron microscopy, X‐ray diffractometry, X‐ray photoelectron spectroscopy, and electrochemical workstations were used to study the effects of Sb 2 S 3 addition on the surface morphology, phase compositions, and corrosion resistance of pure titanium micro‐arc oxidation ceramic films. The results showed that the addition of an appropriate amount of Sb 2 S 3 could increase the micro‐arc oxidation voltage, improve the micro‐morphology of the micro‐arc oxidation coating surface, reduce the surface roughness, improve the transfer efficiency between matrix Ti 4+ and OH in the electrolyte, promote the film‐forming reaction, and increase the thickness of the prepared coating. During the micro‐arc oxidation process, the Sb element in the form of Sb 2 O 3 entered the coating and combined with anatase TiO 2 , rutile TiO 2 , and other hard phases to enhance the hardness of the coating. The addition of an appropriate amount of Sb 2 S 3 could reduce the self‐corrosion current density of the coating and effectively improve the corrosion resistance of the coating, and the self‐corrosion rate of the coating reached a minimum of 1.253 × 10 −2 mpy when the amount of Sb 2 S 3 added was 4g/L, and the corrosion resistance of the micro‐arc oxidation coating was the best at this concentration.

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