Study on Properties of Al₂TiO₅ Coating on Ti-6Al-4V Titanium Alloy

Abstract:

The Al₂TiO₅ Coating was deposited on Ti-6Al-4V alloy substrate by homemade micro-arc oxidation system. The microstructure of Ti-6Al-4V titanium alloy, the phase of coating, the bonding force of the coating and matrix, sulfuric acid corrosion resistance and high-temperature oxidation resistance were study by inverted microscope model, Xray diffract meter, scanning electron microscopy, the coating adhesion automatic scratch tester, box-type furnace. The results show that the phase of coating is composed of Al₂TiO₅ and Al₂SiO₅, and Al₂TiO₅ .is the main component, the coating surface consists of discharging pit and flange which are unequal in size, rough and overlap and micro-arc oxidation pit diameter increases with the voltage. When micro-arc oxidation voltage is constant, the longer micro-arc oxidation time, the greater the Ti-6Al-4V alloy coating and the substrate binding force. The corrosion resistance of Ti-6Al-4V alloy was improved in sulfuric acid due to micro-arc oxidation; the sulfuric acid corrosion resistance of the coated samples was improved 11 times when the micro-arc oxidation time increased from 5min to 60min. the high-temperature oxidation resistance of Ti-6Al-4V alloy with micro-arc oxidation coatings is higher than Ti-6Al-4V alloy without micro-arc oxidation coating.

• Periodical: Key Engineering Materials (Volumes 575-576)
• Pages: 348-351
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.575-576.348
• Online since: September 2013
• Authors: Nian Suo Xie, Jin Wang
• Keywords: Al₂TiO₅ Coating, Corrosion Resistant, Micro-Arc Oxidation, Surface Morphology, Ti-6Al-4V Titanium Alloy

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