High-temperature oxidation and immersion corrosion propertiesof Al3Ti and TiC/Al3Ti laser cladding coatings
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Abstract:
Intermetallic compound Al3Ti coating and TiC particle-reinforced Al3Ti matrix composite coating are prepared on the surface of aluminum alloys by laser cladding. The high-temperature oxidation and immersion corrosion behaviors of those two coatings are compared. The results show that the coatings exhibit minimal oxidation mass gains during the cyclic oxidation close to the melting point of the substrate(600℃) for 70 h, providing excellent protection to the aluminum alloys. When oxidized at 900℃, the coatings show significant mass gains in accordance with the parabolic law, and the oxidation resistance of the composite coating is lower than that of the Al3Ti coating. After immersed in 3.5 wt% NaCl solution for 15 days, the composite coating presents the less corrosion attack for hard Al3Ti and TiC particles impede the growth of pitting, and both coatings improve the corrosion resistance of the aluminum alloys.
