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《Chinese Journal of Engineering》 2017-06
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Process and properties of spray-aluminized coating on cast iron

HU Ning;FAN Zi-shuan;School of Materials Science and Engineering,University of Science and Technology Beijing;  
Aluminum-based coatings were prepared by flame spraying.After remelting and diffusion treatment,the phase,composition,friction and corrosion resistance were analyzed experimentally by using scanning electron microscopy,X-ray diffraction,energy dispersive spectrometer,wear tester.The results indicate that the surface phase consists of Al and FeAl_3,inner layer phase mainly contains FeAl_3 and Fe_2Al_5.The coating has higher micro-hardness than the underlying material,with a maximum of up to HV 950.In an experiment of high-temperature oxidation at 800 ℃ and 900 ℃,the spray-aluminized samples show almost no weight gain,and the antioxidant properties of cast iron improve substantially(by dozens of times).In addition,the samples show excellent wear and corrosion resistance.
【CateGory Index】: TG174.445
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