Home Kovove Materialy-Metallic Materials 2011 Metallic Materials Vol. 49 (2011), no. 4, pp.279-285

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Metallic Materials Vol. 49 (2011), no. 4, pp.279-285

Title: Effect of heat treatment on the structure and properties of electrolessly deposited Ni-W-Cr-P alloy coatings on aluminum alloy
Author: Y. JIN., J. FAN, K. MOU, X. WANG, Q. DING, Y. LI, CH. LIU

Abstract: Ni-W-Cr-P alloy coatings were prepared by electroless deposition on Al9Si compound. The effect of heat treatment on the structure and property of prepared coatings was validly investigated. XRD analysis showed that the as-deposited coatings were Ni-W-Cr-P solid solution. Interestingly, the Ni3P phase was observed in the samples annealed at 400 °C, meanwhile, the heat treatment at 500 °C process resulted in the formation of Ni3P, Cr1.12Ni2.88 and Al0.983Cr0.017 phases. Two brand new (AlSi) 7Ni3 and Al3Ni2 phases were identified in the coatings annealed at 600 °C. The experimental results reveal that the as-deposited Ni-W-Cr-P alloy coatings exhibit higher microhardness and better corrosion resistance comparing with those of as-deposited Ni-P and Ni-W-P coatings. At higher annealing temperature, the microhardness of the Ni-W-Cr-P alloy coatings increased, got to the maximum value at 500 °C, and decreased slightly for the samples annealed at higher temperature. It is worth noting that the corrosion resistance was also remarkably improved by heat treatment.

Keywords: electroless deposition, Ni-W-Cr-P alloy coatings, heat treatment, phase transformation behavior, microhardness, corrosion resistance
Year: 2011, Volume: 49, Issue: 4 Page From: 279, Page To: 285

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