Preparation of Al coatings by electro-explosive spray deposition

doi:10.13251/j.issn.0254-6051.2023.07.043

Abstract

Abstract: A method for preparing Al coating by tape-loaded wire-confined electric explosion method was proposed. Polyethylene tape as a carrier was used to load Al wire and to send it automatically and continuously into the explosion cavity to explode and prepare Al coating, and then the Al coatings under different process parameters were investigated. The results show that when the initial charging voltage of energy storage capacitor is 9.375 kV and the deposition distance is 26 mm, the surface of the coating is dense and uniform, and the deposition efficiency is relatively high (about 51%), the surface roughness R_a of the coating is reduced from 2.51 μm to 1.29 μm, the maximum hardness of the layer is 116.8 HV and the thickness is about 200 μm. The coating and the substrate are typical metallurgical bonding. By the bending test carries out according to the national standard GB/T 5270—2005 “Metallic coatings on metallic substrates—Electrodeposited and chemically deposited coatings-Review of methods available for testing adhesion”, the result shows that there is no tearing, peeling or debonding between the coating and the substrate, which indicates a good adhesion strength between the coating and the substrate. It is concluded that the preparation of Al coating can be successfully realized by the method of restrained electric explosion with carrier wire.

Key words: load wire restrained electric explosion method, Al coating, bonding strength

CLC Number:

TG174
TG146

Zhou Yi, Zhu Liang, Duan Jingbang, Zhang Aihua, Zhou Hui, Yan Weiliang. Preparation of Al coatings by electro-explosive spray deposition[J]. Heat Treatment of Metals, 2023, 48(7): 259-265.

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