Post-heat treatment of arc-sprayed coating prepared by the wires combination of Mg-cathode and Al-anode to form protective intermetallic layers

  • Xu R
  • Song G
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Abstract

A Mg-Al intermetallic compounds coating was prepared on the surface of Mg-steel lap joint by arc-sprayed Al-Mg composite coating (Mg-cathode and Al-anode) and its post-heat treatment (PHT). The effect of PHT temperature on the phase transition, microstructure and mechanical properties of the coating was investigated by X-ray diffraction, scanning electron microscope, energy dispersive X-ray spectroscopy, optical microscope and microhardness test. The result shows that the intermetallic compounds layer that is mainly composed of Al3Mg2and Mg17Al12is formed by the self-diffusion reaction of Mg and Al splats in the coating after PHT for 4 h at 430 °C. © 2010 Elsevier B.V. All rights reserved.

Author-supplied keywords

  • Arc spray processing
  • Diffusion
  • Intermetallics compounds coating
  • Post-heat treatment

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Authors

  • Rongzheng Xu

  • Gang Song

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