Abstract
The Monel alloy coatings are prepared by high velocity arc spraying with different spraying parameters. The microstructure of Monel alloy coating is investigated by scanning electron microscopy, chemical composition is measured by energy dispersive X-ray spectroscopy and the phase composition is tested by X-ray diffraction. The results show that there are little differences in microstructure among coatings. The coatings are compact, and sprayed particles have adequate deformation in the coating. The coatings are composed of Ni–Cu infinite dissolved phase and NiO phase. The coatings have high oxygen content, which should exceed 8%. The oxygen content decreases with the increase in arc voltage from 28 to 33 V. The average bonding strength of the coatings increases with the increase in arc voltage. The maximal bonding strength is 24·33 MPa. Monel coating has better corrosion resistance capability than pure aluminium coating.
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