The problem of high-temperature corrosion caused by wood fuel ash produced by the wood biomass combustion apparatus, has arisen from the expanded usage of wood biomass energy in recent years. The purpose of this study is to develop chromium-free composite coating that provides high durability and corrosion resistance against wood fuel ash with cold spray technology.
In this study, fabrication of NiAl intermetallic compound coatings by cold spraying using compressed air is examined. Particle velocity and deposition efficiency were measured to attempt a comparison between compressed air and helium gas. The coating characteristics such as microstructure, micro Vickers hardness and corrosion resistance were evaluated. As a result, a dense NiAl intermetallic compound coating was formed with compressed air by using the powder prepared by that blending Ni-Al mechanically milled powder and Al2O3 powder. Moreover, the coating showed excellent corrosion resistance in the polarization measurements and high temperature corrosion tests.
