Ni-based alloy coatings were prepared by hot dipping on plain steel substrates successfully.The coated plain steel was heat treated to improve the bonding strength of interfaces between the coatings and the substrates.The microstructure and the mechanical properties of the interface were investigated before and after heat treatment.It is shown that after heat treatment,precipitates on the side of the coating are larger than those before heat treatment.Noncontinuous lump iron borides are found in the interfa...