Research on corrosion resistance of ship propeller’s coating fabricated by laser

Abstract

A novel method for the additive manufacturing was proposed to fabricate Ni-WC coating. The laser power and scanning speed were 1400 W and 200 mm/min-1, respectively. The microstructure, composition, hardness, friction properties and corrosion resistance were analyzed. The experimental results exhibit the coating’s average hardness is 614.3 HV0.5. It is about 3.1 times higher than the copper substrate. The wear rate of Ni-WC coating is only 9.7×10-5 mm3·N-1·m-1 due to the existence of hard phase and WC reinforced phase. The Ni-WC coating’s corrosion current density is 2.34×10-7 mA·mm-2, which shows a good corrosion resistance than the substrate. The performance of the coating is improved compared with the substrate. The bonding is good without defects.