Improved microstructure and corrosion resistance of nanostructured nickel coating via pulsed jet plating

摘要

This paper reports on the deposition of a fully dense and uniform Ni coating that is designed to improve the corrosion resistance of aeronautical structural alloy 30CrMnSi by application of pulsed jet plating from an additive containing nickel sulphate bath. As the deposition current density changed, the coating microstructure shifted from a cellular-like to a non-cellular one that was observed to have a dense, uniform and smooth surface. In addition, the preferred orientation became the (111) plane when the coating was deposited with an optimum current density of 39·8 A dm~(-2). Deposition of a dense and uniform nickel coating resulted in a significant increase in the corrosion resistance of 30CrMnSi. Significantly, nickel with (111) preferred orientation on 30CrMnSi had a higher corrosion resistance compared with bare 30CrMnSi, a conventional nickel plate coating on 30CrMnSi as well as nickel with (200) preferred orientation on 30CrMnSi.