Abstract:

Pulse plating technology was used to plate fine aluminum powder wrapped with nickel on the surface of A3 carbon steel in nickel sulfate bath. A dense and full covered coating with uniform crystallite size could be obtained. The coating prepared from the pulse plating is better than that prepared from a direct current plating in terms of morphology, structure and mechanical stability. Upon annealing at high temperature, Ni-Al alloy was formed. The alloyed coatings could adhere strongly to the steel substrate and the composite coating shows an enhanced resistance to oxidation at high temperatures.

Key words: Pulse Plating, A3 carbon steel, Heat treating, oxidation kinetics