An Investigation Of Electroplating Technology Of Low Hydrogen Embrittlement Zinc-Nickle Alloy Coating

The electrodeposition of a metallic coating on to high strength steel introduces the possibility that the steel fail by hydrogen embrittlement. This paper describes a fundamental study of the hydrogen uptake resulting from electroplating with zinc-nickel alloy in chloride electrolyte. The influence of various of parameters for example the solution temperature, PH and cathode current density on the nickel content in the electrodeposited zinc-nickel alloy coating have been investigated. Properties of the Zn-Ni alloy deposit were determined with the methods of the notch tensile and the neutral salt spray. And the satisfactory alloy deposit can be obtained at 30℃ and cathode current density 2A/dm2 from the chloride bath.Evaluated of hydrogen uptake and permeation in Zinc-Nickel alloy and metals by an electrochemical technique. Zinc-nickel alloys have been obtained from two electroplating baths, which present a low hydrogen embrittling. And the results were tested by the notched tensile test.Determining the presence of escape channels as well as other microstructural features enables one to control plating processes to assure the production of articles that exhibit low hydrogen embrittlement.The predominant phase found in the deposit was gamma-Ni5Zn21 phase. The microstructure of cross-sections of the deposits could improve the corrosion resistance of the alloy.In the deposition of Zn-Ni alloy, the predominant presence of Zinc is result of anomalous codeposition.