The Study Of Property And Electrodeposition Behavior Of Binary And Ternary Alloys Of Fe Substrate

Chromium plating is used widely in industry and life as protective and decorative coating,however the toxicity of hexavalent chromium for human body and entironment had drew the attention of pepole.Tungsten alloy empoldered as the substitute of chromium plating had drew wide interest of researchers for decades by the excelent properties,i.e.decorative appearance,high rigidity,high wear Resistance,high thermal Stability and good corrosion resistence.Tungsten alloy get rid of the deleterious element Cr and use citric acid as complex agent.There are no harmful rejectamenta in the production process,so ti is Green Manufacturing Process. Tungsten alloy had already obtained very successful application in heavy machinery industry of petroleum.Tungsten alloy will play a more and more important role in industry and life in future along with the maturity of the technology.In this paper corrosion resistence of Fe-Ni-W alloy with different tungsten content in 3.5wt% NaCl solution was studied.We found that Fe and Ni element codeposition don't obey the anomalous codeposition rule of iron groups metals.For this interesting discovery. We studied the codeposition of Fe-Ni alloy in detail under alkaline condition and discussed the possible mechanism.(1) We obtained Fe-Ni-W alloy coating by changing the content of electrolyte and technical parameters and characterized the surface morphology, structure. Corrosion behavior was investigated by electrochemical and gravimetric tests in 3.5 wt.% NaCl solution at 25℃(2) Under alkaline condition,the codeposition of Fe-Ni alloy was studied in electrolytes adjusted pH by NH3H2O or NaOH respectively.The regular codeposition of Fe-Ni alloy was discoved and studied the electrochemical characteristic.(3)The codeposition mechanism of Fe-Ni alloy was proposed according to the experiment datas and theoretics of electroplating.