Study on Complexing Agent of Pulse Electroplating Ni-Cr-Mn Alloy Coating
Ni-Cr-Mn alloy coating was obtained on Q235 steel surface by pulse electroplating. The effects of different complexing agents such as ammonium formate, ammonium citrate and compound complexing agent Aon the composition, deposition rate as well as corrosion resistance of Ni-Cr-Mn alloy coating were investigated by glow discharge spectroscopy and electrochemical work station. The results show that the effects of three different complexing agents on the composition, deposition rate and corrosion resistance of Ni-Cr-Mn alloy coating are similar. With complexing agents content increasing, the contents of Cr and Mn of the coating increases firstly and then decrease, but the content of Ni decreases firstly and then increases, and the deposition rate increase firstly and then decreases. The Ni-Cr-Mn alloy coating prepared in the compound complexing agent Ahas the minimum corrosion current density and the maximum corrosion potential, which is 9. 374 ×10-8 A/cm2 and -0. 288 V, then, the corrosion resistance is better.
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