Electrodeposition Mechanism of Zn‒Ni‒Mn Alloy at Different Time Intervals

Resumo

Mechanism of electrodeposition and stripping of Zn‒Ni‒Mn alloys deposited at different time intervals from aqueous sulfate media were investigated. The corrosion properties of coatings on steel substrate were studied by using different techniques. It might have been established that the attained Zn‒Ni‒Mn alloy exhibits a superior corrosion resistance at low plating times. Also, the ternary Zn‒Ni‒Mn alloy shows finer-grain size, more homogeneous, more uniformity, adherence, hardness, and compactness with respect to the alloy electrodeposited at high plating times. Alloys of the high content of Ni have been obtained at very low deposition times indicating that the initial layer of alloy plating is nickel, as the more noble metal than Zn or Mn, which deposits preferably during the first few seconds. As a result, the coatings obtained at low deposition times have more noble corrosion potentials than those obtained at high deposition times.