SURFACTANT INFLUENCE ON ZN-NI ALLOY PLATING FORM SULFATE SOLUTIONS

摘要

In response to growing needs for improved corrosion resistance in the steel parts of autombiles and aircraft, electroplating of zinc-nickel alloys is being applied in place of pure zinc plating. Experiments were undertaken to determine the dependence of zinc-nickel alloy plating electrodeposition and surface morphology form sulfate solutions on surfactants. Cathode current density, surfactant types ,and amounts in the baths were found to strongly influence deposit composition ,surface morphology, and crstal structure. Despite identical plating conditions, dodecyltrimethylammonium chloride (DTAC) addition form 5 x10~-5 to 1 x10~-4 mol/L decreases the deposit's nickel content, but poly-oxyethylenelaurylamine (POELA) addition at 5 x10~-3 mL/L increases the deposit's nickel content. Anomalous codeposition is greatly accelerated by adding DTAC, but adding POELA helps ameliorate anomalous codeposition.