Metal surface zinc-nickel alloy electroplating solution and electroplating process

Abstract

The invention discloses a metal surface zinc-nickel alloy electroplating solution. The formula of the electroplating solution comprises 20-50 g / L of zinc oxide, 10-20 g / L of nickel sulfate, 120-160 g / L of sodium hydroxide, 10-30 g / L of a complexing agent, 0.5-5 g / L of an additive and 1-5 g / L of a brightening agent, wherein the complexing agent is composed of ammonium citrate, triethanolamine and 1, 3-diamino-2-propanol according to the mass ratio of 1: (1-3): (3-5), the additive is composed of sodium phytate and hexadecyl trimethyl ammonium bromide according to the mass ratio of 1: (3-5), thebrightening agent is composed of saccharin, vanillin, 2-butyne-1, 4-diol and sodium allysulfonate according to the mass ratio of (5-10): (1-3): (3-5): 1. The electroplating solution can provide a bright zinc-nickel alloy coating with refined grains, improves the deep plating capability and dispersion performance of the coating, and is particularly suitable for electroplating of long-tube-shaped workpieces.

Description

technical field [0001] The invention belongs to the field of metal surface treatment, and in particular relates to a metal surface zinc-nickel alloy electroplating solution and an electroplating process. Background technique [0002] Galvanizing is a steel protection method widely used at home and abroad. It has been widely used in shipbuilding industry, machinery industry, aviation, construction, household appliances and many other fields due to its good corrosion resistance and low price. Galvanizing refers to a surface treatment technology that coats a layer of zinc on the surface of metals, alloys or other materials for aesthetics and anti-rust effects. Zinc is easily soluble in acid and alkali, so it is called amphoteric metal. Zinc hardly changes in dry air. The standard electrode potential of zinc is -0.76V, and the standard potential of zinc is higher than that of iron. For steel substrates, zinc coating is an anodic coating. It is mainly used to prevent corrosion ...

AI Technical Summary

Problems solved by technology

However, the deep-plating performance of the electroplated zinc-nickel alloy coating obtained by this method is average, and the electroplating effect for complex-shaped, especially long, tubular workpieces still needs to be further improved.