Zinc-nickel alloy electroplating solution

Abstract

The invention discloses a zinc-nickel alloy electroplating solution. The zinc-nickel alloy electroplating solution comprises 2-20g / L of zinc oxide, 60-200g / L of sodium hydroxide, 5-40g / L of nickel sulfate, a complexing agent, a brightener and deionized water. When the solution is used, the current density is 2-4A / dm<2>, the solution is used at an anode, and the temperature is 10-30DEG C. The solution is characterized in that the solution also comprises triethanolamine, and the complexing agent is 50-70ml / L of sodium dodecyl benzene sulfonate; and the brightener is 4-6ml / L of an amine and epoxy compound condensate. The zinc-nickel alloy electroplating solution has the advantages of good stability and good coating performance.

Description

technical field [0001] The invention relates to an alloy material electroplating solution, in particular to an electroplating zinc-nickel alloy plating solution. Background technique [0002] At present, there are mainly two types of zinc-nickel alloy plating solutions commonly used. One is a weakly acidic chloride plating solution, using nickel salt and zinc salt as the main salt, chloride as the conductive salt, and boric acid as the buffer. This plating solution is characterized by high cathode current efficiency (above 95%), fast deposition speed, low coating brittleness, easy sewage treatment, and nickel content in the coating is mostly in the range of 11% to 15%, but the dispersion ability of the plating solution and poor coverage. The other is alkaline zincate plating solution, the main salt is generally zincate and nickel salt, which is characterized by high dispersion and covering ability of the plating solution, uniform and bright coating, wide range of current d...

AI Technical Summary

Problems solved by technology

[0007] 1. The solution is unstable: due to the absence of additives, the cathode polarization of the plating solution is poor

Simultaneously, because the content range of complexing agent is relatively high, anode dissolution is accelerated, and the balance of zinc and nickel ions in the plating solution is destroyed, so that the solution of the plating solution is unstable, and granular substances are often precipitated, and the solution is turbid, resulting in The film layer is relatively rough

[0008] 2. Poor dispersing ability: The parts or samples obtained by electroplating with this plating solution often have no film layer at the contact point between the part and the hanger or in the deep recess

[0009] 3. The performance of the coating is poor: the surface of the parts obtained by electroplating with this plating solution is not bright, rough and has low corrosion resistance (salt spray test time is generally 500H)