Chromium-free manganese-free coarsening liquid for ABS plastic and application method thereof

Abstract

The invention relates to chromium-free manganese-free coarsening liquid for ABS plastic and an application method thereof. With water as a solvent, the chromium-free manganese-free coarsening liquid is mainly prepared from following raw materials with the concentrations through mixing: 1 g / L-30 g / L of ferrous sulfate heptahydrate and 10 mL / L-100 mL / L of hydrogen peroxide. The pH of the chromium-free manganese-free coarsening liquid is 1-7. According to the chromium-free manganese-free coarsening liquid for ABS plastic, no chromic anhydride and no manganese at any valence state are added to thecoarsening liquid. In an acid system, the chromium-free manganese-free coarsening liquid achieves the higher oxidizing ability under the catalytic decomposition effect of H2O2 of Fe2+ so as to conduct effective corrosion on the ABS plastic to complete coarsening. Thus, the bonding force between a follow-up plating layer and a base material is good, and the requirements for electroplating production are met.

Description

[0001] This application is a divisional application of "a chrome-free roughening solution for ABS plastic and its application method". The application number of the original application is 201811428814.X, and the application date is 2018.11.27. technical field [0002] The invention relates to the technical field of roughening liquid, in particular to a chrome-free and manganese-free roughening liquid for ABS plastics and a use method thereof. Background technique [0003] ABS plastic is one of the five general-purpose plastics. It has the advantages of heat resistance, impact resistance, excellent electrical performance, and easy processing. It has excellent comprehensive performance and has good application prospects in the automotive industry, electronic appliances and other fields. China is the largest consumer of ABS plastic in the world, accounting for more than 50%. ABS plastic is a terpolymer formed by copolymerization of acrylonitrile, butadiene and styrene. Styrene...

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Problems solved by technology

These roughening solutions have not been widely used so far, because the potassium permanganate solution is unstable, easily decomposed into manganese dioxide, and the service life of the plating solution is short; the acidic manganese ion system roughening solution needs a high concentration of sulfuric acid, but in the production process Due to the water absorption of the water and sulfuric acid brought in by the pretreatment, the sulfuric acid in the plating solution is easily diluted by water to the minimum concentration required for production and cannot be used any longer; in addition, the treatment results of these roughening solutions are uneven, the binding force is unstable, and in Particle impurities are easy to precipitate during the roughening process, which leads to pitting in the subsequent coating layer, which cannot meet the requirements of mass production.

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