Electroplating solution for cyanide-free electroplating of tin bronze for iron and steel parts and its preparation method and electroplating method

Abstract

The invention discloses a cyanide-free tin-bronze electroplating solution for steel parts, and a preparation method and an electroplating method thereof, and relates to the technical field of tin-bronze electroplating. The tin-bronze electroplating solution comprises 30-45 g / L of copper sulfate, 3-5 g / L of tin sulfate, 120-150 g / L of sodium thiosulfate; 10-20 g / L of R-binaphthol, 10-20 g / L of potassium sodium tartrate, 30-50 g / L of buffering agents and 10-15 g / L of antioxidants according to the mass concentration; and the cyanide-free tin-bronze electroplating solution for the steel parts adopts water as solvents. The invention further discloses the preparation method and the electroplating method of the cyanide-free tin-bronze electroplating solution for the steel parts. The cyanide-freetin-bronze electroplating solution for the steel parts, prepared with the above preparation method, is used for electroplating according to the electroplating method provided by the invention; coatings obtained by electroplating are distributed evenly and smoothly, and are large in thickness and high in glossiness; and the adhesive force between the coatings and the substrate of the steel parts isimproved obviously, and the electroplating solution, and the preparation method and an electroplating method thereof have wide application prospects.

Description

technical field [0001] The invention relates to the technical field of tin-bronze electroplating, in particular to an electroplating solution for cyanide-free electroplating tin-bronze on iron and steel parts, a preparation method and an electroplating method. Background technique [0002] Since the electroplating solution for cyanide-free tin-bronze plating of steel parts generally uses highly toxic cyanide as a complexing agent, it has been replaced by a safer and more environmentally friendly electroplating solution for cyanide-free tin-bronze plating of steel parts. [0003] Patent CN104928735 discloses an electroplating solution for cyanide-free tin-bronze plating of iron and steel parts, which includes: Cu 2+ 12-17g / L, potassium pyrophosphate 240-280g / L, Sn 2+ 1.5-2.5g / L, disodium hydrogen phosphate or dipotassium hydrogen phosphate 30-50g / L, sodium citrate 5-10g / L, nitrilotriacetic acid 30-40g / L, the iron and steel parts of the invention are cyanide-free electroplate...

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Problems solved by technology

[0003] Patent CN104928735 discloses an electroplating solution for cyanide-free tin-bronze plating of iron and steel parts, which includes: Cu 2+ 12-17g / L, potassium pyrophosphate 240-280g / L, Sn 2+ 1.5-2.5g / L, disodium hydrogen phosphate or dipotassium hydrogen phosphate 30-50g / L, sodium citrate 5-10g / L, nitrilotriacetic acid 30-40g / L, the iron and steel parts cyanide-free electroplated tin bronze of the invention The electroplating solution is used in conjunction with the ultra-low concentration copper pyrophosphate pre-copper plating bath, and the pre-plating copper is firstly treated, and then the electroplating solution of the present invention is used for formal electroplating, which can prevent steel parts from entering the pyrophosphate system electroplating solution Copper replacement occurs in the medium, which improves the bonding force between the coating and the steel substrate, but the coating after electroplating using the above-mentioned electroplating solution for cyanide-free tin bronze is not uniform and smooth, and the coating is relatively thin, that is to say, the electroplating solution has deep plating ability and Poor throwing ability

[0004] Up to now, there is no cyanide-free electroplating tin-bronze electroplating solution for iron and steel parts that can better improve the deep plating ability and throwing ability on the market, which has greatly affected the popularization and application of this type of safe and environmentally friendly electroplating solution. Therefore, It is an urgent problem to be solved in the industry to prepare a plating solution for cyanide-free tin-bronze plating of iron and steel parts with good deep plating ability and throwing ability

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