Cyanide-free composite electroplating method for plating RE-TiO2-Ag layer on surface of steel substrate

A technology of substrate surface and composite plating, applied in coatings, electrolytic coatings, etc., can solve the problems of insufficient coating purity, inconvenient management and operation, poor cyanide-free silver plating dispersibility, etc., and achieve the effect of simple electroplating process

Active Publication Date: 2017-10-27
长江润发(江苏)薄板镀层有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, silver plating on metal and non-metal surfaces has been widely used in many fields such as decorations, tableware, medical equipment and electronic products. Silver plating first began in 1800 and was proposed by the Elkington brothers in Birmingham, England. The electroplating solution used It is an alkaline cyanide system. Because cyanide has a very high complexation coefficient, the electroplating solution of the cyanide silver plating system is extremely stable, and the obtained coating is uniform and compact. The electroplating process is simple and the cost is low. However, as people With the continuous improvement of environmental awareness, people urgently need to develop a mature cyanide-free silver plating process to replace the heavily polluting cyanide silver plating. This is also the mainstream direction of future development. At present, cyanide-free silver plating mainly faces the following problems: ( 1) The performance of the coating cannot meet the process requirements, especially the engineering silver plating, which has more requirements than the decorative silver plating. For example, the crystallization of the coating is not as fine and smooth as cyanide, or the purity of the coating is not enough, and there are organic inclusions in the coating, resulting in hardness Too high, decreased electrical conductivity, etc.,

Method used

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  • Cyanide-free composite electroplating method for plating RE-TiO2-Ag layer on surface of steel substrate
  • Cyanide-free composite electroplating method for plating RE-TiO2-Ag layer on surface of steel substrate

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Embodiment 1

[0019] A kind of cyanide-free composite plating La-TiO on the surface of steel substrate 2 -A method for electroplating an Ag layer, comprising the steps of:

[0020] (1) Carry out pretreatment to steel substrate: carry out polishing successively, degreasing, acidification, activation step, wherein polishing is to adopt polishing machine to carry out polishing treatment to workpiece, and grinding belt speed is 0.5-1m / s, The abrasive is one or more mixtures of 200-280 mesh alumina, silicon carbide or zirconia. The degreasing agent is an alkaline degreasing agent composed of sodium carbonate, sodium phosphate, sodium silicate and emulsifier. The degreasing temperature 60°C, acidification is to use 20wt% mixed acid to remove residual lye and excess oxides on the surface, the mixed acid includes hydrofluoric acid and nitric acid, the volume ratio is 0.5:1, and the activation step is to use VHCl:VH 2 SO 4 = 1:2 mixed acid with a mass fraction of 5wt% for activation. The activatio...

Embodiment 2

[0025] A kind of cyanide-free composite plating Pr-TiO on the surface of steel substrate 2 -A method for electroplating an Ag layer, comprising the steps of:

[0026] (1) Carry out pretreatment to steel substrate: carry out polishing successively, degreasing, acidification, activation step, wherein polishing is to adopt polishing machine to carry out polishing treatment to workpiece, and grinding belt speed is 0.5-1m / s, The abrasive is one or more mixtures of 200-280 mesh alumina, silicon carbide or zirconia. The degreasing agent is an alkaline degreasing agent composed of sodium carbonate, sodium phosphate, sodium silicate and emulsifier. The degreasing temperature 63°C, acidification is to use 30wt% mixed acid to remove residual lye and excess oxides on the surface, the mixed acid includes hydrofluoric acid and nitric acid, the volume ratio is 0.5:1.3, and the activation step is to use VHCl:VH 2 SO 4 = 1:2 mixed acid with a mass fraction of 6.5wt% for activation. The activ...

Embodiment 3

[0031] A kind of cyanide-free composite plating Gd-TiO on the surface of steel substrate 2 -A method for electroplating an Ag layer, comprising the steps of:

[0032] (1) Carry out pretreatment to steel substrate: carry out polishing successively, degreasing, acidification, activation step, wherein polishing is to adopt polishing machine to carry out polishing treatment to workpiece, and grinding belt speed is 0.5-1m / s, The abrasive is one or more mixtures of 200-280 mesh alumina, silicon carbide or zirconia. The degreasing agent is an alkaline degreasing agent composed of sodium carbonate, sodium phosphate, sodium silicate and emulsifier. The degreasing temperature 65°C, acidification is to use 40wt% mixed acid to remove residual lye and excess oxides on the surface, the mixed acid includes hydrofluoric acid and nitric acid, the volume ratio is 0.5:1.5, and the activation step is to use VHCl:VH 2 SO 4 = 1:2 mixed acid with a mass fraction of 8wt% for activation. The activat...

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Abstract

The invention provides a cyanide-free composite electroplating method for plating a RE-TiO2-Ag layer on the surface of a steel substrate. RE rare earth element is selected from La<3+>, Pr<3+>, Gd<3+> or Yb<3+>, and titanium oxide is from titanium oxide powder with the size of 20-100nm or a titanium oxide sol solution. The electroplating method is safe and environment-friendly, the preparation process is simple, and an obtained electroplated layer is uniform, compact, strong in corrosion resistance and strong in oxidation resistance and has relatively good antibacterial and bactericidal properties.

Description

technical field [0001] The invention belongs to the technical field of electrochemical composite silver plating, and in particular relates to a novel cyanide-free silver plating solution and an electroplating process. Background technique [0002] Silver is a malleable and malleable metal with white light. It has excellent thermal conductivity and electrical conductivity. It is very stable in lye and some organic acids, and its price is relatively cheap compared with other precious metals. Therefore, silver plating on metal and non-metal surfaces has been widely used in many fields such as decorations, tableware, medical equipment and electronic products. Silver plating first began in 1800 and was proposed by the Elkington brothers in Birmingham, England. The electroplating solution used It is an alkaline cyanide system. Because cyanide has a very high complexation coefficient, the electroplating solution of the cyanide silver plating system is extremely stable, and the obta...

Claims

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Application Information

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IPC IPC(8): C25D3/56C25D15/00
CPCC25D3/56C25D15/00
Inventor 白林森梁莲芝
Owner 长江润发(江苏)薄板镀层有限公司
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