Nickel silver platinum rhodium multilayer composite plating process

A multi-layer composite and electroplating technology, which is applied in the field of electroplating technology, can solve the problems of easy discoloration on the surface of silver-plated workpieces, and easy discoloration on the surface of workpieces, etc., and achieve the effect of bright appearance, stable composite coating and good wear resistance

Inactive Publication Date: 2005-06-01
刘广斯
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention takes the easy discoloration of the surface of the silver-plated workpiece as the cause, intends to solve the problem of the easy discoloration of the surface of the workpiece by multi-layer electroplating; and aims at the problems existing in the existing electroplating process, especially the multi-layer electroplating process, and provides a nickel-silver platinum-rhodium Multilayer Composite Plating Process

Method used

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Effect test

Embodiment 1

[0011] Nickel-silver-platinum-rhodium multilayer composite electroplating process includes pre-silver plating process, nickel plating process, silver plating process and platinum-rhodium plating process; the nickel plating process includes the following technical parameters: electroplating solution formula: dissolve 350 in 1 liter of distilled water grams of nickel sulfate, 75 grams of nickel chloride, 55 grams of boric acid, 40 ml of 22 nickel displacer, 1.5 ml of 311 nickel brightener, 2.0 ml of NAW-4 nickel wetting agent, 2.5 ml of W nickel wetting The plating solution temperature is 60°C, the pH value of the plating solution is 4.0, the cathode current density is 2 amperes / dm2, the anode current density is 2 amperes / dm2, and the nickel plating time is 7 minutes; the silver plating process includes the following technical parameters: electroplating solution Recipe: Dissolve 50 grams of silver cyanide, 190 grams of potassium cyanide, 20 grams of potassium carbonate, 15 grams ...

Embodiment 2

[0017] Nickel-silver-platinum-rhodium multi-layer composite electroplating process includes pre-silver plating process, nickel plating process, silver plating process and platinum-rhodium plating process; the nickel plating process includes the following technical parameters: electroplating solution formula: dissolve 280 in 1 liter of distilled water gram (or 330 grams) of nickel sulfate, 62 grams (or 78 grams) of nickel chloride, 52 grams (or 58 grams) of boric acid, 35 milliliters (or 45 milliliters) of 22 nickel displacer, 2 milliliters of 311 Nickel brightener, 0.8 milliliters (or 1.5 milliliters) of NAW-4 nickel wetting agent, 1.5 milliliters (or 3.5 milliliters) of W nickel wetting agent; the temperature of the plating solution is 58 ° C, the pH value of the plating solution is 4.5, and the cathode current density is 3 amperes / square decimeter, anode current density 1 ampere / square decimeter, nickel plating time 8 minutes; silver cyanide or 65 grams of potassium silver ...

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Abstract

The composite multilayer Ni, Ag, Pt and Rh electroplating process includes successive Ag pre-electroplating step, Ni-electroplating step, Ag-electroplating step and Pt and Rh electroplating step, with special requirement in electrolyte composition and pH value, electroplating temperature and time, electrode current density and other technological parameters. The said electroplating process has no problem of color change in Ag plated surface, and the coating is bright, smooth, beautiful, fast and without color change.

Description

technical field [0001] The invention relates to an electroplating process, in particular to a nickel-silver-platinum-rhodium multilayer composite electroplating process. Background technique [0002] Most of the existing electroplating processes are single metal plating, such as silver plating, copper plating, zinc plating, etc. After silver plating, the surface of the workpiece is easy to turn black and purple (generally less than 30 days). In order to solve the surface discoloration of silver-plated workpieces, there is a special anti-silver discoloration agent in the prior art, which can delay the discoloration of the surface of silver-plated workpieces (generally, it can be maintained for 60-90 days), but it still cannot fundamentally solve the problem of discoloration of the surface of silver-plated workpieces. . [0003] There is a two-layer electroplating process in the prior art, such as plating a layer of nickel on the silver-plated outer layer of the workpiece, w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D5/12
Inventor 刘广斯
Owner 刘广斯
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