Steel piece cyanide-free copper plating method adopting applied magnetic field

A technology for cyanide-free copper and steel plating, applied in the field of cyanide-free copper plating, can solve the problems of affecting the performance of the coating, the coarse grains of the coating, and the low production efficiency, and achieve the effects of fast coating deposition, uniform grains, and easy realization.

Inactive Publication Date: 2016-07-20
NANJING CHENGUANG ART ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the traditional cyanide copper plating process, the cyanide-free copper plating process usually requires electroplating under heating conditions. If the temperature is too high, it will affect the stability of the plating solution, making the process difficult to control and increasing production and maintenance costs; plating deposition The speed is slow, the production efficiency is low, and the obtained coating is not fine and compact; especially when the thickness of the coating needs to be increased, the long plating time will cause the coating grain to be coarse and the pores to increase, thus affecting the performance of the coating

Method used

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  • Steel piece cyanide-free copper plating method adopting applied magnetic field

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The cyanide-free copper plating method of the iron and steel parts disclosed in this embodiment is carried out in the following steps:

[0015] Step 1: 1. Use 320 mesh and 600 mesh sandpaper to polish the steel statue to be plated successively to make the surface of the substrate smooth and flat, and remove the obvious burrs and oxide layer on the surface of the substrate; 2. Soak the polished statue to be plated in 70 Degreasing is carried out in a chemical degreasing solution at ~90°C for 20 minutes. The composition of this chemical degreasing solution is: sodium hydroxide 10-15g / L, sodium carbonate 20-30g / L, sodium silicate 50-70g / L, Sodium phosphate 10-15g / L; 3. At a temperature of 70°C-80°C and a current density of 2A / dm2-4A / dm2, use the electrolytic degreasing fluid to perform cathodic electrolytic degreasing on the statue of the steel parts to be plated for 1 minute. Then carry out anode electrolytic degreasing for 30 seconds. The composition of this electrolytic...

Embodiment 2

[0019] The difference between this embodiment and the first embodiment is that the electroplating time is 45 minutes. Others are the same as in Embodiment 1.

[0020] Observe the surface of the copper-plated statue with the naked eye and a magnifying glass. The surface is covered by the coating, and the coating has a small amount of impurities.

Embodiment 3

[0022] The difference between this embodiment and Embodiment 1 is that the magnetic field applied outside the electroplating bath is a pulsed magnetic field, the magnetic induction of the pulsed magnetic field is 80-120 gauss, and the direction of the pulsed magnetic field is the same as that of the copper ions in the electroplating solution. The direction of movement is vertical, with a positive pulse of 20 to 30 seconds and a negative pulse of 5 to 15 seconds as a cycle, and the cycle is carried out until the total plating time is 5 to 15 minutes. Others are the same as in Embodiment 1.

[0023] Observe the surface of the copper-plated statue with the naked eye and a magnifying glass. The coating is bright and uniform without impurities and bubbles.

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Abstract

The invention discloses a steel piece cyanide-free copper plating method which comprises the following steps: step 1, carrying out treatment including polishing, oil removing, cleaning, activating and the like on a plated steel piece; step 2, putting the plated steel piece and a pure copper plate into an electroplating liquid by taking the pretreated plated steel piece as a cathode and the pure copper plate as an anode, applying voltage at two sides of the cathode and the anode, applying a pulse magnetic field to an electroplating bath, and carrying out electroplating by ensuring that the direction of the magnetic field is vertical to the movement direction of copper ions in the electroplating liquid; and step 3, carrying out treatment including cleaning, passivation, drying and the like on the electroplated steel piece. By adopting the method disclosed by the invention to plate copper for a steel statue, the deposition rate of a clad layer is high, the surface is bright and smooth, and the technology is easy to control.

Description

technical field [0001] The invention relates to a cyanide-free copper plating method, in particular to a cyanide-free electro-copper plating method for iron and steel statues. Background technique [0002] Copper statues are very popular because of their simple and beautiful appearance, and the copper alloy has good corrosion resistance and is not easy to oxidize in a dry environment. However, due to limited copper resources and high prices, other metals or alloys with abundant resources and low prices, such as iron and stainless steel, are usually used to make statues, and then copper-plated on them to imitate copper statues. The cyanide copper plating process is widely used when electroplating on the surface of active metals or alloys, such as iron and zinc. The cyanide copper plating process is easy to operate, and the obtained coating is meticulous and has good bonding force. However, cyanide is a highly toxic chemical. The use of cyanide copper plating process is very ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D5/18C25D5/00C25D5/36C25D3/38
CPCC25D5/006C25D3/38C25D5/18C25D5/36
Inventor 吴清翠王凤
Owner NANJING CHENGUANG ART ENG CO LTD
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