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Coating technique for decoration chromium

A process and process technology, which is applied in the field of decorative chromium plating process, can solve the problems of network micro-cracks and uneven distribution of micro-pore density, poor chrome plating coverage, and reduced potential difference, and achieve uniform distribution of non-conductive solid particles , Improve corrosion resistance, uniform thickness effect

Inactive Publication Date: 2007-10-17
QUANZHOU NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the bringing in and out of the solution, three-nickel-chromium is easy to form cross-contamination, the potential difference is reduced, and the effect of high-sulfur nickel is lost, so it is rarely used at present; micro-cracked chromium is formed on the electroplated high-stress nickel layer, and the nickel seal Microporous chromium is formed on the electroplated composite nickel layer. On the parts with complex shapes, due to the uneven distribution of current density, there are defects such as network microcracks and uneven distribution of micropore density; chromium plating on high-stress nickel is also There is a problem of poor coverage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Decorative chromium plating process of the present invention comprises the following steps successively:

[0017] 1. Degreasing: Use the solution composed of the following components to remove oil stains on the substrate of the plated parts: NaOH: 70g / L, Na2CO3·10H2O: 30g / L, Na3PO4·12H2O: 35g / L, Na2SiO3: 5g / L, OP emulsifier: 2ml / L, at a temperature of 80-90°C for 5-20 minutes;

[0018] 2. Pickling: pickling the substrate of the plated parts degreased in step 1 by hydrochloric acid (37%) 500ml / L at room temperature for 0.5 to 10 minutes;

[0019] 3. Activation: activate the plated part substrate through step 2 pickling by utilizing sulfuric acid (98%) 60ml / L at room temperature, and the time is 0.5~2 minutes;

[0020] 4. Neutralization: Use Na2CO3·10H2O: 40g / L to neutralize the plated substrate activated in step 3 at room temperature for 0.5 minutes;

[0021] 5. Copper electroplating: Electroplate copper on the plated substrate neutralized in step 4 with an electrolyte...

Embodiment 2

[0026] The difference between the present embodiment and embodiment 1 is only that the electroplating semi-bright nickel process is carried out between step five and step six of embodiment 1, and the electroplating semi-bright nickel process utilizes an electrolyte composed of the following components to electroplate semi-bright nickel: NiSO4 7H2O: 260g / L, NiCl 6H2O: 50g / L, H3BO3: 35g / L, sodium lauryl sulfate: 0.015g / L, 1,4 butynediol 0.25g / L, acetic acid 2g / L , where the temperature is 45-50°C, the cathode current density Dk is 3.0A / dm2, and the pH of the electrolyte is 4.0-4.5;

Embodiment 3

[0028] Decorative chromium plating process of the present invention comprises the following steps successively:

[0029] 1. Degreasing: Use the solution composed of the following components to remove oil stains on the substrate of the plated parts: NaOH: 10g / L, Na2CO3·10H2O: 20g / L, Na3PO4·12H2O: 50g / L, Na2SiO3: 5g / L, OP emulsifier: 3ml / L, the treatment time is 5-20 minutes at a temperature of 80-90°C;

[0030] Two, activation: utilize sulfuric acid (98%) 50ml / L to carry out activation at room temperature through the degreased plated substrate of step 1, and the time is 0.5 minute;

[0031] 3. Electroplating bright nickel: electroplate bright nickel on the plated substrate activated in step 2 using the electrolyte composed of the following components: NiSO4 7H2O: 290g / L, NiCl 6H2O: 60g / L, H3BO3: 50g / L, Brightener DK-N63A: 0.8ml / L, brightener DK-N20B: 10ml / L, wetting agent WA-230: 1.0ml / L, where the temperature is 55-60°C, and the cathode current density Dk is 5A / dm2, The pH o...

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Abstract

The present invention discloses a decorative chromium plating process capable of improving corrosion resisting property of decorative chromium composite plating. Said method comprises mainly the following steps: oil removing, activation, nickel electric plating, chemically composite plating, chromium electric plating, plating the electric plating nickel layer with a chemical composite deposite containing non-conductive solid particles, and then electric-plating the chemical composite deposite containing non-conductive solid particles with chromium to form micropore chromium. The present invention possesses the beneficial effects as follows: regardless whether or not the part external shape is complicated, chrome plating micropores are equispaced and exhibits a special performance of uniform corrosion current dissipation, the thickness of the electric plating nickel layer is reduced, and then corrosion resistant level of decorative chromium compages plating is improved remarkably.

Description

technical field [0001] The invention relates to a plating process, in particular to a decorative chrome plating process. Background technique [0002] In order to improve the corrosion resistance of decorative chromium, high-end products generally use three-nickel-chromium, micro-cracked chromium and electroplated nickel-sealed microporous chromium and other processes. However, due to the bringing in and out of the solution, three-nickel-chromium is easy to form cross-contamination, the potential difference is reduced, and the effect of high-sulfur nickel is lost, so it is rarely used at present; micro-cracked chromium is formed on the electroplated high-stress nickel layer, and the nickel seal Microporous chromium is formed on the electroplated composite nickel layer. On the parts with complex shapes, due to the uneven distribution of current density, there are defects such as network microcracks and uneven distribution of micropore density; chromium plating on high-stress ...

Claims

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Application Information

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IPC IPC(8): C23C28/02C25D5/34C23G5/00C23G1/02C25D3/38C25D3/12C23C18/34C25D3/04C25D5/12
Inventor 尹国光
Owner QUANZHOU NORMAL UNIV
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