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Method for coloring copper and copper alloy with gun color

A technology of alloy and gun color, which is applied in the coating process of metal materials, etc., can solve the problems of imperfect chemical oxidation process, etc., and achieve the effect of strong color fastness, uniform tooth color and stable properties

Inactive Publication Date: 2015-05-27
严振
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, traditional electroplating has a mature process that can deposit gun-colored tin-nickel-cobalt alloys, but the chemical oxidation process for gun-colored copper and its alloys is not perfect, which has brought many problems to the industry.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0023] Pretreatment of brass zippers, chemical polishing, weak alkali neutralization, gun coloring according to copper sulfate pentahydrate CuSO 4 ·5H 2 O: 50g / L, concentrated sulfuric acid H 2 SO 4 : 25mL / L, selenium dioxide SeO 2 : 6g / L, ammonium persulfate (NH 4 ) 2 S 2 o 8 : 60g / L, Inorganic blackening agent: 50mg / L, Polyethylene glycol (P-6000): 20mg / L The coloring time is 3 minutes, the coloring temperature is room temperature, and after taking it out, use 5% NaCO 3 The solution neutralizes the pre-fixed color, shakes dry, passivates, and bakes with oil.

Embodiment example 2

[0025] Pretreatment of brass zippers, chemical polishing, weak alkali neutralization, gun coloring according to copper sulfate pentahydrate CuSO 4 ·5H 2 O: 30g / L, concentrated sulfuric acid H 2 SO 4 : 20mL / L, selenium dioxide SeO 2 : 4g / L, ammonium persulfate (NH 4 ) 2 S 2 o 8 : 60g / L, Inorganic blackening agent: 50mg / L, Polyethylene glycol (P-6000): 20mg / L The coloring time is 5 minutes, the coloring temperature is room temperature, and after taking it out, use 5% NaCO 3 Solution neutralization and pre-fixation, drying, passivation, oiling and baking.

Embodiment example 3

[0027] Pretreatment of brass zippers, chemical polishing, weak alkali neutralization, gun coloring according to copper sulfate pentahydrate CuSO 4 ·5H 2 O: 60g / L, concentrated sulfuric acid H 2 SO 4 : 40mL / L, selenium dioxide SeO 2 : 8g / L, ammonium persulfate (NH 4 ) 2 S 2 o 8 : 80g / L, Inorganic blackening agent: 50mg / L, Polyethylene glycol (P-6000): 20mg / L The coloring time is 2 minutes, the coloring temperature is room temperature, and after taking it out, use 5% NaCO 3 Solution neutralization and pre-fixation, drying, passivation, oiling and baking.

[0028] After implementing the brass zipper surface coloring process in the above three implementation cases, the zipper tooth color is uniform, the color fastness is strong, and the corrosion resistance is good. It can pass a series of zipper standard tests such as friction, salt spray, and enzyme washing.

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PUM

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Abstract

The invention relates to a method for coloring copper and copper alloy with a gun color. The method comprises the following steps: (1) pretreatment: performing alkali chemical oil removal on copper and alloy pieces to be colored, removing oil stains from the surfaces of the plated pieces, neutralizing, cleaning and drying; (2) chemical polishing: performing two steps of chemical polishing, namely soaking into a polishing solution for polishing for 1-5 minutes and then performing film removal polishing; (3) weak base neutralization: neutralizing residual acid in the polished plated pieces, or micro-etching zinc and exposed copper on the surface of metal with weak base; (4) coloring with the gun color: putting the plated pieces into 20-120g / L of copper sulfate pentahydrate CuSO4.5H2O, 3-50mL / L of concentrated sulfuric acid H2SO4, 1.0-12g / L of selenium dioxide SeO2, 10-80g / L of ammonium persulfate (NH4)2S2O8, 10-100mg / L of inorganic blackening agent and 0.5-80mg / L of polyethylene glycol (P-6000), coloring for 0.5-8 minutes at normal temperature, taking out, neutralizing acid with 5% NaCO3 solution, previously fixing color, washing and drying; (5) passivation: soaking into 2% benzotriazole BTA solution for passivation, washing and drying; and (6) fat liquoring and baking: liquoring fat and baking for 1-5 minutes at 110 DEG C.

Description

technical field [0001] The invention relates to the field of metal surface treatment, in particular to a chemical coloring method for gun-coloring of copper and its alloys, and is especially suitable for the gun-color chemical coloring method of brass zippers and related accessories. Background technique [0002] Gun color is a glossy black with a cold gleam, known for its resemblance to the finish of a steel gun. The gunmetal tone is stable and high-end, and it is a popular color matching for clothing accessories. Gunmetal zippers are often matched with high-end leather clothes and leather goods. The market demand for gunmetal zippers is strong. At present, traditional electroplating has a mature process that can deposit gun-colored tin-nickel-cobalt alloys, but the chemical oxidation process for gun-colored copper and its alloys is not yet perfect, which has brought many problems to the industry. Contents of the invention [0003] In response to market demand, the prese...

Claims

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Application Information

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IPC IPC(8): C23C22/52C23C22/02
Inventor 严振
Owner 严振
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