Method for preventing copper from discolouring

An anti-discoloration and anti-copper technology, applied in the field of metal anti-oxidation, can solve the problems of short anti-oxidation time and high cost of copper powder antioxidants, and achieve the effects of good protection, low odor and convenient storage

Inactive Publication Date: 2014-09-17
WUZHOU HENGSHENG ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cost of preparing copper powder antioxidants in the prior art is high, and the antioxidation time of the prepared copper powder antioxidants is short

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A kind of copper anti-tarnishing method provided by the invention, this method comprises the following steps successively:

[0024] 1) uniformly mix 1 part by weight of copper anti-discoloration agent and 10 parts by weight of water to obtain a mixed anti-discoloration liquid with a pH value of 5;

[0025] 2) Soak the copper parts that need anti-tarnish in the mixed anti-tarnish solution in step 1) for 10 minutes;

[0026] 3) Rinse the copper parts soaked in step 2) with clear water;

[0027] 4) Rinse with 100°C water and dry for the next step.

[0028] The copper anti-tarnish agent used is formulated as follows per liter: hydroxyethylidene diphosphonic acid 50g, ethanol 100g, hydrogen peroxide 80g, benzotriazole 40g, isothiocyanate 10g, lauryl sulfate 15g, molybdenum Sodium phosphate 10g, sodium tripolyphosphate 12g.

Embodiment 2

[0030] Another method for preventing discoloration of copper provided by the invention, the method comprises the following steps in sequence:

[0031] 1) 1 weight part of copper anti-discoloration agent and 6 weight parts of water are uniformly mixed to obtain a mixed anti-discoloration liquid with a pH value of 6.5;

[0032] 2) Soak the copper parts that need anti-tarnish in the mixed anti-tarnish solution in step 1) for 5 minutes;

[0033] 3) Rinse the copper parts soaked in step 2) with clear water;

[0034] 4) Rinse with 100°C water and dry for the next step.

[0035] The copper anti-tarnish agent formula used is as follows: hydroxyethylidene diphosphonic acid 50g, ethanol 100g, hydrogen peroxide 50g, benzotriazole 20g, isothiocyanate 20g, lauryl sulfate 8g, sodium molybdate 20g, sodium tripolyphosphate 8g.

Embodiment 3

[0037] Another method for preventing discoloration of copper provided by the invention, the method comprises the following steps in sequence:

[0038] 1) uniformly mix 1 weight part of copper anti-discoloration agent and 7 weight parts of water to obtain a mixed anti-discoloration liquid with a pH value of 9;

[0039] 2) Soak the copper parts that need anti-tarnish in the mixed anti-tarnish solution in step 1) for 10 minutes;

[0040] 3) Rinse the copper parts soaked in step 2) with clear water;

[0041] 4) Rinse with 100°C water and dry for the next step.

[0042] The copper anti-tarnish agent formula used is as follows: hydroxyethylidene diphosphonic acid 70g, ethanol 70g, hydrogen peroxide 100g, benzotriazole 30g, isothiocyanate 15g, lauryl sulfate 10g, sodium molybdate 15g, sodium tripolyphosphate 10g.

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PUM

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Abstract

The invention belongs to the technical field of metal antioxidation and discloses a method for preventing copper from discolouring and aims at providing a method for preventing copper from discolouring with good anti-corrosion property, no corrosion in long time and no fading in colour. The method for preventing copper from discolouring sequentially comprises the following steps: 1) uniformly mixing 1 part by weight of copper discolouration preventing agent with 6-10 parts by weight of water, so that a mixed discolouration preventing solution is obtained; 2) soaking a copper part requiring discolouration prevention into the mixed discolouration preventing solution obtained in the step 1) for 5-10 minutes; 3) cleaning the copper part soaked in the step 2) with clear water; 4) washing with hot water, drying, and carrying out operation of the next step, wherein each litre of the copper discoloration preventing agent in the step 1) is composed of the following components: 50-100g of hydroxyl ethidene diphosphonate, 50-100g of ethyl alcohol, 80-150g of hydrogen peroxide, 20-40g of corrosion inhibitor, 10-20g of isothiocyanate, 8-15g of alkyl sulfate, 10-20g of sodium molybdate, 8-12g of sodium tripolyphosphate and balance of water.

Description

technical field [0001] The invention relates to a metal anti-discoloration agent method, in particular to a copper anti-discoloration method, which belongs to the technical field of metal anti-oxidation. Background technique [0002] Copper metal has good luster, and its electrical conductivity is almost equal to that of silver, but the price is only one-twentieth of silver. Therefore, in terms of cost performance, copper powder is an ideal conductive filler. These characteristics of copper powder make it widely used in conductive adhesives, conductive plastics, conductive coatings and other fields. However, the fine copper powder has a large specific surface area, active chemical properties, and is prone to oxidation in the air, resulting in darkening of the material and poor decoration, and the oxide is an insulator, which makes it difficult for conductive materials to be used for a long time. Maintain good electrical conductivity. Therefore, how to prevent copper powder...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F11/14
Inventor 宋云
Owner WUZHOU HENGSHENG ELECTRONICS
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