CN104250751A - Copper alloy surface passivation technology - Google Patents

Abstract

The invention discloses a copper alloy surface passivation technology. A passivation solution used in the technology comprises 14-16g/L of citric acid, 6-8g/L of phytic acid, 5-8g/L of calcium biphosphate, 1.5-2.5g/L of amino trimethylene phosphonic acid, 3.0-5.0g/L of ammonium acrylate, 2.0-4.0g/L of 1,2,4-1H-triazole, 18-20ml/L of polyethylene glycol 4000, 20-24ml/L of hydrogen peroxide, 0.3-0.5g/L of cerium chloride, 0.3-0.5g/L of lanthanum chloride, and the balance of water. The passivation technology comprises the following steps: 1, carrying out ultrasonic alkali washing to remove oil; 2, carrying out pickling polishing, and rinsing with clear water; and 3, putting the passivation solution into a passivation tank, diluting according to a proportion of 1:2-3, adjusting the pH value of the obtained solution to 3.5-4.5, adjusting the temperature to 35-45DEG C, putting a workpiece in the tank, passivating for 8-12min, and drying.

Description

A kind of copper alloy surface passivation technology

Technical field

The present invention relates to technical field of surface, particularly relate to a kind of copper alloy surface passivation technology.

Background technology

China's Copper and its alloy amount of finish is annual about 1,000 ten thousand tons, and its every annual value of production is greater than 6,000 hundred million yuan.Generally, after machined copper and copper alloy workpiece, need to carry out Passivation Treatment to it, to improve its resistance to variable color and corrosion resistance.At present, the passivation of Copper and its alloy goods mainly adopts the treatment solutions such as chromic acid or its mixture to clean, but containing hexavalent chromium in the waste water after using these treatment solutions to carry out Cleaning and Passivation process, serious environment pollution and affect the healthy of operator.Therefore, how eliminating the hexavalent chromium in waste water after passivation, is the key issue that Copper and its alloy process for treating surface needs to solve.

At present, also have report to the method for environment-friendly type Copper and its alloy surface passivation, such as application number is that the patent of invention of CN86103910.6 adopts benzotriazole and polyvinyl alcohol to be passivator, but this patent still employs a small amount of chromic acid; Application number is that the patent of invention of CN200810187682.6 adopts benzotriazole 5-8g/l, 1-phenyl-5 mercapto tetrazole 2-4g/l, tartrate (or citric acid) 14-18g/l, Sodium orthomolybdate (or sodium wolframate) 2-4g/l, the mixed solution of sodium lauryl sulphate 0.5-1g/l carries out passivation to brass, but this passivating solution complicated component, and employ expensive Sodium orthomolybdate or sodium wolframate; Application number is that the patent of invention of CN201010217372.1 adopts phytic acid to be passivator, but needs to carry out under certain impressed voltage; Application number is that the patent of invention of CN201010595972.1 adopts the mixed solutions such as phytic acid, hydrogen peroxide, boric acid, polyoxyethylene glycol to carry out passivation to brass, but the method is very complicated with sample ingredient, and in phytic acid (phytinic acid), phosphorus content is very high, and the chemical oxygen demand (COD) in waste water can be caused to increase.

Summary of the invention

The object of the invention is to propose a kind of copper alloy surface passivation technology, the passivating solution that this technique adopts is not containing contaminate environment and the material affecting HUMAN HEALTH, and passivation effect is excellent.

For reaching this object, the present invention by the following technical solutions:

A kind of copper alloy surface passivation technology, consisting of of the passivating solution that this technique adopts: citric acid 14-16g/L, phytic acid 6-8g/L, monocalcium phosphate 5-8g/L, Amino Trimethylene Phosphonic Acid 1.5-2.5g/L, ammonium acrylate 3.0-5.0g/L, triazole 2.0-4.0g/L, Macrogol 4000 18-20ml/L, hydrogen peroxide 20-24ml/L, Cerium II Chloride 0.3-0.5g/L, Lanthanum trichloride 0.3-0.5g/L, surplus is water; Described passivation technology:

1) copper alloy workpiece is put into the rinse bath containing alkaline wash, adopt ultrasonic wave to carry out cleaning oil removing to it, scavenging period is 6-10 minute, then carries out clear water flushing;

2) pickling polishing, then rinses with clear water;

3) passivating solution with above-mentioned composition is put into deactivation slot, according to the dilution proportion of 1:2-3, make its pH value be 3.5-4.5, temperature is 35-45 DEG C, then puts into wherein by workpiece, and passivation time is 8-12 minute; Then dry.

The present invention has following beneficial effect:

(1) passivating solution that this technique adopts does not contain contaminate environment and affects the material of HUMAN HEALTH, and passivation effect is excellent, and in malaria, brass can keep 8-12 month nondiscoloration, and red copper can keep nondiscoloration in more than 6 months.Humidity be 80%, under temperature is the condition of 70 DEG C-90 DEG C: brass color and luster can keep more than 150 hours, and red copper color and luster can keep more than 80 hours.

(2) this passivating solution is easy to use, does not need cleaning, water saving after passivation; Applied widely, Passivation Treatment can not only be carried out to copper alloy, and also have good passivation to red copper (fine copper).

Embodiment

Embodiment one

A kind of copper alloy surface passivation technology, consisting of of the passivating solution that this technique adopts: citric acid 14g/L, phytic acid 8g/L, monocalcium phosphate 5g/L, Amino Trimethylene Phosphonic Acid 2.5g/L, ammonium acrylate 3.0g/L, triazole 4.0g/L, Macrogol 4000 18ml/L, hydrogen peroxide 24ml/L, Cerium II Chloride 0.3g/L, Lanthanum trichloride 0.5g/L, surplus is water; Described passivation technology:

1) copper alloy workpiece is put into the rinse bath containing alkaline wash, adopt ultrasonic wave to carry out cleaning oil removing to it, scavenging period is 6 minutes, then carries out clear water flushing;

2) pickling polishing, then rinses with clear water;

3) passivating solution with above-mentioned composition is put into deactivation slot, according to the dilution proportion of 1:2, make its pH value be 4.5, temperature is 35 DEG C, then puts into wherein by workpiece, and passivation time is 12 minutes; Then dry.

Embodiment two

A kind of copper alloy surface passivation technology, consisting of of the passivating solution that this technique adopts: citric acid 16g/L, phytic acid 6g/L, monocalcium phosphate 8g/L, Amino Trimethylene Phosphonic Acid 1.5g/L, ammonium acrylate 5.0g/L, triazole 2.0g/L, Macrogol 4000 20ml/L, hydrogen peroxide 20ml/L, Cerium II Chloride 0.5g/L, Lanthanum trichloride 0.3g/L, surplus is water; Described passivation technology:

1) copper alloy workpiece is put into the rinse bath containing alkaline wash, adopt ultrasonic wave to carry out cleaning oil removing to it, scavenging period is 10 minutes, then carries out clear water flushing;

2) pickling polishing, then rinses with clear water;

3) passivating solution with above-mentioned composition is put into deactivation slot, according to the dilution proportion of 1:3, make its pH value be 3.5, temperature is 45 DEG C, then puts into wherein by workpiece, and passivation time is 8 minutes; Then dry.

Embodiment three

A kind of copper alloy surface passivation technology, consisting of of the passivating solution that this technique adopts: citric acid 15g/L, phytic acid 7g/L, monocalcium phosphate 6.5g/L, Amino Trimethylene Phosphonic Acid 2.0g/L, ammonium acrylate 4.0g/L, triazole 3.0g/L, Macrogol 4000 19ml/L, hydrogen peroxide 22ml/L, Cerium II Chloride 0.4g/L, Lanthanum trichloride 0.4g/L, surplus is water; Described passivation technology:

1) copper alloy workpiece is put into the rinse bath containing alkaline wash, adopt ultrasonic wave to carry out cleaning oil removing to it, scavenging period is 8 minutes, then carries out clear water flushing;

2) pickling polishing, then rinses with clear water;

3) passivating solution with above-mentioned composition is put into deactivation slot, according to the dilution proportion of 1:2.5, make its pH value be 4.0, temperature is 40 DEG C, then puts into wherein by workpiece, and passivation time is 10 minutes; Then dry.

Claims (1)

1. a copper alloy surface passivation technology, is characterized in that, consisting of of the passivating solution that this technique adopts: citric acid 14-16g/L, phytic acid 6-8g/L, monocalcium phosphate 5-8g/L, Amino Trimethylene Phosphonic Acid 1.5-2.5g/L, ammonium acrylate 3.0-5.0g/L, triazole 2.0-4.0g/L, Macrogol 4000 18-20ml/L, hydrogen peroxide 20-24ml/L, Cerium II Chloride 0.3-0.5g/L, Lanthanum trichloride 0.3-0.5g/L, surplus is water; Described passivation technology:

1) copper alloy workpiece is put into the rinse bath containing alkaline wash, adopt ultrasonic wave to carry out cleaning oil removing to it, scavenging period is 6-10 minute, then carries out clear water flushing;

2) pickling polishing, then rinses with clear water;

3) passivating solution with above-mentioned composition is put into deactivation slot, according to the dilution proportion of 1:2-3, make its pH value be 3.5-4.5, temperature is 35-45 DEG C, then puts into wherein by workpiece, and passivation time is 8-12 minute; Then dry.