Anti-corrosion and anti-discoloration process for copper alloy ornament
A copper alloy and anti-discoloration technology, which is applied to devices and coatings that apply liquid to the surface, can solve the problems of corrosion and discoloration of packaging boxes, damage to the color of packaging boxes, etc., and achieve the effect of inhibiting corrosion and discoloration.
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Embodiment 1
[0031] (a) Degreasing
[0032] Soak the copper alloy jewelry in the degreasing solution for 15 minutes at a temperature of 80°C. The degreasing agent includes the following raw materials:
[0033] Sodium hydroxide 20g / L, trisodium phosphate 30g / L, sodium carbonate 40g / L, sodium silicate 2g / L;
[0034] (b) Hot water rinse
[0035] Put the copper alloy jewelry after degreasing treatment into hot water at 80°C for 1 min;
[0036] (c) Electrochemical polishing
[0037] Put the copper alloy rinsed with hot water into the electrochemical polishing solution for electrochemical polishing. The cathode material is lead during electrochemical polishing. The temperature of the electrochemical polishing solution is 20°C and the polishing time is 1min. To fully stir the electrochemical polishing solution, the electrochemical polishing solution includes the following raw materials according to mass percentage:
[0038] 75% phosphoric acid, 15% sulfuric acid, 6% chromic anhydride, 4% wate...
Embodiment 2
[0046] (a): Put the electrochemically polished copper alloy packaging box at 64°C, 4.5mol / L CrO 3 After soaking in the aqueous solution for 3.5 minutes, rinse and dry;
[0047] (b): Immerse the dried packaging box in 0.1 mol / L benzotriazole aqueous solution for 3.8 minutes, wash it with water, and then dry it in the air.
[0048] (c): Put the dried copper alloy packaging box at 66°C, 5.8mol / L CrO 3 After soaking in the aqueous solution for 5.8min, then rinse and dry;
[0049] (d): Immerse the dried packaging box in 0.1mol / L benzotriazole aqueous solution for 3.8min, wash it with water and then dry it in the air;
[0050] (e): the dried copper alloy package box in 4.8mol / L of H 2 SO 4 Soak in the medium for a moment, then rinse it, and then soak it in 1.9% K2Cr2O7 for 2.8min;
[0051] (f): Coat the surface of the impregnated copper alloy packaging box with nitro-lacquer or metallic paint, bake at 70°C for 20 minutes, and cool indoors;
Embodiment 3
[0053] (a): Put the electrochemically polished copper alloy packaging box at 65°C, 5mol / L CrO 3 After soaking in the aqueous solution for 5 minutes, rinse and dry;
[0054] (b): Immerse the dried packaging box in 0.1 mol / L benzotriazole aqueous solution for 4 minutes, wash it with water, and then dry it in the air.
[0055] (c): Put the dried copper alloy packaging box at 68°C, 6mol / L CrO 3 After soaking in the aqueous solution for 6 minutes, then rinse and dry;
[0056] (d): Immerse the dried packaging box in 0.1mol / L benzotriazole aqueous solution for 4 minutes, wash it with water and then dry it in the air;
[0057] (e): Put the dried copper alloy package in 5mol / L of H 2 SO 4 Soak in the medium for an instant, then rinse it, and then soak it in 2% K2Cr2O7 for 3min;
[0058] (f): Coat the surface of the impregnated copper alloy packaging box with nitro-lacquer or metallic paint, bake at 80°C for 30 minutes, and cool indoors;
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