6061 Aluminum Rod Chemical Immersion Imitation Gold Process
ã€China Aluminum Industry Network】 Gold is loved by people for its luxurious, dignified and elegant decorative effect. With gold decoration, the cost is too high and ordinary people are discouraged. 6061 aluminum rod imitation gold plating obtained by electroplating method, color up to 18K ~ 22K gold, and the cost is greatly reduced, to meet the needs of ordinary people on the golden decoration. At present, the imitation gold plating is mainly realized by electroplating method, and its application process is cyanide-plating imitation gold or pyrophosphate plating imitation gold [1-2].
Among them, cyanide plating gold-plating imitation technology is more mature, imitating gold-tone stability, process maintenance, and is favored by enterprises. However, cyanide is highly toxic and has serious environmental pollution. Therefore, people turned to the development of non-cyanide pyrophosphate plating gold imitation process. Although its plating solution is low in toxicity and has little pollution to the environment, its stability is not good and it is difficult to control the imitating gold color. In addition, these two kinds of imitation gold electroplating process is long, all need to electroplating bright copper and bright nickel, equipment investment, higher production costs. Therefore, the development of a simple chemical imidization gold imitation process is imminent. The research group has used the method of direct electroless nickel plating and gold-plated chemical imitation plating to successfully develop a gold-plated chemical imitation gold-plating imitation gold process technology [3]. In order to further expand the scope of application of the gold-plated chemical imitation gold plating process, the research group has also adopted a combination of secondary zinc immersion + alkaline electroless nickel plating + acidic electroless nickel plating + chemical leaching imitation gold to successfully develop a new one. 6061 aluminum rod chemical imitation gold imitation gold technology, the formation of the imitation gold layer color is elegant and pure, can be comparable with the electroplated imitation gold layer, and the bonding force is good, the process is simple, and the environment is small, so it has a broad application prospects. In order to compare the corrosion resistance of the immersion plating layer in salt water, electroplating imitation gold flakes and the chemical imitation plating gold-imitation flakes of this process were simultaneously immersed in room temperature and 5% (mass fraction) NaCl solution. After a certain period of time, the surface of the test specimen was observed. In the case of corrosion, no corrosion was observed in the test for 240 hours as a pass.
2.3 Process Flow Because of the active nature of aluminum chemistry, it has a strong affinity for oxygen. Therefore, whether the 6061 aluminum rod chemical imitation gold plating is successful or not, and the process combination is the key. Through the study and comparison, four kinds of combined technological processes were selected for research.
(1) Secondary Zinc Leaching + Alkaline Electroless Nickel Plating + Acidic Electroless Nickel Plating + Chemical Immersion Gold Imitation Gold Process: Alkaline Degreasing - Hot Water Washing - Flow Washing - Alkali Erosion - Flow Washing - Nitric Acid Light - Water Washing - Once Zinc leaching ─ Washing with water ─ 1:1 (volume ratio, the same below) Nitric acid dezincification ─ Washing with water ─ Secondary zinc leaching [4] ─ Washing with water ─ Deionized water washing ─ Alkaline electroless nickel plating [5] ─ Washing water ─ Acidic electroless nickel plating [6] - Flow washing - Imitation gold plating - Washing water - Passivation - Washing - Drying - Dipping varnish - Drying - Inspection.
(2) Secondary Zinc Leaching + Flash Nickel Plating + Acidic Electroless Nickel Plating + Chemical Immersion Gold Imitation Gold Process: Alkaline Degreasing - Hot Water Washing - Washing with Water - Alkali Erosion - Flow Washing - Nitric Acid Light - Water Washing - Zinc Dipping ( Zinc Oxide 100g/L, Sodium Hydroxide 500g/L, Potassium Sodium Tartrate 20g/L, Ferric chloride 1g/L, Temperature 15~25°C, Time 30~60s) - Washed with water ─ 1:1 Nitric Acid Dezincification - Washing with water - Secondary zinc leaching - Washing with water - Pre-plating with neutral nickel - Flow washing - Deionized water washing - Electroless nickel plating - Hot water washing - Hot water sealing (5 min) - Drying - Performance test.
(3) Pre-plated Nickel + Acidic Electroless Nickel+6061 Aluminum Bar Electroless Imitation Gold Imitation Process: Alkaline Degreasing - Hot Washing - Flow Washing - Alkali Erosion - Flow Washing - Nitric Acid Light - Flow Washing - Pre-plated Neutral Nickel - Electroless Nickel Plating - Hot Washing - Hot Water Sealing (5 min) - Drying - Performance Testing.
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