At China Aluminum Network, we follow a detailed and precise process for surface treatment of aluminum parts to ensure high-quality results. The procedure includes: degreasing using gasoline or trichloroethylene, followed by drying, cooling, and placing the parts on a fixture. Next, weak alkali corrosion is performed using a solution containing trisodium phosphate (Na3PO4) at 25–30 g/L, sodium carbonate (Na2CO3) at 25–30 g/L, and an additive at 2–4 g/L. An OP-10 emulsifier is also added at 0.5–1 ml/L. The temperature is maintained between 75–85°C, and the process lasts 40–60 seconds. Afterward, the parts are rinsed with warm water and then washed in running water. A nitric acid immersion follows, typically at room temperature for 30–60 seconds, before another clean water rinse and running water wash. The next step is zinc immersion, which involves a solution containing zinc oxide (ZnO) at 55–60 g/L, sodium hydroxide (NaOH) at 300–325 g/L, ferric chloride (FeCl3·6H2O) at 1.0–1.2 g/L, potassium sodium tartrate at 40–50 g/L, and sodium nitrate at 0.5–1 g/L. The temperature is kept between 30–37°C, and the immersion time is 40–60 seconds. After zinc dipping, electroplating is carried out at a current density of 0.8–1.2 A/dm² for 1–2 minutes. Finally, hard chrome plating is performed using a solution containing chromic acid (CrO3) at 250–260 g/L, sulfuric acid (H2SO4, d=1.84) at 2.5–2.6 g/L, and trivalent chromium (Cr2O3) at 2–4 g/L. The ratio of CrO3 to SO4²⻠is maintained at 100:0.9–1.05. The temperature is set to 52°C, with a current density of 25–35 A/dm² and a voltage of 6–8 V. The duration depends on the required thickness. After plating, the parts are rinsed in a recovery tank, washed, and then rinsed with hot water. Finally, they are dried, cooled, and subjected to a self-test to ensure quality.
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