Black metal plating method using the same for copper plate with low emissivity and high absorption of solar energy

摘要

PURPOSE: A continuous and automatic electrode position method of environment-friendly black potassium chromium sulfate plating having low emissivity and high absorption rate is provided to improve the performance of the endothermic plate through an automatic series coating process. CONSTITUTION: A continuous and automatic electrode position method of environment-friendly black potassium chromium sulfate plating having low emissivity and high absorption rate is as follows. A copper metal plate is washed in 50~60C for 1~3 minutes(10). After a rinse step(20), the copper metal plate is plated in a specific solution for 1~3 minutes using anode Ti basket +S round Ni(Nickel) in 50~55C as an electric current density of 35(30). The solution is manufactured by mixing surfactant of 1~2cc, boric acid of 41g, nickel chloride of 68g, and nickel sulfate of 300g, in water of 1 liter. The copper metal plate is activated in sulfuric acid of 10% in room temperature for 1~3 minutes(50) after a rinse step(40). The copper metal plate is plated in the plating liquid in 20~35C as the current density of 40 at a plating rate of 0.002~0.008mm/min(70) after rinse step(60). The copper metal plate is dried with hot air of 70~80C(90) after a rinse step(80).