There are many formulas for chromium plating electroplating solutions. The most common and widely used one is an aqueous solution of chromic anhydride and sulfuric acid, and then different additives are added, such as fluorosilicic acid, or strontium sulfate and potassium fluorosilicate, etc., which are divided into composites. Chrome plating liquid, rapid chrome plating liquid, etc. (If you are interested, please refer to relevant professional books)
The electrolyte for chromium plating is placed in a special plating tank. The plating tank is connected to a low-voltage DC power supply and uses lead as the anode.
Metal products and mechanical parts that require chromium plating (such as steel parts, copper parts, etc.) undergo processes such as grinding or polishing, degreasing, pickling, and water cleaning, and then hanging on a special hanger. The plated parts are immersed in the electroplating solution, and the hanger Connect to the cathode. When the direct current is turned on, the chromium ions in the plating solution are reduced on the plated part (cathode) to form a chromium coating.
Due to different uses, chrome plating processes are divided into: hard chrome plating, milky chrome plating, loose chrome plating, black chrome plating, and protective-decorative chrome plating.
Hard chrome plating, milky chrome plating, loose chrome plating, and black chrome plating are mainly used in industry to improve the hardness, wear resistance, corrosion resistance, etc. of mechanical parts.
Decorative chrome plating is commonly used in civil metal products. This kind of chromium plating is relatively thin. In order to improve the anti-corrosion performance and service life of chrome plating, steel and zinc alloy products need to be plated with other metals (intermediate layer) before chromium plating. Such as copper, copper alloy, nickel plating, and then chromium plating.
Decorative chrome plating is often used for the protection and decoration of automobiles, bicycles, sewing machines, clocks, instruments, lamps, daily hardware and other parts.
