about chrome Plating
The chrome plating process is a method of applying a thin layer of chromium onto a substrate (metal or alloy) through an electroplating procedure.
In simple terms, electroplating is achieved by passing an electric current between two electrodes which are immersed in an electrolyte bath comprising of chromic acid. One of the electrodes will be the substrate which is to be plated. During the flow of electricity between the two electrodes, chromium atoms are deposited in a layer on the electrode to be plated
- Etching: The parts are immersed in sulfuric and chromic acids which etches tiny holes in its surface. The holes contain a coating of metal that is applied while it is being processed in the electroless plating process.
- Neutralization: The plastic part is then submerged in a special alkaline mixture neutralizing the acid to keep it safe from erosion.
- Catalyzation and Acceleration: A final bath is used to clean the part. All chemicals must be removed before the chrome plating process can begin. The final bath accelerates the film to prepare it for the final plating. After the part is cleaned, a catalytic film is applied to its surface.
- Electroless Plating: A thin layer of copper and nickel are applied after the etching, neutralizing, and catalyzing processes are completed.
- Electro-Plating: A negative charge is applied to the part after the electroless plating process is complete. A tank for chrome dipping contains positively charged ions which are attracted to the copper or nickel that was negatively charged during the electroless plating process. The chrome plating should be even so that it will easily pass inspection.
- Quality Inspection: All parts have to be inspected to ensure they have an even coat of plating with no discrepancies of any kind.