Chrome plating is a manufacturing technique where a thin layer of chromium is coated over another metal. The chrome is sometimes simply decorative, but it typically also offers a variety of industrial benefits, such as reduced friction, protection against corrosion, and a longer lifespan of the part. Below are several steps in the chromium plating process.

How Chrome Plating Works

1. Stripping

The first step is to strip the product down to bare metal to allow the chromium layer to adhere to it. Through various techniques—including sandblasting the metal and putting it in baths of caustic soda—layers of paint, oil, rust, and other contaminants are removed to prepare for the application of chromium. The metal is then rinsed in clean water to remove residue and prevent cross-contamination between the different chemical baths.

2. Repair & Straightening

Parts may require some restoration before they are ready for electroplating. They may need to be straightened, bent into their proper shape, or have cracks or holes filled to make sure they are properly aligned when they are coated. To fill any gaps in the metal, technicians often use brass or lead.

3. Polishing

Once the part is shaped properly, it is polished to be completely smooth. A series of progressively less-abrasive wheels or belts buff the metal until it's free of any lingering imperfections, leaving it shiny and highly polished. Polished materials are then attached to copper wires and hung on racks in preparation for electroplating baths.

4. Copper & Nickel Plating

The racks of metal are dunked into a bath of a copper sulfate solution, and an electric charge is applied. The copper adheres to the surface of the product, filling any microscopic imperfections. The racks are removed from the bath and given time to dry. Then, the process is repeated with a 60-minute bath of nickel sulfate, which coats the parts in nickel and gives them a reflective surface. The parts are then rinsed to prepare for the chrome application.

5. Chrome Plating

The final step is a short bath in chromic acid with a 12-volt current running through it. The result is a shiny, chromium coating that is 3 microns (0.003 millimeters) thick over the metal parts. The product is rinsed a final time, and a quality control officer inspects the it to ensure it meets chrome plating standards.

If your business needs dependable chrome plating service, contact Porter-Guertin Co. in Cincinnati, OH. They offer fast, affordable service and specialize in all types of industrial metal finishing. Learn more about them by visiting their website or call (513) 241-7663 to discuss chrome plating options and pricing.