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Plating is the application of a metallic layer to a base layer. There are several application methods including but not limited to:
A metallic coating is most likely applied by spraying or electroplating.
Electroplating is the process of applying a metal coating to a part immersed in an electrolytic solution through an applied or induced electric current. Metal coatings may include Cadmium, Chromium, Cobalt, Copper, Gold, Indium, Iron, Lead, Nickel, Platinum, Silver, Tin, Zinc, Brass, and Bronze. Electroplating is widely used in industries such as automotive, avionics, aeronautics, electronics, jewelry, and toys. The coating produced is usually for decorative and/or protective purposes or enhancing specific properties of the surface.
Hexavalent Chromium electroplating causes the formation of hydrogen gas at the cathode. The gas rises to the surface of the plating bath causing the formation of a chromic acid mist which is a hazardous air pollutant.
More specific information regarding Chromium Electroplating Operations and Plating and Polishing Operations is available. Environmental compliance in the plating industry [PDF] was presented at the Indiana Chapter of the National Association for Surface Finishing (NASF) meeting on September 15, 2015. The Chromium Emissions from Hard and Decorative Chromium Electroplating and Chromium Anodizing Tanks National Emission Standards for Hazardous Air Pollutants (NESHAP), Perfluorooctane Sulfonic Acid and Perfluorooctane Sulfonate (PFOS) alternatives, the Solvent Contaminated Wipes exclusions found at 40 CFR 261.4(a)(26) and 40 CFR 261.4(b)(18), the ten most common hazardous waste violations, and Rule 6. Stormwater Discharge Exposed to Industrial Activity were topics discussed.
Additionally, the Compliance Technical Assistance Program (CTAP) may be contacted at (800) 988-7901 for confidential assistance. A CTAP consultation request can be made as well.