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Hexavalent chromium plating macomb8/19/2023 ![]() ![]() Organizations representing the functional hard hexavalent chromium industry have the option to present periodic technology reviews to CARB staff. Beginning after 15 years after the effective date of the Amendments, CARB staff are proposing that all functional hard hexavalent chromium electroplating facilities must transition to trivalent chromium or another cleaner hexavalent chromium-free alternative, or stop using hexavalent chromium.Beginning after two years after the effective date of the Amendments, CARB staff are proposing that no person shall install or operate any new functional hard hexavalent chromium electroplating facility in the state.Beginning two years after the effective date of the Amendments, CARB staff are proposing that all decorative plating facilities must convert to the use of trivalent chromium or cleaner alternative or stop using hexavalent chromium.The proposed complete phase-out dates for the use of hexavalent chromium at electroplating and chromic acid anodizing facilities are as follows: The Proposed Project would require the use of the trivalent chromium plating process for all decorative and functional hard chromium plating facilities. Exposure over a lifetime to very low hexavalent chromium concentrations can substantially increase a person’s chance of developing cancer. These electrolytic processes cause mists containing hexavalent chromium to be ejected from the plating tank which is eventually emitted into the outdoor air. During chromic acid anodizing, an oxidation layer is generated on the surface of the part. The most familiar type of chromium plating is the decorative chromium plating process which provides a bright, shiny finish onto objects such as wheels and plumbing fixtures. The electrical charge causes the chromium metal particles in the bath to fall out of the solution and deposit onto objects placed in the plating solution. ![]() An electrical charge is applied to a tank (bath) containing an electrolytic salt (chromium anhydride) solution. Hexavalent chromium plating, or simply chromium plating, is the electrical application of a coating of chromium onto a surface for decoration, corrosion protection, or durability. Hexavalent chromium was determined to be an extremely potent human carcinogen with no known safe level of exposure. In 1986, CARB identified hexavalent chromium as a toxic air contaminant (TAC). ![]()
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