Yellow, Green, and Black Passivation Services refer to the application of trivalent or hexavalent chromium passivation layers on zinc or zinc-alloy plated parts to enhance corrosion resistance and achieve distinct finishes. Each color of passivation offers different characteristics and benefits, allowing for a wide range of applications.
Yellow Passivation is achieved through either trivalent or hexavalent chromium-based treatments, with the trivalent version being more environmentally friendly. This passivation process imparts a yellow to gold-colored finish and is widely used for its corrosion resistance.
Green Passivation typically involves a trivalent chromium process that results in a greenish finish. This type of passivation is less common but is used in specific applications where color coding or aesthetic considerations are important.
Black Passivation is typically performed using trivalent chromium solutions and is valued for its sleek, dark finish and excellent corrosion resistance. This passivation process is commonly used in industries where both aesthetics and protection are important.