Trivalent Yellow Passivation is a type of post-treatment applied to zinc-plated components to enhance corrosion resistance and provide a yellowish, iridescent finish. Unlike traditional hexavalent chromate coatings, trivalent passivation is environmentally friendly and compliant with RoHS regulations, making it a safer alternative. This process forms a thin, transparent to slightly yellow layer that offers good corrosion protection, especially when combined with a sealer or topcoat. It is widely used in automotive, electrical, and general engineering applications where both performance and compliance are essential.
