YELLOW CHROMATISING CHEMICAL A yellow chromate chemical refers to a substance used in a process called chromate conversion coating, commonly used to provide corrosion resistance and improve paint adhesion on metal surfaces, particularly aluminum and zinc. The yellow chromate coating is often referred to as yellow chromate or yellow passivate due to its characteristic yellowish appearance after treatment. Here are some key details about yellow chromating: Purpose: Yellow chromate treatment is primarily used to provide corrosion protection to metal surfaces, particularly aluminum and zinc alloys. It also serves as a base for subsequent painting or coating applications. Chemical Composition: The yellow chromate chemical typically contains hexavalent chromium compounds, such as potassium dichromate or sodium dichromate, along with various additives like accelerators, inhibitors, and buffering agents.