ZNP-54 PHOSPHATING Here’s a detailed overview of ZNP‑54 Zinc Phosphating Chemical, often used as a specialized cleaning and conversion‑coating process for metal castings — it’s particularly relevant if your earlier mention of “casting cleaner” and follow-up refers to pre‑painting or corrosion‑resistant preparation. ZNP-54 phosphating refers to a type of metal surface treatment process known as zinc phosphating using the ZNP-54 formulation. This process involves the application of a chemical solution containing zinc phosphate onto metal surfaces to enhance their corrosion resistance and improve paint adhesion. Here's a breakdown of the ZNP-54 phosphating process: 1. Purpose: The primary purpose of ZNP-54 phosphating is to prepare metal surfaces, such as steel or iron, for subsequent painting or coating by providing a clean, corrosion-resistant, and paint-adherent surface. #ZNP-54 PHOSPHATING Manufacturer.