• Phosphate Coatings Are Often Used To Provide Corrosion Resistance. However, Phosphate Coatings On Their Own Do Not Provide This Because The Coating Is Porous.
• Therefore, Oil Or Other Sealers Are Used To Achieve Corrosion Resistance. This Coating Is Called A Phosphate And Oil (P&O) Coating. Zinc And Manganese Coatings Are Used To Help Break In Components Subject To Wear And Help Prevent Galling.
• Most Phosphate Coatings Serve As A Surface Preparation For Further Coating And/Or Painting, A Function It Performs Effectively With Excellent Adhesion And Electric Isolation. The Porosity Allows The Additional Materials To Seep Into The Phosphate Coating And Become Mechanically Interlocked After Drying.
• The Dielectric Nature Will Electrically Isolate Anodic And Cathodic Areas On The Surface Of The Part, Minimizing Under Film Corrosion That Sometimes Occurs At The Interface Of The Paint/Coating And The Substrate.