Zinc phosphating

manganeseISO 9001for the petrochemical industry

Phosphate Coatings Phosphating (also known under the trade name as Parkerizing™) is the chemical deposition of zinc or manganese onto a part. The difference between the two types is primarily in the grain size of the crystals created during the process. The zinc phosphate tends to be a finer crystalline pattern, while manganese phosphate produces one that is more course. These patterns create more surface area on the part and an improved anchor profile for better adhesion for a subsequent coating. They also provide increased corrosion protection when applied with another coating. Benefits: • Prolong the life of organic coating • Provide good paint bonding • Improve corrosion resistance by providing a good base for absorbing and retaining rust preventative materials • Provide an excellent base for holding lubricants and drawing compounds Below is the most common specification for phosphate coating. MIL-DTL-16232G Type Z: Zinc phosphate coating Class 4 – With no supplemental coating or coating as specified Type M: Manganese phosphate coating Class 4 – With no supplemental coating or coating as specified