Manganese phosphating

Manganese phosphating is a chemical dipping process that ensures a good, uniform surface treatment regardless of workpiece geometry. Manganese phosphating is the hardest of the phosphating coatings and provides a good improvement in the frictional properties of sliding components. The process provides a certain corrosion protection which is significantly improved by a subsequent oil treatment.

The process is used on steel and castings to prevent adhesive wear when running in e.g. gearboxes, mechanical parts in engines, bearings etc. Manganese phosphating is best for steel with lower than 3% chromium content.

Surface treatment with manganese phosphating is produced by a dipping process in a vessel and the layer thickness varies from approx. 1.5 to 8 μm with a basis weight of 7-30 g/m2. The color varies from dark gray to black depending on the alloy composition of the base material. The coating meets the requirements of DIN EN 12476-Fe/Mnph g f.