Manganese phosphate coating is the treatment of irons or steels with a dilute solution of phosphoric acid and selected proprietary chemicals which produces a crystalline, oil absorptive coating with excellent wear resistance.
During the continuous immersion process grain refiners are incorporated into the sequence prior to transfer into the maganese phosphate solution. The grain refiners influence the deposition of small crystals and control the finish on a microscopic level. Coating weights can be up to 40g/m2 and the coatings are used to enable the break in of new parts such as pinions, gears, camshafts and bearings.
The crystalline structure on the componenet surface retains a large quantity of lubricant and rust inhibiting oil thereby reducing galling in moving parts. In addition when used for bearings the coatings enable a continuous film of lubricant, which improves wear resistance.