MIL-DTL-16232 Type M
This corrosion resistant coating reduces wear on pistons, rings, liners, camshafts and other bearing surfaces. It's use encourages rapid break in of moving parts by preventing metal-to-metal contact between bearing surfaces. This coating also increases the lubrication of treated surfaces and removes light metal scratches caused by machining.
Manganese phosphate has the superior hardness, highest corrosion protection and best wear resistance properties of the phosphate coatings. It is used extensively to increase the sliding properties of engine, gear, and power transmission systems. The use of manganese phosphate coatings for improved corrosion resistance can be found in all areas of the metal working industry.
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