The Application of Heat and Corrosion Resistant Phosphate Coatings Under Steam Pressure
ROCK ISLAND ARSENAL IL GENERAL THOMAS J RODMAN LAB
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Processing methods to produce zinc and manganese phosphate coatings with greater heat and corrosion resistance on ferrous items were investigated. Conventional phosphating solutions enriched with salts of the alpha-reactive- carboxylic-acids, such as manganese salts of citric, tartaric, and gluconic acids were processed under steam and atmospheric pressure. Manganese carbonate and manganese dihydrogen phosphate were added to control the free and total acids. Evaluations were made of the coating weight, amount of iron etched from the surface, loss of coating weight due to thermal exposure, and resistance of the coatings to heat and corrosion in the salt-spray tests.
- Coatings, Colorants and Finishes