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How Do Phosphate Coatings Reduce Wear on Moving Parts
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English
Abstract
The benefits provided by phosphate coatings in reducing wear are ascribed to the controlled etching of the surface subjected to wear. Through tests it appears that the manganese phosphate coating is the most effective application, the reason being the number of larger pits formed by manganese phosphate and the greater amount of phosphate retained in these pits.
Chemical reactions involved in the production of these coatings are reviewed together with a comparison of the reactions involved in some of the common phosphate coating baths. The effect of treatment of metal surface prior to coating and the type of coating bath used are compared by examining the coatings as produced and after burnishing.
These coatings have been reported to provide wear resistance by removing surface irregularities after machining and lapping, increasing lubricating efficiency, and preventing welding under loads.
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Citation
Cavanagh, W., "How Do Phosphate Coatings Reduce Wear on Moving Parts," SAE Technical Paper 670041, 1967, https://doi.org/10.4271/670041.Also In
References
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- Darsey V. M. Cavanagh W. R. “Formation and Application of Phosphate Coatings.” Transactions of the Electrochemical Society 91 1946
- Gilbert L. O. “A Study of Phosphate Treatment of Metals.” Technical Proceedings of the American Electroplaters Society 43 1956 195
- Gilbert L. O. “Accelerators and Their Function in Phosphating Solutions.” Technical Proceedings of the American Electroplaters Society 44 1957 73
- Long C. F. “Phosphating as a Wear Resistant Coating for Ferrous Surfaces.” Scientific Lubrication September 1965
- Bidwell J. “Rolling Contact Phenomena.” Elsevier Publishing 357
- Mansion H. D. “Effect of Chemical Surface Treatment on the Scuffing of Gears.” Institution of Automobile Engineers December 1943