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Automotive Experiences with Phosphate and Oil Coatings
ISSN: 0148-7191, e-ISSN: 2688-3627
Published February 01, 1970 by SAE International in United States
Annotation ability available
Event: Mid-Year Meeting
Automotive requirements for phosphate and oil coatings, as applied to a variety of parts such as nuts, bolts, washers, fasteners, hood hinges, and brackets, are primarily based on the corrosion protection provided by the coating system.
The automotive specifications covering the degree of corrosion resistance required, for a given application, normally stipulate the neutral salt spray test as a means of evaluating the quality of the coating system and may vary 24-168 hr of exposure time.
To comply with these corrosion resistance requirements, part suppliers use a number of proprietary phosphatizing processes in combination with an even larger number of specially compounded rust preventative petroleum products, either as water emulsions or solvent cut-backs. Some of these combinations of phosphate and oil systems have been more successful in consistently meeting the corrosion resistance requirements, as measured by the neutral salt spray test.
This paper presents the results of two independent evaluations of the corrosion protection afforded by a variety of phosphate and oil coating systems. In addition, the corrosion protection of these systems as measured by a new test method is briefly discussed.
CitationSukes, G., "Automotive Experiences with Phosphate and Oil Coatings," SAE Technical Paper 700461, 1970, https://doi.org/10.4271/700461.
- Kojima J. L. “Corrosion Evaluation of Phosphate Fasteners by Ferrotest.” Paper 700007 SAE Automotive Engineering Congress Detroit January 1970
- Saur R. L. Basco R. P. “An Accelerated Electrolytic Corrosion Test and a Corrosion Analysis Procedure for the Nickel-Chromium Plating System.” Plating 53 1969 35
- France W. D. Chance R. “Anodic Polarization Characteristics of Phosphated Steels.” Corrosion 25 1969 329