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Section E, on phosphate treatments, of Subcommittee V of ASTM Committee B-8, on Electrodeposited Metallic Coatings was organized for “the general purpose of studying phosphate coatings on zinc plate and suggesting means of evaluation.” This paper is based on two progress reports prepared for committee distribution. The results are significant, and inasmuch as substantial conclusions are justified, it seems appropriate to present the data now available. The properties of phosphate coatings judged to be of most interest are: (a) Adhesion of organic films. (b) Retardation of under-surface corrosion at points of rupture in organic film. (c) Resistance to accelerated and normal outdoor exposure. (d) Corollary to the foregoing, it is necessary (1) to establish an accurately reproducible method for determining the amount of phosphate on a zinc surface, and (2) to correlate the amount (weight) of phosphate coating with differences in the above properties. Information pertaining to (c) and (d) only is presented in this report. This is a continuing project, and the report is necessarily limited to a summation of progress to date.
Alexander, Allen L.
U. S. Naval Research Laboratory, Washington, D. C.