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The project objective was to determine the effects of production procedures on the characteristics of electroless nickel coatings. Deposition rate, phosphorus content, hardness, appearance, and metal distribution are reported for deposits from several hypophosphite type electroless nickel baths, both proprietary and non-proprietary. The baths were operated under a variety of conditions with variations of composition. Extensive data are given on the relation of deposit hardness to phosphorus content and to heat treatment at 100, 200, and 400 C. Some data are given relative to electroless Ni-B, Ni-P-Cu, and Ni-P-Mn alloys.

This paper is the third published report on the results of a broad program on properties of electrodeposited copper, sponsored jointly by the American Electroplaters' Society, The International Copper Research Association, Inc., The Copper Development Association, and the National Bureau of Standards. The first paper is a comprehensive review of the literature to 1965. The second paper is an interim report on experimental results. The present and final paper, which incorporates the data in the second, includes data from the baths designated in the title, for deposits prepared under a wide range of operating conditions and with use of a variety of addition agents. Properties measured include tensile strength, yield strength, elongation, modulus of elasticity, fatigue strength, hardness, internal stress, density, electrical resistivity, and thermal expansivity. Properties were measured for as‐plated deposits, deposits after annealing at several temperatures, after cold‐working, and at low and high ambient temperatures. Structure of deposits was examined by optical, electron micrograph, and x‐ray methods. Content of impurities in deposits was determined. Correlations are developed among properties, structure, impurity content, type of bath, and operating conditions.