This report covers a study made to evaluate the effect of £5ppm of an octyl ortho-phthalate ester and varied amounts of iron contamination on the hardness of nickel plate deposited from a Watts-type nickel plating bath. The effect of iron contamination on the plate hardness was evaluated at 200, U00, 800, and 1,200 ppm in the bath. The amount of iron codeposited with the nickel at the various levels of iron contamination in the bath was also evaluated.
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