In order to determine the relative protective values of different electroplated coatings on steel, exposure tests were conducted during the past 2 years through cooperation of the American Electroplaters' Society and American Society for Testing Materials with the National Bureau of Standards. The details of the experiments and inspections were arranged by a joint committee. The experimental work was conducted at the Bureau by the Research Associoate of the American Electr'oplaters' Society with the assistance of various members of the Bureau staff.

This report is confined to those coatings in which the outer layer was nickel or chromium, sometimes with intermediate layers of copper, and occasionally of zinc or cadmium. Specimens plated only with zinc or cadmium were exposed simultaneously, but as these have thus far shown failure in only three locations, the results will be reserved for later publication.

As part of this investigation, accelerated tests and their relation to the results of atmospheric corrosion were studied. A study was also made of methods for stripping electro deposited coatings to determine their weight and average thickness. The results of these investiga tions will be published m later papers.

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