Methods of Obtaining Improved Outdoor Corrosion Resistance with Nickel + Chromium Plate

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Abstract
The outdoor corrosion resistance of chromium plated, polished Watts nickel is compared with that of bright nickel, and the following systems of composite plates are also reviewed. 1. Bright, crack-free chromium in thicknesses of 0·03 to 0·08 mil (0·75 to 2 micron) on nickel or copper+nickel plate. 2. The usual 0·01 mil chromium on dual or duplex nickel plate consisting predominantly of a thin overlay of bright nickel on a deposit of soft, semi-bright, sulphur-free nickel. 3. Dual or duplex microscopically cracked bright chromium plate of 0·03 to 0·1 mil thickness deposited on nickel or copper+nickel. 4. Chromium+nickel+chromium composite deposits. Systems 2 and 3 are the best in use to date. System 2 is well established and in more widespread use than the newer system 3. The latter system appears to offer considerable promise, but the outdoor exposure tests (1 year) are not yet of sufficient duration for its proper evaluation. System 4 has not yet been tried under production conditions, but the results of extended outdoor exposure tests (4 years) indicate that it is capable of showing the best overall corrosion resistance. Combinations of all these systems are also discussed.

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