Corrosion of nails in CCA- and ACA-treated wood in two environments

In 1973, nails of 11 different alloys and coatings were driven into southern pine treated with chromated copper arsenate or ammoniacal copper arsenate. One set of samples was exposed to 97 to 100 percent relative humidity at 80?F (27?C) for 14 years. Another set of samples was buried in soil for 17 years at the Valley View Exposure Site in Madison, Wis. The samples were compared for nail corrosion, as measured by weight loss. The results indicated that for long service life, metals that are to be used in contact with treated wood in moist conditions should be cathodic to copper in the moist treated wood. Types 304 and 316 stainless steel, silicon bronze, copper, and monel nails were shown to be suitable for these conditions. Aluminum nails and steel nails coated with zinc, tin, and tin-cadmium were not suitable.

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