Published: Jan 1978
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The development of a synthetic patina process for copper metals is described. The chemistry of the process essentially parallels the natural atmospheric corrosion of copper. Various stages of the patination system are illustrated via scanning electron microscopy (SEM) photographs.
The development of organic resin-based coating systems are described, including passivation systems, solvent selection and resin screening techniques. An accelerated weathering test program for evaluation of clear coatings is detailed. Field evaluation at various test sites are correlated with coating properties. They illustrate the effect of atmospheric contaminants, sea spray contamination, and high ultraviolet intensity exposure effects as they pertain to coating life.
Field tests of the inorganic patina and of both an organic lacquer and a shop-applied film coating system are described indicating the potential durability of the system.
corrosion, atmospheric corrosion, copper metals, patina coatings, accelerated tests, synthetic finishes
Consultant, International Copper Research Association, Inc., NY, NY