part to the randomness of spray package corrosion. The chemical composition of your formula determines which material on the package metal surface will or will not corrode. The chemical composition of your formula also determines the strength of bonds between the metal and a coating or a laminate film and the distribution of strong and weak bonds over the spray package metal surface. Please send your questions/comments/suggestions to rustdr@pairodocspro.com. Back issues of Corrosion Corner are available on CD from ST&M. Thanks for your interest and I’ll see you in April. SPRAY Spray March 2013 27 strong and others will be very weak. For example, polymer and laminate films bonds with precipitates are typically weaker than the corresponding bonds with metal grains. Consequently, the polymer coating and laminate film will also have a random variety of different bonds on the spray package metal surface. In summary, the surface of a metal container consists of a) a variety of different metal grains, b) different types of grain boundaries, c) inclusions, and d) defects in the grains. The distribution of each grain, grain boundary, precipitate, inclusion and defect is random, thus the exposure of each type of material to your formula is also random. This randomness contributes in The surface of a metal is a complex, inhomogeneous mixture of several types of metallurgies.
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