![]() This usually causes one part of the object to corrode at the expense of another. Physical damage to painted or coated surfaces, or the uneven application of oil coatings for example, will alter the access of oxygen to the metal surfaces. Oils and sweat from people’s hands are potential agents of decay, with the organic acids and chloride ions transferred upon contact between skin and metal, capable of causing significant attack on metallic surfaces.Īny agent that affects protective films on metals may enhance corrosion of the underlying metal. These latter materials do not form a coherent surface layer, effectively removing the corrosion resistance of the metal. They can speed up the corrosion rate and are capable of penetrating protective oxide layers on metals such as copper and aluminium to form metal chlorides. Chloride ions, present in common salt (sodium chloride), may originate from human or animal contact (perspiration) or from airborne sea salts. Moisture and oxygen are required for corrosion (oxidation) of metals to occur.
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