Abstract
AbstractLewis and Evans1 examined the corrosion of steel produced by drops of 0.001 M sodium chloride solution applied to a film of paint, which had been interrupted by the engraving of a standard scratch line. They found that zinc dust, zinc oxide and a number of lead compounds prevented corrosion at the scratch line. The role of lead compounds has been examined by the author,2 and it has been established that inhibition is associated with the formation of lead soaps. In the case of zinc dust it has been shown3 that when the zinc dust content of the paint film is sufficiently high, the steel may be protected cathodically. Zinc oxide cannot function in this manner, nor can zinc dust do SO when the paint film contains less than a certain amount.The following investigation has been carried our in order to establish the way in which various zinc pigments inhibit corrosion.
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