Abstract
Abstract It had been shown previously that complete protection of sheath could be effected in a constant current system even in the presence of high salt content and pH. The relationship of protective potentials to pH and salt concentration has now been established for commercial lead sheath alloy composition and is shown to be substantially the same as given in the Pourbaix diagram for pure lead. The use of a potential gradient for lead cathodes was developed to provide simulated duct tests. The data from the gradient tests provided information on the effects of salt concentration, pH and potential on the corrosion behaviorism of lead when fully immersed and partially immersed. The criteria for effective cathodic protection are shown to be different for the portions of the lead cathode below, at and above the water line. The most severe corrosion conditions at the air-solution interface require a more negative voltage for protection than below the interface. The distribution of potential along the gradient as a function of salt content, type of salt and current input to the cell shows some important aspects to be considered in the field as possible regions of corrosion hazard. 7.7
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