Microgalvanic aspects of the seawater corrosion of marine materials in the presence of hypochlorite ion fouling inhibitor.
Graham, Kenneth Judson
Reinhardt, Richard A.
Miles, Melvin H.
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This corrosion research has been conducted in two ways: microscopically and electrochemically . In the microscopic portion has been studied the mode and distribution of attack on metal coupons immersed in corrosive fluids. Here could be observed the effects of alloying, the corrosion product morphology, selective phase corrosion, and base metal microstructure . Both optical and scanning electron microscopy were used. In the electrochemical portion has been examined the effects of varying the corrosive electrolyte from synthetic seawater alone to one containing a marine fouling inhibitor, sodium hypochlorite. Here, corrosion rates were obtained for the specimens in the various corrosive media by a variety of methods. These ranged from rather simple controlled immersion tests to the more sophisticated electrochemical measurements such as linear polarization and potentiodynamic polarization. Chemical and x-ray analyses were performed on the corrosion products. The information gained from these two parts was integrated to provide predictions as to the suitability, probable rate and failure mode for each of the materials studied.
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