Criteria for Continuous Active Growth of Localized Corrosion in Water Piping

概要

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Criteria for continuous active growth of two types of localized corrosion in utility water piping, i.e., groove corrosion of the electric resistance welded pipes and pitting corrosion under tubercles, were proposed, based on consideration of conditions under which no adherent corrosion product films form on the anodic areas, and the potential differences between the anodic and cathodic areas are maintained. For the groove corrosion, it was concluded that if the rate of corrosion is 0.9mm/yr or higher, a sufficient amount of Fe^<2+> ions are formed to diffuse into the solution and consume all diffusing oxygen, forming Fe(OH)_3 away from, and not close to, the steel surface. For pitting corrosion associated with tuberculation, the formation of effective tubercles is the only requirement, because Fe^<2+> ions cannot precipitate as adherent film in the absence of oxygen under the pH condition in the anolyte.
前橋工科大学の論文
2001-03-25