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Four case histories of service failures attributable to some form of localized corrosion attack are reviewed. The initial case history covers a problem that developed because of the failure to follow operational procedures and because the wrong chemical was used for the inhibitor. The second case history covers an instance where the conjoint actions of the environment and cyclic loading (fatigue) promoted accelerated localized pitting attack rather than the usual loss in fatigue strength generally associated with corrosion fatigue. The third case history presents the potential concerns in using an improperly controlled corrosion protection system. The final case history reveals the perils of allowing systems to remain partially filled with stagnant solutions.
A major concern is the possibility that the same type of failures will recur. An approach for possible actions in programs for the prevention of premature corrosion failures is recommended.
corrosion, failure analysis, corrosion prevention, carbon steels, protective coatings control, corrosion fatigue
Principal engineer, Knolls Atomic Power Laboratory, General Electric Company, Schenectady, N. Y.