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Atmospheric corrosion problems in secondary fiber plants



Atmospheric corrosion problems in secondary fiber plants



Enzyme & Microbial Technology 1(3): 205-209



In contrast to the normal problems of H2S corrosion when closing the water circuits of a secondary fiber plant, Papierfabriek Gennep was confronted with the problem of atmospheric corrosion: the formation of oxides, sulfates and sulfides on the metal surfaces in the atmosphere above the water circuits. Cu alloys in motors, neon light fixtures and instrument piping were affected by this rapid corrosion process, especially whenever wood-free coated paper was being de-inked in the secondary fiber plant. This atmospheric corrosion can be explained by the decomposition of formyl-S-coenzyme A into unstable performic acid, which is a strong oxidizing agent, before breaking down into CO2 or formic acid. The formyl-S-coenzyme A is the enzymatic degradation product of fatty acids used in the de-inking process. The required enzymes can be produced in an anaerobic environment by various anaerobic bacteria feeding on the nutrients in casein-coated paper.

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