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Corrosão e Protecção de Materiais

Print version ISSN 0870-1164


MARTINS, J.I.  and  MARTINS, C.M.B.. Pitting corrosion of 304 stainless steel in an activated carbon filter. Corros. Prot. Mater. [online]. 2016, vol.35, n.1, pp.21-25. ISSN 0870-1164.

Water leakages of an orange color were found in the cross welding zone and barrel of an activated carbon filter used in a wastewater treatment plant. The analysis of the chloride content in the plant flowsheet showed that the equipment was subjected to unsuited chloride concentration for 304 stainless steel resistance to pitting corrosion. The inside shows holes distributed randomly from about 20 cm above the welding zone to the lower outlet port of the equipment. The rehabilitation of the equipment was made by replacing the damaged cylindrical part and performing an inner liner of polymer matrix composite. It was recommended to eliminate the entry of oxidants in the filter, and a better control of coal saturation.

Keywords : Stainless Steel 304; Ping Corrosion; Activated Carbon Filter; Hypochlorite; Welding; Composites.

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