Corrosion mechanisms remain a major cause of tube failures in operating boiler units. Conditions resulting in caustic corrosion, acid corrosion, chclant corrosion and sulfate induced high temperature external corrosion of boiler tubes are reviewed. Three case histories are presented illustrating the impact of the conditions discussed on boiler tube failures.
Keywords: Boilers, tube failures, caustic corrosion, acid corrosion, chelant corrosion, high temperature corrosion