Stress Assisted Corrosion (SAC) of boiler tubes and economizer tubes from the waterside is one of the major problems in availability loss and safety of power plants and industrial boilers. Use of carbon steel for the service of high temperature water applications strongly depends upon formation and stability of the protective oxide film of magnetite, Fe3O4, on the waterside surface of boiler tubes. Failure mechanisms involved in waterside SAC surely includes film damage as an important step. To understand SAC, a recirculation loop autoclave facility for high temperature water testing was set up. The autoclave was designed for tests under industrial boiling water conditions. The maximum operational temperature is 350°C, with test pressures of up to 3500 psi and flow rates of up to 10 liters per hour. Boiler water chemistry can be changed during the test and the dissolved oxygen can be controlled within the range of 10 ppb - 32 ppm. Initial tests were conducted to develop magnetite film on carbon steel tube samples at different temperatures.

Subject
Steel surfaces, Corrosion fatigue, Water, Tubes, Autoclaves, Oxide films, Water chemistry, Stress, Oxide surfaces, Film formation, Boilers, Magnetite, Carbon steel
Keywords:
Stress Assisted Corrosion, SAC, Boiler Tubes, Waterside corrosion, High Purity Water, Carbon Steel, Weld Attachments, Corrosion Fatigue, Industrial Boilers
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2004
Association for Materials Protection and Performance (AMPP)
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