The accelerated internal corrosion in boiler evaporators results from an unfavorable coincidence of adverse thermohydraulic conditions, boiler water contamination, and fabrication defects. Boiler tube material (medium carbon steel, Type SA210) was exposed in static autoclaves to aqueous solutions of HF, FeF3, and NiF2 at 300 C, and the rate of attack and morphology of the resulting scales were established. For comparison, parallel tests were conducted in aqueous solutions containing chloride ions. This work establishes the role played by fluoride contamination of the boiler water.

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National Association of Corrosion Engineers
1984
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