Corrosion Rates in the Dew-Point Zone of Superheated Steam
- Key words
- geothermal, geochemical, carbon steel, stainless steel, chloride corrosion, Larderello
- Conference
- World Geothermal Congress
- Year
- 2000
- Session
- Power Generation
- Language
- English
- Paper number
- R0739
Full text
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Abstract
The corrosion rates of carbon steel and 13% Cr stainless steel when superheated steam begins to condense on the metal surface were experimentally measured. Generalised and pitting corrosion in the geothermal fluid was monitored by weight-loss in steam-inserted cooled coupons. In these conditions, the surface is wetted by an acid film due to the hydrogen and ammonia chloride dissolution. Tests were made in several steams with chloride concentration ranging between 0 and 10 ppm. The correlation y=0.315. [Cl]steam has been determined as the relationship between the corrosion rate and chloride content.
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