Materials selection for dew-point corrosion in geothermal fluids containing acid chloride

[Display omitted] •General corrosion, pitting and stress corrosion cracking characterization of a large number of stainless steel, nickel alloys and titanium alloys.•Material selection criteria for geothermal energy production.•Definition corrosion susceptibility maps for corrosion resistant alloys...

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Bibliographic Details
Published in:Geothermics 2017-09, Vol.69, p.139-144
Main Authors: Cabrini, M., Lorenzi, S., Pastore, T., Favilla, M., Perini, R., Tarquini, B.
Format: Article
Language:English
Subjects:
Acid chlorides
Alloy steels
Alloys
Austenitic stainless steels
Chromium
Continuous flow
Corrosion
Corrosion resistant alloys
Crevice corrosion
Dew
Dew point
Dew point corrosion
Duplex stainless steels
Ferritic stainless steels
Geothermal fluids
Geothermal power
Localized corrosion
Martensitic stainless steels
Materials selection
Molybdenum
Nickel
Nickel alloys
Nickel base alloys
Pitting (corrosion)
Precipitation hardening
Precipitation hardening steels
Stainless steel
Stainless steels
Steel structures
Stress corrosion
Stress corrosion cracking
Titanium alloys
Titanium base alloys
Uniform attack (corrosion)
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Summary:[Display omitted] •General corrosion, pitting and stress corrosion cracking characterization of a large number of stainless steel, nickel alloys and titanium alloys.•Material selection criteria for geothermal energy production.•Definition corrosion susceptibility maps for corrosion resistant alloys and titanium alloys. The paper is aimed to the evaluation of the corrosion behavior of corrosion resisting alloys (CRAs) in geothermal fluids operating at the dew point. Several test series were carried out in geothermal production sites of Tuscany (Italy) under continuous flow. The vapor was extracted directly from the main flow and it was conveyed in an experimental device designed to simulate dew point conditions. Nine martensitic stainless steel, one precipitation hardening stainless steel with martensitic structure, two ferritic extra low interstitial (ELI) stainless steels, four duplex (austenitic-ferritic) stainless steel, five austenitic stainless steels, six nickel alloys/super austenitic stainless steels, four titanium alloys were tested. The main forms of corrosion were general corrosion, localized corrosion (pitting and crevice) and stress corrosion cracking. Corrosion maps are presented as a function of PREN index, chromium, molybdenum and nickel content.
ISSN:0375-6505
1879-3576
DOI:10.1016/j.geothermics.2017.05.010