ABSTRACT

ABSTRACT

The crevice corrosion resistance of nickel based alloys UNS N06625, N06022, N07022 and N10362 was tested in 5 mol/L CaCl2 solutions at temperatures ranging from 20 °C to 100 °C. The repassivation potential of each alloy linearly decreased with temperature. The crevice corrosion resistance of the alloys showed a good correlation with PREN (Pitting Resistance Equivalent Number). Crevice corrosion was observed at temperatures lower than the corresponding critical crevice temperature reported in the literature. Results were analyzed in terms of the localized acidification model for pitting and crevice corrosion. The possibility of finding a critical potential below which crevice corrosion does not occur at any temperature and chloride concentration is discussed. This may be a strong parameter for application in high-level nuclear waste repositories. The use of the results for industrial and long term applications is also discussed.

Keywords:
flowline corrosion, Subsurface Corrosion, metals & mining, riser corrosion, Pipeline Corrosion, well integrity, Publication Division, specimen, Houston, corrosion susceptibility
Subjects:
Pipelines, Flowlines and Risers, Materials and corrosion, Well Integrity, Subsurface corrosion (tubing, casing, completion equipment, conductor)
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2013. NACE International
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