Abstract

The effect of Cu on the localized corrosion of Ni-Cr-Mo alloys has been investigated in hot saline solutions by comparing the behavior of alloys, Alloy 59 (UNSa N06059) and C-2000 (UNS N06200), using electrochemical and surface analytical techniques. Copper did not have any measurable effect on passive film properties or on either the breakdown and repassivation potentials or the protection temperature. Galvanostatically controlled crevice corrosion experiments clearly demonstrated that copper suppressed metastable breakdown events, precursor for stable pits. Dynamic secondary ion mass spectrometry (D-SIMS) showed copper accumulated in crevice corroded locations but could not confirm any influence of copper on crevice propagation.

Keywords:
metals & mining, production chemistry, flowline corrosion, oilfield chemistry, well integrity, h2s management, enrichment, pipeline corrosion, subsurface corrosion, corrosion management
Subjects:
Production Chemistry, Metallurgy and Biology, Pipelines, Flowlines and Risers, Materials and corrosion, Well Integrity, Subsurface corrosion (tubing, casing, completion equipment, conductor), Corrosion inhibition and management (including H2S and CO2)
This content is only available via PDF.
2015. NACE International
You can access this article if you purchase or spend a download.