ABSTRACT

The impact of production parameters (end rolling temperature and cooling rate) on microstructure and corrosion properties of UNS 06625 used as a cladding material in oil and gas industry, was investigated. In addition, the effect of different annealing treatments was determined. Susceptibility to intergranular corrosion was investigated by means of a conventional immersion test according to ASTM G28A and the Double Loop – Electrochemical potentiostatic Reactivation Test (DL-EPR method). Scanning electron microscopy (SEM) was used to evaluate microstructure and the type of corrosive attack prior and after testing. Precipitation of various phases adjacent grain boundaries was found. Chemical composition of phases was characterized by SEM and Transmission electron microscopy (TEM), as well as with Scanning auger electron electroscopy (SAES). The results of high-resolution investigations were compared to those of corrosion measurements and are critically discussed. In conclusion, the most promising production parameters of thermo mechanically rolled UNS 06625 are described.

Keywords:
Pipeline Corrosion, well integrity, auger electron spectroscopy, flowline corrosion, Subsurface Corrosion, Publication Division, materials and corrosion, precipitation, precipitate, annealed condition
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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