Corrosion Behavior on Titanium Alloys as OCTG in Oil Fields

Abstract:

Titanium alloys have been taken as Oil Country Tubular Goods (OCTG) owing to their higher strength, and better corrosion resistance, but there are some problems in their application process. The corrosion types of titanium alloys were emphatically discussed, and corrosion mechanism was analyzed in this paper. The results showed that the main corrosion type of titanium alloys in hydrochloric acid was pitting, and the surface roughness of titanium alloys could affect it. The critical current density of titanium alloys in phosphoric acid was closely related to temperature and phosphoric acid concentration. The passivation of titanium alloys could be carried out by the growing oxide film at low current density, to achieve the higher stability of passivating film in the concentrated sulfuric acid. Titanium alloys suffered from more serious corrosion in the CO₂-containing completion fluid environment than that in the CO₂-containing formation water environment. H₂S would cause electrochemical corrosion and stress corrosion of titanium alloy pipe, leading to hydrogen embrittlement and even cracking of OCTG. Passivating film was the key to corrosion resistance of titanium alloys, and its composition would change with the depth of the film, presenting N-type. The dynamic corrosion of titanium alloys was mainly controlled by charge transfer.

• Periodical: Materials Science Forum (Volume 1032)
• Pages: 195-200
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.1032.195
• Online since: May 2021
• Authors: Xin Yu Wang, Shi Dong Zhu*, Qiang Liu, An Qing Fu, Jin Ling Li
• Keywords: Corrosion Mechanism, Corrosion Type, Oil Country Tubular Goods, TC4, Titanium Alloy

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