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This study investigates the behaviour of the API X80 steel in relation to hydrogen absorption in solutions with different concentrations of H2S, at static and tensile test conditions.
With the growing application of high strength steel, as API 5L X80, for pipelines in the oil industry, and related geothermal energy generation plants, comes the concern about the risks involving hydrogen diffusion and hence, embrittlement due to severe operational conditions and corrosive environment containing hydrogen sulphide (H2S). Although many efforts have been made to predict and understand those phenomena, the mechanisms involving H2S corrosion combined with applied strain are still not entirely understood. In addition, the growth of iron sulphides scales can influence on the diffusion process. This study investigates the behaviour of the API X80 steel in relation to hydrogen absorption in solutions with different concentrations of H2S, at static and tensile test conditions. It aims to evaluate hydrogen embrittlement susceptibility of the steel by means of hydrogen permeation and slow strain rate tests. Furthermore, the present work seeks out to evaluate, particularly in this embrittlement process, the conditions of iron sulphide layer forming and stability in different solutions of sodium thiosulphate, as well as the film influence as a protective barrier to hydrogen entry. Investigations using electrochemical impedance spectroscopy and surface analysis by SEM, EDS and XRD indicated that exists a relationship between different concentrations of H2S, scale formation and its barrier protectiveness to hydrogen generation and uptake.
Key words: Sour corrosion, iron sulphide, scale, hydrogen embrittlement, SSRT, electrochemistry
An experiment to simulate bare field joint configuration under cathodic protection over a long term exposure in seawater on a 3LPE coated pipe section in renewed seawater and half-buried in mud. Results conclude that the bare field joint concept is feasible.
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This paper attempts to compare the critical pitting temperature (CPT) for alloys when ASTM G150 is not applicable. By using MgCl2 as electrolyte, the boiling point is increased and the measuring zone for CPT is broader.
The model was evaluated and effects of various parameters on corrosion rates are described. Corrosion rates obtained from the model are compared with actual field and lab testing data as a basis to quantify accuracy and efficacy.