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Journal ArticleDOI

Effect of SAW fluxes on electrochemical corrosion & microstructural behavior of API X70 weldments:

15 Feb 2021-Vol. 235, Iss: 4, pp 1140-1149
TL;DR: Submerged arc welding finds its application to weld thick pipes as mentioned in this paper, and high performance pipeline steels are frequently used for storage, transportation and energy development applications, such as nuclear power plants.
Abstract: High-performance pipeline steels are frequently used for storage, transportation and energy development applications. Submerged arc welding finds its application to weld thick pipes. Design and dev...
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Journal ArticleDOI
TL;DR: The electrochemical behavior of SAE-1020 carbon steel in 0.25-M Na2SO4 solution containing different concentrations of H2S at 90°C was investigated using the methods of weight loss, electrochemical measurements, scanning electron microscopy (SEM) and X-ray diffraction (XRD) as discussed by the authors.

140 citations

Journal ArticleDOI
TL;DR: In this paper, the performance of E690 steel in the aerated, deaerated, acidified, and thiosulfate-containing artificial seawater was investigated, and the results showed that at high thio-sulfate concentration, severe pitting corrosion leads to the highest SCC susceptibility despite that the formation of continuous mackinawite inhibits hydrogen permeation.

119 citations

Journal ArticleDOI
TL;DR: In this article, the authors investigated the hydrogen embrittlement of E690 steel in thiosulfate-containing artificial seawater (ASW) under cathodic polarization, and the maximum permeation current was achieved at −850mVSCE due to the change of interfacial pH and promotion ability of sulfur species.

83 citations


"Effect of SAW fluxes on electrochem..." refers background in this paper

  • ...It was noticed that, the precipitation of aragonite was restricted due to the stringent cathodic reactions that do not produce hydroxyl ions, sufficient absorption of hydrogen sulphide ions which expel hydroxyl and carbonate ions and enhanced hydrogen evolution that impedes aragonite nucleation.(17) Available literature reveals that presence of hydrogen sulphide in the medium accelerates both anodic as well as cathodic reactions....

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Journal ArticleDOI
TL;DR: In this article, the influence of pH and the concentration of hydrogen sulfide (H2S) on corrosion of iron in acid solutions was studied using a potentiostatic polarization method.
Abstract: The influence of pH and the concentration of hydrogen sulfide (H2S) on corrosion of iron in acid solutions was studied using a potentiostatic polarization method. The alternating current (AC) impedance technique also was used to characterize the active dissolution process of iron. Results showed the dissolution process was accelerated by H2S. The anodic dissolution current (ia) increased with pH and H2S concentration with reaction orders of about npH = nH2S = 0.25 when the ratio of H2S concentration and hydrogen ion (H3O+) concentration was 101.5. The Nyquist diagram corresponding to the active dissolution process in the Tafel range exhibited two capacitive loops in addition to the well-known, high-frequency capacitive loop. A mechanism was proposed to explain the results in which H2S chemisorbed first on the electrode surface and then catalyzed the anodic dissolution of iron in two discharging steps.

68 citations

Journal ArticleDOI
TL;DR: In this article, the influence of titanium on API 5L-X70 steel weld metal properties at manganese levels of 1.4 and 2.08% was studied and the best mechanical properties in the weld series were obtained in two compositions.

59 citations