The corrosion of carbon steel by wet elemental sulphur

Macdonald, Digby D.; Roberts, Bruce; Hyne, J. B.

doi:10.1016/s0010-938x(78)80037-7

Cited by 70 publications

(44 citation statements)

References 11 publications

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“…The 280FS AA is external computercontrolled atomic absorption spectrometers supporting multi element flame AA determinations using Fast Sequential analysis for improved sample throughput with flame AA. The supplies of fuel (acetylene) and oxidant shall be maintained at pressures somewhat higher than the controlled operating pressure of the instrument by suitable valves [17,18].…”

Section: Atomic Absorption Spectroscopy Techniquementioning

confidence: 99%

Study the Mettalic Finishing and Corrosion Control Processes for Carbon Steel over Head Pipes Using Polymer Molecules

El-Shamy¹

2017

MOJBOC

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Carbon steel has wide applications in industry (especially in petroleum industry, e.g. pipelines out from the top of distillation towers (over head pipes), pressure vessels, nozzles etc.) and domestic life. Study the phenomenon of electropolishing which is important as metallic finishing process which takes place before electroplating of metal. This work is devoted to study the electropolishing of carbon steel in phosphoric acid in presence of polymers molecules (Starch, Gelatin, Agar, Chitosan, Arabic gum, Cellulose acetate, Cellulose and Carboxymethyl cellulose sodium salt). The rate of electropolishing of carbon steel in phosphoric acid solution in case of applied various affecting factors was investigated by estimated polarization curves from values of current and voltage that were obtained from the electrochemical cell. Morphology of the specimens after the experiment is monitored using scanning electron microscope (SEM). The (SEM) micrographs support the experimental measurements and give more light on carbon steel surface. Finally, samples of industrial waste water are collected from a drain of vacuum distillation tower over head pipes in Alexandria petroleum company and ferrous ions Fe +2 concentrations are determined in case of presence and absence of polymers molecules in order to judge the role of these polymers as a corrosion inhibitors on the ability to control the corrosion on carbon steel over head pipes. Keywords:

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Section: Atomic Absorption Spectroscopy Techniquementioning

confidence: 99%

Study the Mettalic Finishing and Corrosion Control Processes for Carbon Steel over Head Pipes Using Polymer Molecules

El-Shamy¹

2017

MOJBOC

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“…The 280FS AA is external computer-controlled atomic absorption spectrometers supporting multielement flame AA determinations using Fast Sequential analysis for improved sample throughput with flame AA. The supplies of fuel (acetylene) and oxidant shall be maintained at pressures somewhat higher than the controlled operating pressure of the instrument by suitable valves [17,18]..…”

Section: Atomic Absorption Spectroscopy Techniquementioning

confidence: 99%

“…Leveling is the principle process in electro-polishing [17] and can be explained by mass transfer mechanism [18]. The study of leveling is based on the classical current voltage curves of electro dissolution.…”

Section: Leveling Processmentioning

confidence: 99%

Study the Mettalic Finishing and Corrosion Control Processes for Carbon Steel over Head Pipes Using Polymer Molecules

El-Shamy¹,

Aggour²,

Ahmed³

2017

International Journal of Advanced Research in Chemical Science

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“…(2) The presence of S caused a significant and reproducible negative potential offset to the alloy (separate from the effects of ion implantation) and the effect appears to be related to the amount of S present. (3) There is strong evidence that S can enrich on the surface of Alloy 22 during corrosion under normally passive conditions in deaerated solutions. The above results suggest that, although the short-term effects of S at 2 at.% or lower are minimal for Alloy 22 corrosion in deaerated 1 M NaCI, long-term exposure (I00 years) of the alloy with bulk impurity concentrations as low as 10 ppm has the potential of raising surface-S concentrations higher than tested in this work and thereby influencing the corrosion process.…”

Section: Executive Summarymentioning

confidence: 99%

Final Report for the Study on S-Implanted Alloy 22 in 1 M Naci Solutions

n¹

2005

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The objective of this study was to examine the effects of high levels of S in the nearsurface region on the passivity of Alloy 22, a corrosion resistant Ni-Cr-Mo alloy, in deaerated 1 M NaCl solution. Near-surface concentrations of S up to 2 at.% were achieved in Alloy 22 test specimens by implanting them with S. The S-implanted samples were then evaluated in short-term electrochemical tests in the salt solution and subsequently analyzed with X-ray Photoelectron Spectroscopy (XPS) for film thickness and composition. Specimens tested included non-implanted and annealed Alloy 22 samples, samples implanted with S, and "blanks" implanted with Ar as an ion that would simulate the "damage" of S implantation without the chemical effect. A sample of Simplanted Alloy 22 was also exposed to solution for 29 days and analyzed for evidence of S accumulation at the surface over longer times.Three primary findings resulted from this work: (1) There was very little, if any, reproducible influence from the S on the corrosion current in the short term when present in the surface layers of the alloy at concentrations up to 2 at.%. One experiment on a sample containing S exhibited a minor irregular current excursion in the polarization that suggested a localized corrosion process, but the event could not be corroborated using other methods. (2) The presence of S caused a significant and reproducible negative potential offset to the alloy (separate from the effects of ion implantation) and the effect appears to be related to the amount of S present. (3) There is strong evidence that S can enrich on the surface of Alloy 22 during corrosion under normally passive conditions in deaerated solutions. The above results suggest that, although the short-term effects of S at 2 at.% or lower are minimal for Alloy 22 corrosion in deaerated 1 M NaCI, long-term exposure (I00 years) of the alloy with bulk impurity concentrations as low as 10 ppm has the potential of raising surface-S concentrations higher than tested in this work and thereby influencing the corrosion process. This conclusion is based upon our observations that S appears to accumulate on the surface under all the conditions tested in this work and that there is a systematic shift in the open-circuit potential that depends on the amount of S. Studies on the impact of this buildup will require samples with even higher levels of surface-S than were tested in this work and should be the subject of additional study. It should also be noted that the role of dissolved oxygen on surface-S buildup needs to be studied in future work as well. In aerated environments, it is possible that the S may be significantly oxidized and removed (by dissolution) from the surface, thus ameliorating the long-term effects of the S-sulfur on corrosion.iii Acknowledgment

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The corrosion of carbon steel by wet elemental sulphur

Cited by 70 publications

References 11 publications

Study the Mettalic Finishing and Corrosion Control Processes for Carbon Steel over Head Pipes Using Polymer Molecules

Study the Mettalic Finishing and Corrosion Control Processes for Carbon Steel over Head Pipes Using Polymer Molecules

Study the Mettalic Finishing and Corrosion Control Processes for Carbon Steel over Head Pipes Using Polymer Molecules

Final Report for the Study on S-Implanted Alloy 22 in 1 M Naci Solutions

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