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Simulation of Mild Steel Corrosion in H2S Aqueous Solution

Fallah Mohammadi, Ehsan | 2009

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  1. Type of Document: M.Sc. Thesis
  2. Language: English
  3. Document No: 39682 (57)
  4. University: Sharif University of Technology, International Campus, Kish Island
  5. Department: Science and Engineering
  6. Advisor(s): Dolati, Abolghasem
  7. Abstract:
  8. Corrosion is a main problem for oil and gas industries at refineries and petrochemical process. Presence of sulfur compounds in crude oil and creation a corrosive environment for steel structure, caused failure and unfortunate damages. H2S which present at cracking and sweetening process in sour feed obtain hydrogen atoms that can diffuse into steel structure which involve with its instruments and consequent to hydrogen damage .distribution and storage of these sour environments can be done by high strength low alloy steel (HSLA).Electrochemical hydrogen permeation test were performed to measure the hydrogen permeation current through A106/GR B pipeline steel in the electrolytes simulating the H2S condition and the critical hydrogen sulfide concentration for hydrogen induced cracking(HIC) is determined for ASTM A106/GR B grade line pipe steel which concluded in concentration of C2 between all simulating concentrations. A modified NACE standard for sour environment failures is used to evaluate the HIC resistivity of this alloy by measuring the permeability (jssL) and the apparent diffusivity (Dapp) .it is suggested that sulfide promote hydrogen adsorption and subsurface hydrogen concentration.

  9. Keywords:
  10. Low Alloy Steels ; Effective Diffusivity ; Plain Carbon Steel ; Aqueous Solutions ; Hydrogen Sulfide ; Hydrogen Induced Cracking

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