Corrosivity of geothermal brines. Progress report for period ending September 1977. Final report

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Results of studies carried out principally during FY 1976 and FY 1977 on the corrosion of ferrous materials in synthetic geothermal brines are summarized. A survey of prior work on electrochemical aspects of the corrosion of iron and carbon steel in chloride solutions is presented, and some of the results of these investigations are summarized. The principal results of the present studies are then recapitulated. Included are measurements of the corrosion potential, corrosion rate, and polarization behavior of iron and carbon steel in deaerated 4 M NaCl over the pH range from 1 to 11 at temperatures up to 100/sup ... continued below

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Pages: 53

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Posey, F.A.; Palko, A.A. & Bacarella, A.L. March 1, 1978.

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Results of studies carried out principally during FY 1976 and FY 1977 on the corrosion of ferrous materials in synthetic geothermal brines are summarized. A survey of prior work on electrochemical aspects of the corrosion of iron and carbon steel in chloride solutions is presented, and some of the results of these investigations are summarized. The principal results of the present studies are then recapitulated. Included are measurements of the corrosion potential, corrosion rate, and polarization behavior of iron and carbon steel in deaerated 4 M NaCl over the pH range from 1 to 11 at temperatures up to 100/sup 0/C in a conventional Pyrex electrochemical cell. The effect of pH on hydrolysis, precipitation, and electrochemical reactivity of ferrous and ferric ions in 4 M NaCl at 25/sup 0/C is presented, and implications for plant operation are discussed. Details of a refreshed, stirred titanium autoclave system are described; the system permits electrochemical measurements to be made up to at least 200/sup 0/in corrosive aqueous saline media. The effect of pH (from pH equals 7 to pH equals 2) and temperature (from 25/sup 0/ to 200/sup 0/C) on the corrosion rate of type A212B carbon steel in deaerated 4 M NaCl is described. A relatively simple numerical correlation describes the data over the entire temperature and pH range. The spontaneous corrosion potentials and pitting potentials of types 304 and 316 stainless steel were measured in deaerated 4 M NaCl at pH equals 5 from 25/sup 0/ to 200/sup 0/C, and the data demonstrate the borderline stability of austenitic stainless steel for brine service. Finally, conclusions and recommendations for further studies are presented.

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Pages: 53

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Dep. NTIS, PC A04/MF A01.

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  • Report No.: ORNL/TM-6308
  • Grant Number: W-7405-ENG-26
  • DOI: 10.2172/5101733 | External Link
  • Office of Scientific & Technical Information Report Number: 5101733
  • Archival Resource Key: ark:/67531/metadc1055037

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Office of Scientific & Technical Information Technical Reports

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Creation Date

  • March 1, 1978

Added to The UNT Digital Library

  • Jan. 22, 2018, 7:23 a.m.

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  • Feb. 1, 2018, 6:05 p.m.

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Posey, F.A.; Palko, A.A. & Bacarella, A.L. Corrosivity of geothermal brines. Progress report for period ending September 1977. Final report, report, March 1, 1978; Tennessee. (digital.library.unt.edu/ark:/67531/metadc1055037/: accessed May 25, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.