ATMOSPHERIC CORROSION OF FE-CU ALLOYS AND CU-CONTAINING STEELS

Studies have been made of the atmospheric corrosion of commercial Cu-containing steels and of pure Fe alloys containing Cu, S and Cu + S. Exposure tests in rural, marine and industrial environments have shown that the effect of cu is small in S-free alloys, but a marked decrease in the corrosion rate is observed when the alloy contains S. These results have been explained by assuming that the Cu dissolved from the alloy reacts with S2- and hS-, which are known to stimulate the corrosion of Fe, with the formation of insoluble Cu sulphides, Thus the deleterious action of the sulphide ions, which may be formed from sulphides in the alloy or from atmospheric pollutants, is nullified with a consequent decrease in the corrosion rate. Studies of rust structure indicate that differences in initial corrosion rates have a marked effect on the structure of the rust formed; a view that is in opposition to the usual concept of the formation of "protective rusts". The mechanism proposed, which has been developed from studies of pure Fe alloys, should be applicable to Cu-containing commercial steels, although the behaviour of these two types of alloys has shown certain differences. (A) /TRRL/

  • Availability:
  • Corporate Authors:

    Pergamon Press, Incorporated

    Maxwell House, Fairview Park
    Elmsford, NY  United States  10523
  • Authors:
    • Fyfe, D
    • Shanahan, CEA
    • Shreir, L L
  • Publication Date: 1970

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 817-830
  • Serial:
    • Corrosion Science
    • Volume: 10
    • Publisher: Pergamon Press, Incorporated
    • ISSN: 0010-938X

Subject/Index Terms

Filing Info

  • Accession Number: 00099724
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Nov 18 1975 12:00AM