STP1438

    Comparative Electrochemical Studies of F 1586-95 and F 138-92 Stainless Steels in Sodium Chloride, pH = 4.0 Medium

    Published: Jan 2003


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    Abstract

    In this work, ASTM F 1586-95 stainless steel used for surgical implants is studied in 0.9 % NaCl aqueous solution, pH = 4.0 at 40 °C, using potentiodynamic polarization curves and optical surface analysis techniques and its performance is compared to F 138 stainless steel. F 1586-95 remains passivated until transpassivation potential above, which shows only generalized corrosion. F 138-92 presents breakdown potentials of 370 mV / SCE, with the presence of pitting corrosion. The presence of 0.40 % Nb in F 1586-95 promotes passivation currents one order of magnitude higher than that observed for F 1586-95 containing 0.28 % Nb.

    Keywords:

    breakdown potentials, austenitic stainless steel, ASTM F 1586-95, ASTM F 138-92, orthopedic implants


    Author Information:

    Villamil, RFV
    Postdoctoral Student, Institute de Química, Universidade de São Paulo, São Paulo, SP

    de Andrade, AHP
    Research Scientist, Instituto de Pesquisas Energéticas e Nucleares (IPEN) Trav. R 400 — Cidade Universitária, S.P,

    Barbosa, CA
    Manager and Research Engineer, Villares Metals S. A., Sumaré, SP

    Sokolowski, A
    Manager and Research Engineer, Villares Metals S. A., Sumaré, SP

    Agostinho, SML
    Professor, Instituto de Química, Universidade de São Paulo, Säo Paulo, SP


    Paper ID: STP11162S

    Committee/Subcommittee: F04.95

    DOI: 10.1520/STP11162S


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