SEDL / STP / STP1438-EB / STP11162S

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

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

Pages: 8    Published: Jan 2003

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Source: STP1438-EB

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

Paper ID: STP11162S
Committee/Subcommittee: F04.95
DOI: 10.1520/STP11162S
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