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  • AN INVESTIGATION OF THE SURFACE FILMS AND OF THE ELECTROCHEMICAL BEHAVIOUR OF CERTAIN NICKEL AND TITANIUM BASE ALLOYS IN SOLUTIONS WHICH ARE REPRESENTATIVE OF NATURAL WATERS FROM GRANITE, CLAY AND SALINE FORMATIONS.

Abstract

The corrosion behavior of the stainless steels 304, 316 Ti, 25Cr-20Ni-Mo-Ti, nickel base alloys Hastelloy C4, Inconel 625, Incoloy 800, Ti and Ti-0.2% Pd alloy has been studied in aerated or deaerated solutions at 20 degrees C and 90 degrees C. The electrochemical techniques used are voltammetry, polarization resistance and complex impedance measurements. Electrochemical data show the respective influence of the parameters on which depend the corrosion current density, the passivation current density and the pitting potential of alloys. Optical Glow Discharge Spectra show three parts in the composition depth profiles of surface films on alloys. XPS and SIMS spectrometry analyses are also carried out. Electron microscopy observation shows that passive films formed on Ti and Ti - Pd alloy have amorphous structure. Analysis of the alloy constituents dissolved in solutions, by radioactivation in neutrons, gives the order of magnitude of the Ni base alloy corrosion rates in various media. It also points out the preferential dissolution of alloying iron and in certain cases, of chromium.

Additional information

Authors: VU QUANG K, CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE;CENTRE D'ETUDES DE CHIMIE METALLURGIQUE, VITRY-SUR-SEINE (FRANCE);DA CUNHA BELO M, CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE;CENTRE D'ETUDES DE CHIMIE METALLURGIQUE, VITRY-SUR-SEINE (FRANCE);BENABED M S, CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE;CENTRE D'ETUDES DE CHIMIE METALLURGIQUE, VITRY-SUR-SEINE (FRANCE);BOURELIER N, CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE;CENTRE D'ETUDES DE CHIMIE METALLURGIQUE, VITRY-SUR-SEINE (FRANCE);JALLERAT N, CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE;CENTRE D'ETUDES DE CHIMIE METALLURGIQUE, VITRY-SUR-SEINE (FRANCE);PARI F L CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE, CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE;CENTRE D'ETUDES DE CHIMIE METALLURGIQUE, VITRY-SUR-SEINE (FRANCE);CENTRE D'ETUDES DE CHIMIE METALLURGIQUE, VITRY-SUR-SEINE (FRANCE), CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE;CENTRE D'ETUDES DE CHIMIE METALLURGIQUE, VITRY-SUR-SEINE (FRANCE)
Bibliographic Reference: EUR 9136 FR (1985) MF, 204 P., BFR 450, BLOW-UP COPY BFR 1020, EUROFFICE, LUXEMBOURG, POB 1003
Availability: Can be ordered online
Record Number: 1989123085800 / Last updated on: 1987-01-01
Category: PUBLICATION
Available languages: fr
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