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Titre du document / Document title

Corrosion Resistance and Galvanic Coupling of UNS N08031 Base Metal, Heat-Affected Zone, and Weld Metal in Phosphoric Acid at Different Temperatures

Auteur(s) / Author(s)

BLASCO-TAMARIT E. (1) ; GARCIA-GARCIA D. M. (1) ; FERRANDIZ M. Ibanez (1) ; GARCIA ANTON J. (1) ; GUENBOUR A. (2) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) Ingeniería Electroquimica y Corrosión (IEC), Departamento de Ingeniería Química y Nuclear, ETSI Industriales, Universidad Politécnica de Valencia, PO Box 22012, E-46071 Valencia, ESPAGNE
(2) Laboratory Corrosion-Electrochimie, Faculty of Sciences, University Mohammed V-Agdal, Rabat, MAROC

Résumé / Abstract

Open-circuit potential tests and potentiodynamic anodic polarization curves have been carried out to obtain information about the electrochemical behavior of a highly alloyed austenitic stainless steel (UNS N08031) used as base metal (BM), heat-affected zone (HAZ) region, and weld metal (WM). The weld was performed using the gas tungsten arc welding technique (GTAW) with a nickel-based alloy (UNS N06059) as filler metal. The galvanic corrosion generated by the electrical contact between the base metal, the HAZ, and the weld metal was estimated from the polarization diagrams according to the mixed potential theory. The objective of the present work was to study the effect of the solution temperature on the corrosion resistance of the studied materials. These materials were tested in 5.5 M phosphoric acid (H3PO4) solution at 25°C, 40°C, 60°C, and 80°C. Results demonstrated that materials passivated spontaneously in the studied solution and their corrosion resistance decreased with temperature.

Revue / Journal Title

Corrosion    ISSN  0010-9312   CODEN CORRAK 

Source / Source

2011, vol. 67, no3, [Note(s): 035001.1-035001.10] (47 ref.)

Langue / Language

Anglais

Editeur / Publisher

NACE International, Houston, TX, ETATS-UNIS  (1945) (Revue)

Mots-clés anglais / English Keywords

Passivity

;

Passivation

;

Anodic polarization

;

Temperature

;

Phosphoric acid

;

Weld metal

;

Welded joint

;

Heat affected zone

;

Welding

;

Galvanic coupling

;

Galvanic corrosion

;

Corrosion resistance

;

Mots-clés français / French Keywords

Passivité

;

Passivation

;

Polarisation anodique

;

Température

;

Acide phosphorique

;

Métal fondu soudage

;

Assemblage soudé

;

Zone thermiquement affectée

;

Soudage

;

Couplage galvanique

;

Corrosion effet pile

;

Résistance corrosion

;

Mots-clés espagnols / Spanish Keywords

Pasividad

;

Pasivación

;

Polarización anódica

;

Temperatura

;

Fosfórico ácido

;

Metal fundido soldeo

;

Ensamblaje soldado

;

Zona termoafectada

;

Soldadura

;

Acoplamiento galvánica

;

Corrosión galvánica

;

Resistencia corrosión

;

Mots-clés d'auteur / Author Keywords

anodic polarization

;

galvanic corrosion

;

passivity

;

steels

;

weld

;

Localisation / Location

INIST-CNRS, Cote INIST : 5595, 35400019372409.0010

Nº notice refdoc (ud4) : 23920069



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