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Type: Artigo
Title: Characterization of corrosion within friction stir weld zones of an API X-70 steel using a novel microcell setup
Author: da Cruz, Juliane Ribeiro
Bertazzoli, Rodnei
Abstract: The susceptibility of API-X70 friction stir weld zones to corrosion in a Na2SO4 acid medium is successfully investigated using an innovative microcell setup. Microstructures were characterized by optical and electron microscopy, Vickers microhardness mapping and linear potential scan voltammetry, at micro- and macroscales. Potential galvanic couples between the weld zones were identified. The most anodic zone was base metal, which, with a banded microstructure of ferrite and perlite, developed a potential difference of up to 45 mV in comparison with the adjacent heat-affected zone. Friction stir welding promoted solute redistribution and the formation of martensite/retained austenite constituent, which contributed to reduced galvanic corrosion between ferrite and cementite. The thermo-mechanically affected zone was the most cathodic region, composed of acicular ferrite, coarse bainite and martensite/retained austenite constituent. Polarization resistance progressively increased, and corrosion current density progressively decreased, from base metal toward stir zone. In addition to the reduction in galvanic corrosion, a more uniform distribution of corrosion products in the stir zone also accounted for this behavior
Subject: Soldadura por fricção
Country: Estados Unidos
Editor: Springer
Rights: Fechado
Identifier DOI: 10.1007/s11665-019-04531-z
Date Issue: 2020
Appears in Collections:FEM - Artigos e Outros Documentos

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