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|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|
|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|
|Appears in Collections:||FEM - Artigos e Outros Documentos|
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