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Characterization of Corrosion Within Friction Stir Weld Zones of an API X-70 Steel Using a Novel Microcell Setup

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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.

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Acknowledgments

The authors would like to thank Dr. Getúlio de Vasconcelos and MSc. Renê Volu, from Dedalo Laboratory at the Institute for Advanced Studies (IEAv), for their support with laser processing; CAPES, for graduation scholarship; and FAPESP, for research funding (Proc. 2016/10637-4).

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  1. Graduation Program in Aeronautical and Mechanical Engineering, Aeronautics Institute of Technology (ITA), São José dos Campos, São Paulo, 12228-900, Brazil

    Juliane Ribeiro da Cruz

  2. Faculty of Mechanical Engineering, State University of Campinas, Campinas, São Paulo, 13083-860, Brazil

    Rodnei Bertazzoli

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Correspondence to Juliane Ribeiro da Cruz.

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da Cruz, J.R., Bertazzoli, R. Characterization of Corrosion Within Friction Stir Weld Zones of an API X-70 Steel Using a Novel Microcell Setup. J. of Materi Eng and Perform 29, 98–108 (2020). https://doi.org/10.1007/s11665-019-04531-z

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  • DOI: https://doi.org/10.1007/s11665-019-04531-z

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