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Corrosion Engineering, Science and Technology
The International Journal of Corrosion Processes and Corrosion Control
Volume 58, 2023 - Issue 2
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Research Articles

Quantitative analysis of susceptibility to intergranular corrosion in alloy 625 joined by friction stir welding

E. B. Fonsecaa Department of Mechanical Engineering, University of Campinas – UNICAMP, Campinas, BrazilORCID Iconhttps://orcid.org/0000-0002-6437-6125View further author information
ORCID Icon,
A. Z. Fatichia Department of Mechanical Engineering, University of Campinas – UNICAMP, Campinas, BrazilORCID Iconhttps://orcid.org/0000-0003-2235-3774View further author information
ORCID Icon,
M. Teradab SENAI Institute of Innovation for Advanced Manufacturing and Microfabrication, São Paulo, BrazilCorrespondence[email protected]
ORCID Iconhttps://orcid.org/0000-0002-2011-5759View further author information
ORCID Icon,
A. F. S. Bugarinb SENAI Institute of Innovation for Advanced Manufacturing and Microfabrication, São Paulo, Brazil;c IPEN/CNEN-SP, São Paulo, BrazilORCID Iconhttps://orcid.org/0000-0002-0386-8142View further author information
ORCID Icon,
J. Rodriguezd Department of Engineering and Basic Science, Universidad EIA, Antioquia, ColombiaORCID Iconhttps://orcid.org/0000-0003-3219-6290View further author information
ORCID Icon,
Isolda Costac IPEN/CNEN-SP, São Paulo, BrazilORCID Iconhttps://orcid.org/0000-0002-4987-3334View further author information
ORCID Icon &
A. J. Ramireze Department of Materials Science and Engineering, The Ohio State University, Columbus, OH, USAORCID Iconhttps://orcid.org/0000-0002-4252-2857View further author information
ORCID Icon show all
Pages 138-144 | Received 03 Aug 2022, Accepted 17 Nov 2022, Published online: 02 Dec 2022
 
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ABSTRACT

Alloy 625 is a Ni-based alloy used in aerospace, energy, chemical, oil and gas industries, mainly as cladding material due to its corrosion resistance, high strength and creep resistance at high temperature. In this study, microstructural evaluation and susceptibility to intergranular corrosion of base metal and friction stir welded Alloy 625 were investigated. Friction stir welded joints exhibited a lower corrosion rate and degree of sensitisation compared to the base metal. It is mainly due to grain refinement and lower cooling rate of the friction stir welding process. The stir zone of the present weld has a finer grain structure and lower density of twin boundaries than the base metal and it led to the improvement of the mechanical and corrosion properties.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

The authors gratefully acknowledge Petrobras (Contract Number0050.0050438.09.9) for financial support, the Brazilian NanotechnologyNational Laboratory (LNNano-CNPEM) and University of Campinas for technical support.

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