Global and local corrosion techniques were used to study the corrosion behaviour of weld joints of a high strength low alloy steel (LNE500), typically employed in the automotive industry, in Brazil. The welded joints were prepared by gas metal arc welding (GMAW). Two welding transfer modes were used in order to obtain different heat inputs (HI): pulsed (PUL) and cold metal transfer (CMT). Local and global corrosion analysis techniques presented complementary information. While the local in-situ analysis (scanning vibrating electrode technique) revealed the weld metal (WM) as the region where corrosion started, conventional electrochemical techniques (Potentiodynamic polarization (PP) and electrochemical impedance spectroscopy (EIS)) revealed a higher corrosion rate in the coarse-grained heat affected zone (CGHAZ), which was preferentially corroded. A superior corrosion resistance of the weld metal obtained using CMT over the PUL transfer mode was revealed by EIS and PP. In addition, the results from CMT and PUL samples show that austenite grain size affects the propagation of the corrosion process. The results are discussed based on microstructural and compositional aspects of the different regions that characterize the welded joints.
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Research Article|
February 21 2021
Global and local corrosion of welded joints of high-strength low-alloy automotive steel
Mainã Garcia
;
Mainã Garcia
M Garcia School of Mechanical, Materials, Mechatronic and Biomedical Engineering,
University of Wollongong
, Wollongong, Australia
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Juliana de Souza
;
Juliana de Souza
J de Souza Laboratório de Materiais e Manufatura Mecânica ,
Universidade Federal de São Paulo
, Diadema, Brazil
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Carol Glover
;
Carol Glover
C Glover Materials Science Engineering,
University of Virginia
, Charlottesville, 22901, United States
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Phil Ansell
;
Phil Ansell
P Ansell
Swansea University
, Swansea, United Kingdom of Great Britain and Northern Ireland
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Geraint Williams
;
Geraint Williams
G Williams College of Engineering,
Swansea University
, Swansea, SA1 8EN, United Kingdom of Great Britain and Northern Ireland
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Gerson Mantovani
;
Gerson Mantovani
G Mantovani CECS,
Universidade Federal do ABC
, Santo Andre, Brazil
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Vasant Kumar R
;
Vasant Kumar R
V R Department of Materials Science and Metallurgy,
Cambridge University
, Cambridge, United Kingdom of Great Britain and Northern Ireland
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Renato Antunes
R Antunes CECS,
UFABC
, Santo André, 09210-580, Brazil
Correspondence: Renato Antunes , Email: renato.antunes@ufabc.edu.br
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CORROSION 3718:.
Article history
Received:
October 21 2020
Revision Received:
February 05 2021
Accepted:
February 21 2021
Citation
Mainã Garcia, Juliana de Souza, Carol Glover, Phil Ansell, Geraint Williams, Gerson Mantovani, Vasant Kumar R, Renato Antunes; Global and local corrosion of welded joints of high-strength low-alloy automotive steel. CORROSION 2021; 3718:. doi: https://doi.org/10.5006/3718
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Global and local corrosion of welded joints of high-strength low-alloy automotive steel
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