Simultaneous Effect of Welding Current with PostWeld T6 Heat Treatment on Corrosion Susceptibility of Al6013 Alloy Joined by GTAW

Authors : Mehmet TOPUZ

Pages : 269-277

Doi:10.17350/HJSE19030000316

View : 80 | Download : 47

Publication Date : 2023-09-30

Article Type : Research Paper

Abstract :Al6013 base metals were joined successfully with ER4047 weld metal by using the GTAW method under different welding currents. Post-weld T6 heat treatment effects on corrosion properties were investigated in terms of open circuit potential insert ignore into journalissuearticles values(OCP);, potentiodynamic polarization insert ignore into journalissuearticles values(PDS);, and electrochemical impedance spectroscopy insert ignore into journalissuearticles values(EIS); tests. It was determined that corrosion resistance of the post-weld samples increased with increasing welding current, while T6 heat-treatment only effective on 110A and 140A welding current samples insert ignore into journalissuearticles values(3.61 to 2.08, 2.95 to 2.40, and 1.38 to 2.15 µA·cm-2 for 110, 140, and 170A welding current before and after T6 heat-treatment);. The characteristics of the oxide films on the surfaces are revealed with EIS analysis by a two-constant equivalent circuit model which observed that while the passive film originating from Al is formed on the surfaces, on the other hand, it contains a pittings on the surface. It was determined that the pitting resistance of the T6 heat-treated 110A samples increased insert ignore into journalissuearticles values(3075 to 4562 Ω);. Post-corrosion SEM surface morphologies showed that low welding currents lead to more damage with increased exposure to corrosion.
Keywords : Al6013, GTAW, Weld current, T6 heat treatment, Corrosion