Abstract
Corrosion properties of dissimilar friction stir welded 6061 aluminum and HT590 steel were investigated to understand effects of galvanic corrosion. As cathode when coupled, HT590 was cathodically protected. However, the passivation of AA6061 made the aluminum alloy cathode temporarily, which leaded to corrosion of HT590. From the EIS analysis showing Warburg diffusion plot in Nyquist plots, it can be inferred that the stable passivation layer was formed on AA6061. However, the weld as well as HT590 did not show Warburg diffusion plot in Nyquist plots, suggesting that there was no barrier for corrosion or even if it exists, the barrier had no function for preventing and/or retarding charge transport through the passivation layer. The open circuit potential measurements showed that the potential of the weld was similar to that of HT590, which lied in the pitting region for AA6061, making the aluminum alloy part of the weld keep corrosion state. That resulted in the cracked oxide film on AA6061 of the weld, which could not play a role of corrosion barrier.
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This research has been conducted with the support of the Korea Institute of Industrial Technology (KITECH JG-18-0001).
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Seo, B., Song, K.H. & Park, K. Corrosion Properties of Dissimilar Friction Stir Welded 6061 Aluminum and HT590 Steel. Met. Mater. Int. 24, 1232–1240 (2018). https://doi.org/10.1007/s12540-018-0135-2
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DOI: https://doi.org/10.1007/s12540-018-0135-2