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Corrosion Properties of Dissimilar AA6082/AA6060 Friction Stir Welded Butt Joints in Different NaCl Concentrations

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Abstract

A solid-state friction stir welding method which is increasingly used in the marine and shipbuilding industry, has been developed to produce welds with high mechanical properties. In seawater, the oxide layer of aluminium is attacked by Cl− ions resulting in its disruption and formation of pitting corrosion. It is particularly important to determine the electrochemical properties of the produced welds and to evaluate the effect of welding parameters on these properties. The following paper presents a study on the corrosion properties of welds of dissimilar aluminium alloys, AA6082 and AA6060, produced for two different tool traverse speeds of 160 and 200 mm/min, with consideration of the size of crystallites and residual stresses in the samples, determined by Williamson-Hall analysis and micro-indentation tests. The results revealed that the size of the crystallites in the welds was larger compared to the base materials and the friction stir welding process generated residual compressive stresses. Furthermore, the welds exhibited higher corrosion resistance compared to the parent materials. Scanning electron microscope observations indicated that the preferred locations of corrosion propagation for welds are the edges on the joint line formed by the combination of rotational and linear motion of the tool.

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Acknowledgements

The authors would like to thank Maria Gazda from Faculty of Applied Physics and Mathematics of Gdańsk University of Technology for performing XRD tests.

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  1. Faculty of Mechanical Engineering and Ship Technology, Gdansk University of Technology, Narutowicza, 11/12, 80-233, Gdansk, Poland

    Aleksandra Laska, Marek Szkodo, Łukasz Pawłowski & Grzegorz Gajowiec

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Laska, A., Szkodo, M., Pawłowski, Ł. et al. Corrosion Properties of Dissimilar AA6082/AA6060 Friction Stir Welded Butt Joints in Different NaCl Concentrations. Int. J. of Precis. Eng. and Manuf.-Green Tech. 10, 457–477 (2023). https://doi.org/10.1007/s40684-022-00441-z

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