Effect of rotational speed and tool pin profile on the corrosion rate of friction stir welded AA6061-T3

In this study, the corrosion behaviour of friction stir welding (FSW) of AA6061-T3 alloy was investigated. The FSW was performed under two different rotation speed (850 and 950 rpm) and constant travelling speed (22 mm/min). Two tool pin profiles (straight cylindrical and conical types) were utilised to study their impact on corrosion resistance. The corrosion behaviour of the base metal (BM) and weld zone were studied by Tafel polarisation cell using 3.5wt.% NaCl and 3.5wt.% KCl solutions at ambient temperature. The results showed that the welded alloy exhibits lower corrosion resistance than the BM. Lower rotational speed (850 rpm) produced weld with higher corrosion resistance in both NaCl and KCl media. Conical tool pin profile produced weld with corrosion resistance higher than the straight cylinder pin in both NaCl and KCl media. NaCl recorded higher corrosion rate with almost twice of the KCl for all welding conditions.

[1]  I. Şimşek.  Investigation of the effect of second phase precipitates on the corrosion and electrical conductivity of 7075 aluminum alloys , 2019, Anti-Corrosion Methods and Materials.

[2]  A. Astarita,et al.  Dissimilar friction stir lap welding of AA 6082 - Mg AZ31: Force analysis and microstructure evolution , 2019, Journal of Manufacturing Processes.

[3]  Abou Bakr Elshalakany,et al.  Influence of friction stir welding parameters on metallurgical and mechanical properties of dissimilar AA5454–AA7075 aluminum alloys , 2019, Journal of Materials Research and Technology.

[4]  Surjya K. Pal,et al.  Interfacial Microstructural and Corrosion Characterizations of Friction Stir Welded AA6061-T6 and AISI304 Materials , 2018, Metals and Materials International.

[5]  K. Sun,et al.  Intermetallic Phases in Aluminum Alloys and Their Roles in Localized Corrosion , 2018 .

[6]  D. K. Dwivedi,et al.  A study on corrosion behavior of friction stir welded and tungsten inert gas welded AA2014 aluminium alloy , 2018 .

[7]  J. Svensson,et al.  Corrosion behaviour of friction stir-welded AA6005-T6 using a bobbin tool , 2016 .

[8]  G. Rambabu,et al.  Optimization of friction stir welding parameters for improved corrosion resistance of AA2219 aluminum alloy joints , 2015 .

[9]  Shengxi Li,et al.  Microstructure, mechanical properties and corrosion of friction stir welded 6061 Aluminum Alloy , 2015, 1511.05507.

[10]  K. S. Rao,et al.  Microstructure and pitting corrosion resistance of AA2219 Al–Cu alloy friction stir welds – Effect of tool profile , 2015 .

[11]  R. Yunus,et al.  Corrosion behavior of friction stir welded lap joints of AA6061-T6 aluminum alloy , 2014 .

[12]  S. Ciliberto,et al.  On the critical technological issues of friction stir welding lap joints of dissimilar aluminum alloys , 2013 .

[13]  M. Almomani,et al.  Effect of process parameters on corrosion rate of friction stir welded aluminium SiC–Gr hybrid composites , 2013 .

[14]  S. K. Sadrnezhaad,et al.  Corrosion behavior of aluminum 6061 alloy joined by friction stir welding and gas tungsten arc welding methods , 2012 .