Research on the corrosion behavior of double-side friction stir welded 6082Al alloy thick plate

Abstract In order to study the influences of microstructures on corrosion behavior of double-side friction stir welded 6082Al thick plate. The corrosion behavior was firstly clarified by potentiodynamic polarization and exfoliation corrosion (EXCO) tests. The microstructures before and after corrosion were identified by optical microscopy (OM), SEM and transmission electron microscope (TEM). The results showed that the corrosion resistance of heat-affected zone (HAZ) and base material (BM) was lower than those of thermo mechanically affected zone (TMAZ), top of NZ and middle of NZ. Bottom part of NZ was the most severe corroded zone. Intergranular corrosion along grain boundaries was the dominant corrosion type in BM, HAZ, TMAZ and bottom of NZ, while the top and middle part of NZ were susceptibility to pitting. The corrosion resistance decreased with the increase of weld pass. The precipitates mainly precipitated in NZ of the first pass and HAZ of both two passes during double side friction stir welding (FSW) due to the over aging process, which deteriorated the corrosion resistance.

[1]  A. Eyvazian,et al.  Friction-based welding processes: friction welding and friction stir welding , 2020 .

[2]  M. Gupta.  Effects of tool profile on mechanical properties of aluminium alloy Al 1120 friction stir welds , 2020 .

[3]  B. Liu,et al.  Macro-galvanic effect and its influence on corrosion behaviors of friction stir welding joint of 7050-T76 Al alloy , 2020 .

[4]  Zhenmin Wang,et al.  Direct joining of thermoplastic ABS to aluminium alloy 6061-T6 using friction lap welding , 2020, Science and Technology of Welding and Joining.

[5]  Zhimin Liang,et al.  Influence of FSW Repairing Process on the Microstructures and Mechanical Properties of Friction Stir-Welded 6082Al Alloy , 2019, Journal of Materials Engineering and Performance.

[6]  P. Li,et al.  Corrosion behavior and mechanical properties of Al-Zn-Mg aluminum alloy weld , 2017 .

[7]  R. Mishra,et al.  Effect of tool dimensions and parameters on the microstructure of friction stir welded aluminum 7449 alloy of various thicknesses , 2017 .

[8]  R. Yunus,et al.  Corrosion behavior of Al6061 alloy weldment produced by friction stir welding process , 2015 .

[9]  H. Fujii,et al.  Enhanced mechanical properties of 70/30 brass joint by multi-pass friction stir welding with rapid cooling , 2015 .

[10]  S. Dadbakhsh,et al.  Strengthening study on 6082 Al alloy after combination of aging treatment and ECAP process , 2010 .

[11]  S. Trasatti,et al.  Study of Al alloy corrosion in neutral NaCl by the pitting scan technique , 2010 .

[12]  J. Robson,et al.  Microstructural properties of friction stir welded and post-weld heat-treated 7449 aluminium alloy thick plate , 2008 .

[13]  Rajiv S. Mishra,et al.  Friction Stir Welding and Processing , 2007 .

[14]  A. Deschamps,et al.  Microstructure mapping in friction stir welds of 7449 aluminium alloy using SAXS , 2006 .

[15]  E. Evangelista,et al.  Influence of severe plastic deformations on secondary phase precipitation in a 6082 Al-Mg-Si alloy , 2005 .

[16]  Fabrizio Zucchi,et al.  Pitting and stress corrosion cracking resistance of friction stir welded AA 5083 , 2001 .

[17]  L. Murr,et al.  Corrosion of friction-stir welded aluminum alloys 2024 and 2195 , 2000 .

[18]  A. Mukherjee,et al.  High Strain Rate Superplasticity in a Friction Stir Processed 7075 Al Alloy , 1999 .

[19]  M. W. Mahoney,et al.  Properties of friction-stir-welded 7075 T651 aluminum , 1998 .

[20]  J. Svensson,et al.  Influence of Multi-Pass Friction Stir Processing on the Corrosion Behavior of an Al-Mg-Si Alloy , 2016 .

[21]  C. Hamilton,et al.  Influence of the tool shape and weld configuration on microstructure and mechanical properties of the Al 6082 alloy FSW joints , 2015 .

[22]  S. El-Raghy,et al.  Effect of aging time at low aging temperatures on the corrosion of aluminum alloy 6061 , 2012 .

[23]  Z. Ma,et al.  Effect of welding parameters on tensile properties and fracture behavior of friction stir welded Al-Mg-Si alloy , 2007 .

[24]  M. Szkodo,et al.  Analysis of FSW welds made of aluminium alloy AW6082-T6 , 2007 .