High-strength age-hardenable aluminium alloys are susceptible to localised corrosion. It is vital to monitor the evolution of the corrosion depth in order to prevent a critical degradation of the mechanical properties. This study presents the application of 3D optical pattern profilometry for the analysis of the pitting corrosion behaviour of the aluminium alloy EN AW-2024-T3. Therefore, measurements were conducted using a 1 M NaCl solution at different exposure times. The measurements are compared to the results of optical microscopy investigations of metallographic specimens as well as laser scanning microscopy measurements. In immersion bath tests, the 3D pattern profilometry shows a high measurement accuracy of the pitting corrosion. Regarding the pit characteristics, corroded metal sheets exhibit an increase in the pit depth, volume and area with an increasing exposure time of up to 312 h and then decrease. Moreover, a higher increase in the width in rolling direction than perpendicular to it is noticeable.
BirbilisNBuchheitRG.Electrochemical characteristics of intermetallic phases in aluminum alloys - an experimental survey and discussion. J Electrochem Soc. 2005; 152 (4): B140–B151. doi: 10.1149/1.1869984
2.
PantelakisSGDaglarasPGApostolopoulosCA.Tensile and energy density properties of 2024, 6013, 8090 and 2091 aircraft aluminum alloy after corrosion exposure. Theor Appl Fract Mec. 2000; 33 (2): 117–134. doi: 10.1016/S0167-8442(00)00007-0
3.
PantelakisSSetsikaDChamosA, et al. Corrosion damage evolution of the aircraft aluminum alloy 2024 T3. Int J Integt. 2016; 7 (1): 25–46.
4.
PantelakisSGChamosANKermanidisAT.A critical consideration for the use of al-cladding for protecting aircraft aluminum alloy 2024 against corrosion. Theor Appl Fract Mec. 2012; 57 (1): 36–42. doi: 10.1016/j.tafmec.2011.12.006
5.
PidapartiRMPatelRK.Investigation of a single pit/defect evolution during the corrosion process. Corros Sci. 2010; 52 (9): 3150–3153. doi: 10.1016/j.corsci.2010.05.029
6.
PidapartiRMPatelRR.Modeling the evolution of stresses induced by corrosion damage in metals. J Mater Eng Perform. 2011; 20 (7): 1114–1120. doi: 10.1007/s11665-010-9753-7
7.
JonesKHoeppnerDW.Prior corrosion and fatigue of 2024-T3 aluminum alloy. Corros Sci. 2006; 48 (10): 3109–3122. doi: 10.1016/j.corsci.2005.11.008
8.
van der WaldeKHillberryBM.Characterization of pitting damage and prediction of remaining fatigue life. Int J Fatigue. 2008; 30 (1): 106–118. doi: 10.1016/j.ijfatigue.2007.02.020
9.
AlexopoulosNDPapanikosP.Experimental and theoretical studies of corrosion-induced mechanical properties degradation of aircraft 2024 aluminum alloy. Mater Sci Eng. 2008; 498 (1/2): 248–257. International Conference on Recent Advances in Composite Materials (ICRACM 2007). doi: 10.1016/j.msea.2008.08.024
10.
HuangI-WHurleyBLYangF, et al. Dependence on temperature, pH, and Cl- in the uniform corrosion of aluminum alloys 2024-T3, 6061-T6, and 7075-T6. Electrochim Acta. 2016; 199: 242-–253. doi: 10.1016/j.electacta.2016.03.125
11.
PippigRSchmidlESteinertP, et al. Experimental and numerical investigation of the residual yield strength of aluminium alloy en aw-2024-T3 affected by artificially produced pitting corrosion. IOP Conf Ser Mater Sci Eng. 2017; 181 (1): 012023.
12.
PidapartiRMRaoAS.Analysis of pits induced stresses due to metal corrosion. Corros Sci. 2008; 50 (7): 1932–1938. doi: 10.1016/j.corsci.2008.05.003
13.
CeritMGenelKEksiS.Numerical investigation on stress concentration of corrosion pit. Eng Fail Anal. 2009; 16 (7): 2467–2472. doi: 10.1016/j.engfailanal.2009.04.004
14.
JonesKHoeppnerDW.Pit-to-crack transition in pre-corroded 7075-T6 aluminum alloy under cyclic loading. Corros Sci. 2005; 47 (9): 2185–2198. doi: 10.1016/j.corsci.2004.10.004
15.
van der WaldeKBrockenbroughJCraigB, et al. Multiple fatigue crack growth in pre-corroded 2024-T3 aluminum. Int J Fatigue. 2005; 27 (10-12): 1509–1518. Fatigue Damage of Structural Materials {V5th} International Conference on Fatigue Damage of Structural Materials. doi: 10.1016/j.ijfatigue.2005.06.026
16.
PantelakisSKermanidisAEffect of corrosion on the mechanical behaviour of aircraft aluminum alloys. In Benavides S, editor. Corrosion control in the aerospace industry. Woodhead Publishing Series in Metals and Surface Engineering. Patras: Woodhead Publishing; 2009. p. 67-108.
17.
PetroyiannisPLabeasGPantelakisSNumerical investigation on the tensile behaviour of pre-corroded 2024 aluminium alloy. In Fracture of nano and engineering materials and structures, Proceedings of the 16th European Conference of Fracture. Patras: Springer, 2006. p. 1297-1298.
18.
SetsikaDTserpesKPantelakisS.Numerical simulation of tensile behavior of corroded aluminum alloy 2024 T3. Int J Integt. 2015; 6 (4): 451–467.
19.
TurnbullAWrightLCrockerL.New insight into the pit-to-crack transition from finite element analysis of the stress and strain distribution around a corrosion pit. Corros Sci. 2010; 52 (4): 1492–1498. doi: 10.1016/j.corsci.2009.12.004
20.
LeisingC.Pitting corrosion measurement using 3D profilometry. Technical report, NANOVEA; 2014.
21.
LiDCelestinAMansouriA.Corrosion surface analysis using profilometry. Technical report, NANOVEA; 2015.
22.
BoagATaylorRJMusterTH, et al. Stable pit formation on AA2024-T3 in a NaCl environment. Corros Sci. 2010; 52 (1): 90–103. doi: 10.1016/j.corsci.2009.08.043
23.
BirbilisNCavanaughMBuchheitR.Electrochemical behavior and localized corrosion associated with Al7Cu2Fe particles in aluminum alloy 7075-t651. Corros Sci. 2006; 48 (12): 4202–4215. doi: 10.1016/j.corsci.2006.02.007
