The Effect of Heat Treatment on the Long-Term Corrosion Resistance in Er Containing 5083 Cold Rolled Sheets

Abstract:

The effect of heat treatment on the long-term corrosion resistance of Er containing 5083 aluminum alloy was studied using the micro-hardness test and mass loss test. The microstructure was analyzed by TEM. To maintain the strength, the annealing temperature was selected to be 100-230°C below the recrystallization onset temperature determined by the micro-hardness test. The plot of the annealing temperature versus the Intergranular Corrosion (IGC) initial time, which is determined by the Nitric Acid Mass Loss Test, showed a C-curve. The shortest IGC initial time (~1h) happened at 175°C, the nose temperature of the C-curve. When annealed at 125-200°C, the samples were IGC sensitive with the initial time less than 3h. The entirely IGC resistant (stabilized) samples were obtained when annealed at 220-230°C. The 175°C sensitized treatment was performed on the 220°C-stabilized samples, which showed that the 3-12h stabilization could significantly improve the resistance for long-term corrosion. TEM results showed that, for the IGC sensitive samples, β phases (Al₃Mg₂) grew along the grain boundary continuously, while for the stabilized samples, they were isolated on triangle grain boundary and phase boundary.

• Periodical: Materials Science Forum (Volumes 794-796)
• Pages: 199-204
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.794-796.199
• Online since: June 2014
• Authors: Kun Yuan Gao, Zuo-Ren Nie*, Huang Hui, Sheng Ping Wen, Xiao Lan Wu, Yu Sheng Ding
• Keywords: Al-Mg Alloy, ER, Mass Loss Test, Stabilized

References

[1] JAIN S, LIM M L C, HUDSON J L, et al. Spreading of intergranular corrosion on the surface of sensitized Al-4. 4Mg alloys: A general finding, J. Corrosion Science, 2012, 59: 136–147.

DOI: 10.1016/j.corsci.2012.02.018

[2] ARGADE G. R, N. KUMAR, R.S. MISHRA. Stress corrosion cracking susceptibility of ultrafine grained Al–Mg–Sc alloy, J. Materials Science & Engineering A, 2013, 565: 80–89.

DOI: 10.1016/j.msea.2012.11.066

[3] ZHU Y, KAR S, FREE M L, et al. Long-term corrosion damage prediction modeling of AA5083 alloys based on experiment, theory, and molecular dynamics simulations, J. Salt Lake City, UT: University of Utah, 20953, (2011).

[4] GOSWAMI R, SPANOS G, PAO P S, et al. Precipitation behavior of the β phase in Al-5083, J. Materials Science and Engineering A, 2010, 527: 1089–1095.

DOI: 10.1016/j.msea.2009.10.007

[5] GOSWAMI R, HOLTZ R L. Transmission Electron Microscopic Investigations of Grain Boundary Beta Phase Precipitation in Al 5083 Aged at 373 K (100 ℃), J. Metallurgical and Materials Transactions A, 2012, 30: 1210-1220.

DOI: 10.1007/s11661-012-1166-9

[6] KRAMER L, PHILLIPPI M, TACK W T, WONG C. Locally Reversing Sensitization in 5xxx Aluminum Plate, J. Journal of Materials Engineering and Performance, 2012; 21(6): 1025–1029.

DOI: 10.1007/s11665-011-9998-9

[7] GOSWAMI R, SPANOS G, PAO P S, et al. Precipitation behavior of the β phase in Al-5083, J. Materials Science and Engineering A, 2010, 527: 1089–1095.

DOI: 10.1016/j.msea.2009.10.007

[8] CHOI D H, AHN B W, QUESNEL D J, et al. Behavior of β phase (Al3Mg2) in AA 5083 during friction stir welding, J. Intermetallics, 2013, 35: 120-127.

DOI: 10.1016/j.intermet.2012.12.004

[9] VARGEL C, JACQUES M, SCHMIDT M P. Corrosion of Aluminum. Paris, French. (2004).

[10] SEARLES J L, GOUMA P I, BUCHHEIT R G. Stress corrosion cracking of sensitized AA5083 (Al-4. 5Mg-1. 0Mn), J. Metallurgical and Materials Transactions A, 2001, 32A (11): 2859-2867.

DOI: 10.1007/s11661-001-1036-3

[11] MARQUIS E A, Seidman D N, ASTA M, et al. Composition evolution of nanoscale Al3Sc precipitates in an Al–Mg–Sc alloy: experiments and computations J. Acta Materialia, 2006, 54: 119–130.

DOI: 10.1016/j.actamat.2005.08.035

[12] KENDIG K L, MIRACLE D B. Strengthening mechanisms of an Al-Mg-Sc-Zr alloy J. Acta Materialia, 2002, 50: 4165–4175.

DOI: 10.1016/s1359-6454(02)00258-6

[13] WEN S P, GAO K Y, LI Y, et al. Synergetic effect of Er and Zr on the precipitation hardening of Al–Er–Zr alloy J. Scripta Materialia, 2011, 65: 592–595.

DOI: 10.1016/j.scriptamat.2011.06.033

[14] WEN S P, XING Z B, HUANG H, et al. The effect of erbium on the microstructure and mechanical properties，J. Materials Science and Engineering A, 2009, 516: 42-49.

[15] 10. 1520/G0067-2013. Standard test method for determining the susceptibility to intergranular corrosion of 5XXX series aluminum alloys by mass loss after exposure to nitric acid (NAMLT Test), S.

DOI: 10.1520/g0067

[16] 10. 1520/B0928_B0928M-2009. Standard specification for high magnesium aluminum-alloy sheet and plate for marine service and similar environments, S.