MICROSTRUCTURE EVOLUTION AND CORROSION BEHAVIOR OF Al-Si/Al-Mn COMPOSITES IN SALT SPRAY

  • Zhifeng Li College of Mechanical and Electrical Engineering, Central South University, Changsha 410083
Keywords: Al-Si/Al-Mn composites, salt spray, pitting corrosion, electrochemical impedance spectroscopy

Abstract

Al-Si/Al-Mn composites are commonly used in aluminum heat exchangers. Improving their corrosion resistance is the key for prolonging their service life and reducing their costs. In this paper, an artificial salt spray corrosion test was adopted in accordance with the ASTM G85 standard to evaluate the atmospheric corrosion resistance of Al-Si/Al-Mn composites. The corroded samples were tested with electrochemical impedance spectroscopy (EIS). Microstructure evolution and their corrosion mechanism were discussed after the use of OM, SEM, EPMA and XRD. The results showed two corrosion mechanisms, including the pitting-induction mechanism and intergranular-development mechanism: pitting is induced by the destruction of the passive film as Cl is adsorbed at the defects, while the corrosive medium in the pitting pores expands along the grain boundaries where eutectic Si is enriched. A corrosion process can be divided into three periods: the pitting-induction period, pitting-propagation period and matrix-corrosion period. The equivalent circuit models established sequentially were consistent with the actual macroscopic and microscopic observations.

References

[1] M.J. Benoit, H. Jin, B. Shalchi-Amirkhiz, S. Kurukuri, S. Winkler, M.J. Worswick, M.A. Wells, Microstructure evolution of warm deformed multilayered Al alloy sheet during brazing, Journal of Materials Processing Technology, 281 (2020) 116639.
[2] S.T.W. Kuruneru, K. Vafai, E. Sauret, Y. Gu, Application of porous metal foam heat exchangers and the implications of particulate fouling for energy-intensive industries, Chemical Engineering Science, 228 (2020).
[3] H. Rastan, A. Abdi, B. Hamawandi, M. Ignatowicz, J.P. Meyer, B. Palm, Heat transfer study of enhanced additively manufactured minichannel heat exchangers, International Journal of Heat and Mass Transfer, 161 (2020).
[4] P. Oclon, P. Cisek, E. Kozak-Jagiela, J. Taler, D. Taler, D. Skrzyniowska, M. Fedorczak-Cisak, Modeling and experimental validation and thermal performance assessment of a sun-tracked and cooled PVT system under low solar irradiation, Energy Conversion and Management, 222 (2020).
[5] H. Güllüce, K. Özdemir, Design and operational condition optimization of a rotary regenerative heat exchanger, Applied Thermal Engineering, 177 (2020) 115341.
[6] M. Bezaatpour, H. Rostamzadeh, J. Bezaatpour, M. Ebadollahi, Magnetic-induced nanoparticles and rotary tubes for energetic and exergetic performance improvement of compact heat exchangers, Powder Technology, 377 (2021) 396-414.
[7] F.C. Alverson, M. Ranger, H.J. DeBaun, The Effects of Residual Controlled Atmospheric Brazing Flux on Engine Coolants, in: E.R. Eaton (Ed.) Global Testing of Extended Service Engine Coolants and Related Fluids, 2014, pp. 175-194.
[8] A. Akbari, S. Kouravand, S. Pourahmad, A comprehensive study of the second law of thermodynamics for a rotary regenerative heat exchanger with two types of simple and anodized aluminum sheets: an experimental study, Energy Sources Part a-Recovery Utilization and Environmental Effects, (2020).
[9] E. Emmons, P.J. Shamberger, Corrosive effect of lithium nitrate trihydrate on common heat exchanger materials, Materials and Corrosion-Werkstoffe Und Korrosion, 70 (2019) 877-887.
[10] L. Jackowski, P. Risse, R. Smith, Impact of Nonuniform Fouling on Operating Temperatures in Heat Exchanger Networks, Heat Transfer Engineering, 38 (2017) 753-761.
[11] L. Bialo, T. Grodniewicz, P. Zabinski, SELECTED CYCLIC CORROSION TESTS IN AUTOMOTIVE INDUSTRY, Archives of Metallurgy and Materials, 65 (2020) 1469-1476.
[12] K. Chandra, V. Kain, S.K. Sinha, H.G. Gujar, Metallurgical investigation of a heat-exchanger tube of 70/30 cupronickel failed by fretting corrosion, Engineering Failure Analysis, 116 (2020) 104756.
[13] H. Peltola, M. Lindgren, Failure analysis of a copper tube in a finned heat exchanger, Engineering Failure Analysis, 51 (2015) 83-97.
[14] S. Nasrazadani, S. Nakka, Characterization of Corrosion Products in RTPF and All-Aluminum Microchannel Heat Exchangers, Journal of Failure Analysis and Prevention, 16 (2016) 189-196.
[15] Y.-S. Kim, I.-J. Park, J.-G. Kim, Simulation Approach for Cathodic Protection Prediction of Aluminum Fin-Tube Heat Exchanger Using Boundary Element Method, Metals, 9 (2019).
[16] J. Su, M. Ma, T. Wang, X. Guo, L. Hou, Z. Wang, Fouling corrosion in aluminum heat exchangers, Chinese Journal of Aeronautics, 28 (2015) 954-960.
[17] S.Y. Cho, J.J. Kim, H.J. Jang, Effects of Zn Coating and Heat Treatment on the Corrosion of Aluminum Heat Exchanger Tubes, Corrosion Science and Technology-Korea, 18 (2019) 24-32.
[18] J. Jung, S. Oh, H. Kwon, Effects of environmental factors on corrosion behavior of aluminum, Materials and Corrosion-Werkstoffe Und Korrosion, (2020).
[19] S. Kumar, H. Singh, N. Gaur, S. Patil, D. Kumar, N. Singh, Imparting increased corrosion passive and bio-active character to Al2O3 based ceramic coating on AZ91 alloy, Surface & Coatings Technology, 383 (2020) 8.
[20] T.T. Thai, A.T. Trinh, G.V. Pham, T.T.T. Pham, H.N. Xuan, Corrosion Protection Properties of Cobalt Salt for Water-Based Epoxy Coatings on 2024-T3 Aluminum Alloy, Corrosion Science and Technology-Korea, 19 (2020) 8-15.
[21] B. Leszczynska-Madej, M. Richert, A. Wasik, A. Szafron, Analysis of the Microstructure and Selected Properties of the Aluminium Alloys Used in Automotive Air-Conditioning Systems, Metals, 8 (2018) 15.
[22] R.M. Katona, S. Tokuda, J. Perry, R.G. Kelly, Design, construction, and validation for in-situ water layer thickness determination during accelerated corrosion testing, Corrosion Science, 175 (2020) 108849.
[23] F. Ciucci, Modeling electrochemical impedance spectroscopy, Current Opinion in Electrochemistry, 13 (2019) 132-139.
[24] Z. Lukacs, T. Kristof, A generalized model of the equivalent circuits in the electrochemical impedance spectroscopy, Electrochimica Acta, 363 (2020).
Published
2022-04-06
How to Cite
1.
Li Z. MICROSTRUCTURE EVOLUTION AND CORROSION BEHAVIOR OF Al-Si/Al-Mn COMPOSITES IN SALT SPRAY. MatTech [Internet]. 2022Apr.6 [cited 2022Jun.27];56(2):139–147. Available from: https://mater-tehnol.si/index.php/MatTech/article/view/354