Browse > Article
http://dx.doi.org/10.14773/cst.2020.19.1.8

Corrosion Protection Properties of Cobalt Salt for Water-Based Epoxy Coatings on 2024-T3 Aluminum Alloy  

Thai, Thu Thuy (Institute for Tropical Technology, Vietnam Academy of Science and Technology)
Trinh, Anh Truc (Institute for Tropical Technology, Vietnam Academy of Science and Technology)
Pham, Gia Vu (Institute for Tropical Technology, Vietnam Academy of Science and Technology)
Pham, Thi Thanh Tam (Faculty of Chemistry, VNU University of Science, Vietnam National University)
Xuan, Hoan Nguyen (Faculty of Chemistry, VNU University of Science, Vietnam National University)
Publication Information
Corrosion Science and Technology / v.19, no.1, 2020 , pp. 8-15 More about this Journal
Abstract
In this paper, the efficiency and the inhibition mechanisms of cobalt salts (cobalt nitrate and cobalt-exchange silica Co/Si) for the corrosion protection of AA2024 were investigated in a neutral aqueous solution by using the electrochemical impedance spectroscopy (EIS) and polarization curves. The experimental measurements suggest that cobalt cation plays a role as a cathodic inhibitor. The efficiency of cobalt cation was important at the concentration range from 0.001 to 0.01 M. The formation of precipitates of oxides/hydroxides of cobalt on the surface at low inhibitor concentration was confirmed by the Scanning Electron Microscopy/Energy Dispersive X-Ray Spectroscopy (SEM/EDS) analysis. EIS measurements were also conducted for the AA2024 surface covered by water-based epoxy coating comprising Co/Si salt. The results obtained from exposure in the electrolyte demonstrated the improvement of the barrier and inhibition properties of the coating exposed in the electrolyte solution for a lengthy time. The SEM/EDS analysis in artificial scribes of the coating after salt spray testing revealed the release of cobalt cations in the coating defect to induce the barrier layer on the exposed AA2024 substrate.
Keywords
Aluminum alloy; Cobalt-exchange silica; Corrosion inhibition; EIS;
Citations & Related Records
연도 인용수 순위
  • Reference
1 E. Ghasemi, B. Ramezanzadeh, S. Saket, and S. Ashhari, J. Coat. Technol. Res., 13, 97 (2016).   DOI
2 M. Amiri1, M. Salavati-Niasari1, A. Akbari1, and R. Razavi, J. Mater. Sci.: Mater. Electron., 28, 10495 (2017).   DOI
3 P. Rodic, I. Milosev, M. Lekka, F. Andreatta, and L. Fedrizzi, Electrochim. Acta, 308, 337 (2019).   DOI
4 H. Tamura, N. Katayama, and R. Furuichi, J. Colloid Interf. Sci., 195, 192 (1997).   DOI
5 K. Bonnel, C. Le Pen, and N. Pebere, Electrochim. Acta, 44, 4259 (1999).   DOI
6 J. Vander Kloet, W. Schmidt, A. W. Hassel, and M. Stratmann, Electrochim. Acta, 48, 1211 (2003).   DOI
7 M. Richetta, J. Material Sci. Eng., 6, 1000397 (2017).   DOI
8 M. A. Jakab, F. Presual-Moreno, and J. R. Scully, J. Electrochem. Soc., 153, B244 (2006).   DOI
9 I. M. Zin, R. L. Howard, S. J. Badger, J. D. Scantlebury, and S. B. Lyon, Prog. Org. Coat., 33, 203 (1998).   DOI
10 M. Kendig, S. Jeanjaquet, R. Addison, and J. Waldrop, Surf. Coat. Technol., 140, 58 (2001).   DOI
11 R. L. Twite and G. P. Bierwagen, Prog. Org. Coat., 33, 91 (1998).   DOI
12 G. Williams, A. J. Coleman, and H. Neil Mc Murray, Electrochim. Acta, 55, 5947 (2010).   DOI
13 G. Boisier, N. Portail, and N. Pebere, Electrochim. Acta, 55, 6182 (2010).   DOI
14 S. J. Garcia, T. A. Markley, J. M. C. Mol, and A. E. Hughes, Corros. Sci., 69, 346 (2013).   DOI
15 S. Marcelin and N. Pebere, SCorros. Sci., 101, 66 (2015).   DOI
16 A. J. Aldykiewicz Jr., H. S. Isaacs, and A. J. Davenport, J. Electrochem. Soc., 142, 3342 (1995).   DOI
17 P. Visser, H. Terryn, and J. M. C. Mol, Corros. Sci., 140, 272 (2018).   DOI
18 H. Allachi, F. Chaouket, and K. Draoui, J. Alloy. Compd., 475, 300 (2009).   DOI
19 M. Bethencourt, F. J. Botana, J. J Calvino, M. Marcos, and M. A. Rodriguez-Chacon, Corros. Sci., 40, 1803 (1998).   DOI
20 A. Davenport, H. Isaacs, and M. Kendig, J. Electrochem. Soc., 136, 1837 (1989).   DOI
21 M. Dabala, L. Armelao, A. Buchberger, and I. Calliari, Appl. Surf. Sci., 172, 312 (2001).   DOI
22 M. G. A. Khedr and A. M. S. Lashien, Corros. Sci., 33, 137 (1992).   DOI
23 M. Mahdavian and M. M. Attar, Corros. Sci., 51, 409 (2009).   DOI
24 A. C. Balaskas, M. Curioni, and G. E. Thompson, J. Electrochem. Soc., 161, C389 (2014).   DOI
25 H. Leidheiser Jr. and I. Suzuki, J. Electrochem. Soc., 128, 242 (1981).   DOI
26 H. Leidheiser Jr. and G. W. Simmons, J. Electrochem. Soc., 129, 1658 (1982).   DOI
27 A. G. Munoz, Corros. Sci., 47, 2307 (2005).   DOI
28 J. Xiong, D. K. Sarkar, and X-G. Chen, Appl. Surf. Sci., 407, 361 (2017).   DOI
29 N. Soltani, H. Salavati, and A. Moghadasi, Surf. Interface., 15, 89 (2019).   DOI
30 F. Snogan, C. Blanc, G. Mankowski, and N. Pebere, Surf. Coat. Technol., 154, 94 (2002).   DOI