Synergistic Effect of Nanoclay and Barium Sulfate Fillers on the Corrosion Resistance of Polyester Powder Coatings
Source abstract
Abstract
Nanoclay has proven to be an active anti-corrosive additive due to the self-repairing effect from nanoclay swelling and expansion, except for its passive barrier effect due to the high aspect ratio. But it is still uncertain how these effects of nanoclay are intertwined with the other components in a complex coating system in corrosive environments. In this study, we examined the combined effects of nanoclays of two particle sizes with a commonly used cost-reducing filler, BaSO4. By employing neutral salt spray tests, electrochemical analysis, and surface characterization, we identified the optimal conditions for achieving a strong barrier effect. Surprisingly, a relatively low nanoclay dosage of 2% combined with BaSO4 filler exhibited synergistic behavior. Nanoclay not only compensated for the reduction in the barrier effect owing to the addition of BaSO4 by offering self-repairing and barrier effects, but also overcame the delamination issues observed at higher nanoclay dosages (4% and above). The coating panel with 2% larger nanoclay and BaSO4 showed two orders of magnitude higher pore resistance than the coating without nanoclay, remaining at 107 Ω∙cm2 after 25 days of immersion. As a result, this coating panel demonstrated significantly slower corrosion expansion and reached a lifetime of 2500 h when creepage exceeded 2 mm in salt spray tests. This study contributes to a full understanding and proper utilization of nanoclay for high-performance, smart anti-corrosive coatings.
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Research context
OpenAlex topics: Polymer Nanocomposites and Properties · Polymer composites and self-healing · Tribology and Wear Analysis
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
School of Mechatronics Engineering, Harbin Institute of Technology, Harbin 150001, China
Zhengzhou Research Institute, Harbin Institute of Technology, Zhengzhou 450000, China
Department of Chemical and Biochemical Engineering, Western University, London, ON N6A 5B9, Canada
Department of Chemistry, Western University, London, ON N6A 5B7, Canada
Department of Statistical and Actuarial Sciences, Western University, London, ON N6A 5B7, Canada
Surface Science Western, Western University, London, ON N6G 0J3, Canada
School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
Funding
The Key Basic Research Project · The Natural Sciences and Engineering Research Council of Canada (NSERC) Discovery Grants · Canada Research Chairs Program · the Wolfe-Western Fellowship · Mitacs-Accelerate PhD Fellowship
References (36)
Show source-provided references
1. Anticorrosive Coatings: A Review10.1007/s11998-008-9144-2 ↗
2. Functional and Smart Coatings for Corrosion Protection: A Review of Recent Advances10.1016/j.surfcoat.2014.06.031 ↗
3. A Study of the Effects of Pigments and Fillers on the Properties of Anticorrosive Paints10.1108/03699420610652377 ↗
4. Influence of Natural Inhibitor, Pigment and Extender on Corrosion of Polymer Coated Steel10.1016/j.porgcoat.2010.08.003 ↗
5. Permeability of Polymers in Protective Organic Coatings10.1016/j.porgcoat.2003.09.015 ↗
6. Internal Stress and Wet Adhesion of Organic Coatings10.1016/0300-9440(95)00606-0 ↗
7. Yang, M.S., Huang, J., Zhang, H., Noël, J.J., Hedberg, Y.S., Chen, J., Eduok, U., Barker, I., Henderson, J.D., and Xian, C. (2023). Study on the Self-Repairing Effect of Nanoclay in Powder Coatings for Corrosion Protection. Coatings, 13.10.3390/coatings13071220 ↗
8. Polymer Nanocomposites from Modified Clays: Recent Advances and Challenges10.1016/j.progpolymsci.2015.10.001 ↗
9. Al-Shahrani, A., Taie, I., Fihri, A., and Alabedi, G. (2018). Current Topics in the Utilization of Clay in Industrial and Medical Applications, IntechOpen.
10. Spyrou, E. (2012). Powder Coatings: Chemistry and Technology, Vincentz Network GmbH & Co KG. [3rd ed.].
11. Investigation of the Recyclability of Powder Coatings10.1016/j.powtec.2011.03.016 ↗
12. Effect of Pigmentation on Organic Coating Characteristics10.1016/j.porgcoat.2004.03.002 ↗
13. Li, W., Franco, D.C., Yang, M.S., Zhu, X., Zhang, H., Shao, Y., Zhang, H., and Zhu, J. (2019). Comparative Study of the Performances of Al(OH)3 and BaSO4 in Ultrafine Powder Coatings. Processes, 7.10.3390/pr7050316 ↗
14. Fan, X. (2008, January 20–23). Mechanics of Moisture for Polymers: Fundamental Concepts and Model Study. Proceedings of the EuroSimE 2008—International Conference on Thermal, Mechanical and Multi-Physics Simulation and Experiments in Microelectronics and Micro-Systems 2008, Breisgau, Germany.
15. Yang, S., Huang, J., Chen, J., Noël, J.J., Barker, I., Henderson, J.D., He, P., Zhang, H., Zhang, H., and Zhu, J. (2022). A Comparative Study on the Anti-Corrosive Performance of Zinc Phosphate in Powder Coatings. Coatings, 12.10.3390/coatings12020217 ↗
16. Adduct Modified Nano-Clay Mineral Dispersed Polystyrene Nanocomposites as Advanced Corrosion Resistance Coatings for Aluminum Alloys10.1016/j.clay.2016.03.005 ↗
17. Synthesis, Characterisation and Electrochemical Application of Hybrid Nanocomposites of Polyaniline with Novel Clay Mineral
18. Effect of Nano Clay on Corrosion Protection of Zinc-Rich Epoxy Coatings on Steel 3710.1016/j.jmst.2016.08.017 ↗
19. Synergy between Fillers in Organomontmorillonite/Graphene-PLA Nanocomposites10.1016/j.clay.2015.08.017 ↗
20. Powder Coatings
21. Montmorillonite: An Introduction to Properties and Utilization
22. Guo, F., Aryana, S., Han, Y., and Jiao, Y. (2018). A Review of the Synthesis and Applications of Polymer-Nanoclay Composites. Appl. Sci., 8.10.3390/app8091696 ↗
23. (2017). Standard Practice for Preparation of Cold-Rolled Steel Panels for Testing Paint, Varnish, Conversion Coatings, and Related Coating Products (Standard No. ASTM D609).
24. (2013). Standard Practice for Nondestructive Measurement of Dry Film Thickness of Nonmagnetic Coatings Applied to Ferrous Metals and Nonmagnetic, Nonconductive Coatings Applied to Non-Ferrous Metals (Standard No. ASTM D7091).
25. Ultrafine Powder Coatings: An Innovation
26. (2014). Standard Test Method for Specular Gloss (Standard No. ASTM D523).
27. (2018). Standard Test Method for Instrumental Measurement of Distinctness-of-Image (DOI) Gloss of Coated Surfaces (Standard No. ASTM D5767).
28. (2009). Standard Test Methods for Measuring Adhesion by Tape Test (Standard No. ASTM D3359).
29. (2005). Standard Test Method for Film Hardness by Pencil Test (Standard No. ASTM D3363).
30. (1993). Standard Test Method for Resistance of Organic Coatings to the Effects of Rapid Deformation (Impact) (Standard No. ASTM D2794).
31. A Critical Review of d.c. Electrochemical Tests for Painted Metals10.1016/0010-938X(86)90121-6 ↗
32. (2008). Standard Practice for Evaluating Degree of Rusting on Painted Steel Surfaces (Standard No. ASTM D610).
33. Evalution of Organic Coatings with Electrochemical Impedance Spectroscopy Part 2: Application of EIS to Coatings
34. EIS and Organic Coatings Performance: Revisiting Some Key Points10.1016/j.electacta.2020.136725 ↗
35. (2016). Standard Practice for Operating Salt Spray (Fog) Apparatus (Standard No. ASTM B117).
36. (2008). Standard Test Method for Evaluation of Painted or Coated Specimens Subjected to Corrosive Environments (Standard No. ASTM D1654).