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Nano-scale mechanical and wear properties of a waterborne hydroxyacrylic-melamine anti-corrosion coating
KTH Royal Institute of Technology, Sweden.
KTH Royal Institute of Technology, Sweden.
KTH Royal Institute of Technology, Sweden.
RISE - Research Institutes of Sweden, Bioscience and Materials, Surface, Process and Formulation.ORCID iD: 0000-0001-8775-0602
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2018 (English)In: Applied Surface Science, ISSN 0169-4332, E-ISSN 1873-5584, Vol. 457, p. 548-558Article in journal (Refereed) Published
Abstract [en]

Corrosion protection is commonly achieved by applying a thin polymer coating on the metal surface. Many studies have been devoted to local events occurring at the metal surface leading to local or general corrosion. In contrast, changes occurring in the organic coating after exposure to corrosive conditions are much less studied. In this article we outline how changes in the coating itself due to curing conditions, environmental and erosion effects can be investigated at the nanometer scale, and discuss how such changes would affect its corrosion protection performance. We focus on a waterborne hydroxyacrylic-melamine coating, showing high corrosion protection performance for carbon steel during long-term (≈35 days) exposure to 0.1 M NaCl solution. The effect of curing time on the conversion of the crosslinking reaction within the coating was evaluated by fourier transform infrared spectroscopy (FTIR); the wetting properties of the cured films were investigated by contact angle measurement, and the corrosion resistance was studied by electrochemical impedance spectroscopy (EIS). In particular, coating nanomechanical and wear properties before and after exposure to 0.1 M NaCl, were evaluated by atomic force microscopy (AFM). Fiber-like surface features were observed after exposure, which are suggested to arise due to diffusion of monomers or low molecular weight polymers to the surface. This may give rise to local weakening of the coating, leading to local corrosion after even longer exposure times. We also find a direct correlation between the stick-slip spacing during shearing and plastic deformation induced in the surface layer, giving rise to topographical ripple structures on the nanometer length scale.

Place, publisher, year, edition, pages
2018. Vol. 457, p. 548-558
Keywords [en]
Electrochemical impedance spectroscopy, Fast fourier transform analysis, Nanomechanical property, Nanowear, Waterborne anti-corrosive coating, Atomic force microscopy, Contact angle, Corrosion resistance, Crosslinking, Curing, Electrochemical corrosion, Fast Fourier transforms, Fourier transform infrared spectroscopy, Localized corrosion, Nanotechnology, Organic coatings, Plastic coatings, Polymers, Slip forming, Sodium chloride, Steel corrosion, Stick-slip, Wear of materials, Wetting, Anti-corrosive coatings, Corrosion protection performance, Crosslinking reaction, Fast fourier, Low-molecular-weight polymers, Nano Wear, Nanometer length scale, Corrosion resistant coatings
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Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-34497DOI: 10.1016/j.apsusc.2018.06.284Scopus ID: 2-s2.0-85049824578OAI: oai:DiVA.org:ri-34497DiVA, id: diva2:1237615
Note

Funding details: AFM, Advanced Foods and Materials Canada;

Funding details: CSC, China Scholarship Council;

Funding details: VR [ 2015-05080, VR, Vetenskapsrådet;

Available from: 2018-08-09 Created: 2018-08-09 Last updated: 2018-08-09Bibliographically approved

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Ahniyaz, Anwar

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