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- Presence of the corrosive medium at the coating/metal interface can destroy the electrostatic interactions between the coating and metal, and consequently, weaken the coating adhesion and promote metallic corrosion under the film.
pubs.rsc.org/en/content/articlelanding/2017/ra/c7ra04878eA new understanding of the failure of waterborne acrylic coatings
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Feb 29, 2024 · In reality, many waterborne acrylics contain small amounts of coalescing agents added to the formula to improve the ability of the coating to wet the surface and to speed the fusion (melting together) of the acrylic/latex particles.
- Introduction
- Experiment
- Results
- Discussions
- Acknowledgements
Although, a coating can provide corrosion protection for a metal substrate by creating a barrier on the surface, inevitably macro or micro defects get formed on it during the film-forming process, and the coating can undergo a chemical or physical change owing to the external environmental attack.9 These in turn will generate pathways for water, di...
2.3 Characterization of the coating
The Data Physics contact angle measurement system (OCA20) was used to measure the contact angle of different coating surfaces, and the volume of water was approximately 5 μL. Differential scanning calorimetry (DSC) measurements were performed under N2 gas using DSC Q2000 (TA Instruments) at a heating rate of 10 °C min−1. The glass transition temperature (Tg) of the epoxy was determined as the inflection temperature, while the Tmvalue was obtained from the endothermic peak in the DSC curve. Th...
2.6 Electrochemical test
LEIS measurements were performed on the coating specimens that were immersed in the 3.5 wt% NaCl solution via a PAR Model 370 Scanning Electrochemical Workstation. The test solution for the LEIS measurements was 0.001 M NaCl solution. The microprobe was stepped over a designated area of the electrode surface. The scanning took the form of a raster in the x–yplane. The step size was controlled to obtain a plot of 32 × 21 lines. The AC disturbance signal was 100 mV, and the excitation frequency...
3.1 Properties of the coatings
Hydrophobicity of both coating surfaces was tested via contact angle measurements. The results (Table 1) show that the contact angles of the styrene–acrylic coating is 76.0 ± 1.6°, which implies the coating surface can repel water or other liquids to a certain degree. The terpolymer coating has a smaller contact angle of 50.0 ± 0.2°, indicating its hydrophilicity and easiness to absorb water compared to the styrene–acrylic coating. The presence of benzene rings, which favors the hydrophobic p...
3.2 Wet adhesion testing
Fig. 3a shows the wet adhesive force of intact coating corresponding to the wet adhesion tests under different test cycles. The initial adhesive force of the styrene–acrylic coating is approximately 5 MPa, which is almost twice that of the terpolymer coating (2.75 MPa). This can be attributed to the difference in the failure modes. The terpolymer coating is extremely soft to withstand the pulling force.30,31Both of coatings keep little change during the immersion time. Fig. 3bshows the wet ad...
3.4 Electrochemical behavior of the coatings with 85 μm thickness
For the terpolymer coating, the immersed coating undergoes three immersion stages as observed from the Bode (Fig. 5c) and Nyquist plots (Fig. 5d) of the EIS spectra. Before 110 days, the immersed coating stays in the first stage, which is similar to the styrene–acrylic coating, such that a low-frequency impedance is found above 1010 Ω and the coating impedance acts as a capacitance arc. The coating gradually deteriorates around 150 days of immersion with the low-frequency impedance decreasing...
Fig. 18 shows the SIMS results of the terpolymer coating on the carbon steel surface. In SIMS, ionized particles are ejected from the surface by the bombardment of a primary ion beam (Ar+, F−, O2+, O−, and Cs+) and then separate according to masses. Both atoms and molecules can be ionized. Thus, details about the chemical state of atoms in the surf...
X. Li, D. Zhang, Z. Liu, Z. Li and C. Du, Nature, 2015, 527, 441–442 CrossRef CAS PubMed.H. Vakili, B. Ramezanzadeh and R. Amini, Corros. Sci., 2015, 94, 466–475 CrossRef CAS.M. S. Ghaffari, R. Naderi and M. Sayehbani, Prog. Org. Coat., 2015, 86, 117–124 CrossRef CAS.M. F. Montemor, Surf. Coat. Technol., 2014, 258, 17–37 CrossRef CAS.- Hongxia Wan, Dongdong Song, Xiaogang Li, Xiaogang Li, Dawei Zhang, Jin Gao, Cuiwei Du
- 2017
Metal substrates can corrode at an accelerated pace if they lack a protective barrier to keep water and electrolytes from reaching the surface, and waterborne acrylic DTM coatings can deliver effective protection to metal surfaces in light- and medium-duty service environments.
Waterborne direct-to-metal (DTM) coatings are just one category of coatings designed to protect metal substrates. We begin by considering the science behind the corrosion process and the methods by which a coating can prevent corrosion.
- You can’t apply a waterborne coating directly to metal because it will rust. “This is not true. Formulators are successful with waterborne DTM coatings without using a primer,” says Tony Neely, Technical Specialist at BASF.
- Waterborne coatings can redissolve from rain or humidity, decreasing effectiveness. This myth arises from a misunderstanding of how waterborne coatings work.
- Waterborne coatings take a very long time to dry. Once again, the key to achieving a faster dry time is in the additives and formulation of the coating.
Formulating Corrosion-resistant Coatings. The corrosion protection provided by waterborne acrylic coatings is highly dependent on both the resin and the formulation of the coating. Often, attempting to drop in or directly replace resins in waterborne formulations does not result in optimum performance.
Oct 21, 2024 · Corrosion protection of bronze, a metal alloy which is commonly used in decorative architectural elements and for statuary, is a challenge particularly as new and previously untested water-borne coatings are supplanting traditionally used solvent based polymers as protective coatings.
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