Self-healing epoxy coating based on tung oil-containing microcapsules for corrosion protection

The objective of the current research is to evaluate and compare the corrosion protection efficiency of the microcapsules containing tung oil and copaiba oil using stereoscopic images, electrochemical tests, open circuit potential (OCP), and polarization curves (Tafel analysis). Carbon steel plates were painted with three different coating systems: (a) a coating system with an automotive primer which served as the control, (b) a coating system with microcapsules containing 3% tung oil, and (c) a coating system with microcapsules containing 3% copaiba oil. A crosscut was performed using a scalpel on the coating surfaces to promote the release of the oils, and after drying, electrochemical cells were assembled using electrolyte 3% NaCl. From OCP analyses, it was verified that the coating system containing tung oil loaded microcapsules obtained more positive final values than the control system and the coating system containing copaiba oil loaded microcapsules. The stereoscope images corroborate the OCP results, and the polarization curve analyses also indicated that the microcapsules containing tung oil offer better corrosion protection than the other systems studied.

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Preparation and application of polysulfone microcapsules containing tung oil in self-healing and self-lubricating epoxy coating

Colloids and Surfaces A Physicochemical and Engineering Aspects ◽

10.1016/j.colsurfa.2017.01.046 ◽

2017 ◽

Vol 518 ◽

pp. 181-187 ◽

Cited By ~ 47

Author(s):

Haiyan Li ◽

Yexiang Cui ◽

Huaiyuan Wang ◽

Yanji Zhu ◽

Baohui Wang

Keyword(s):

Epoxy Coating ◽

Self Healing ◽

Tung Oil

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Self-healing epoxy coating for corrosion protection

Focus on Powder Coatings ◽

10.1016/j.fopow.2021.07.021 ◽

2021 ◽

Vol 2021 (8) ◽

pp. 5

Keyword(s):

Corrosion Protection ◽

Epoxy Coating ◽

Self Healing

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Corrosion Protection and Self-Healing by Sol-Gel Process: A Review of Recent Patent Literature

Recent Patents on Corrosion Sciencee ◽

10.2174/2210683911202020148 ◽

2012 ◽

Vol 2 (2) ◽

pp. 148-163 ◽

Cited By ~ 6

Author(s):

N. Kumar ◽

R. Subasri

Keyword(s):

Corrosion Protection ◽

Sol Gel ◽

Self Healing ◽

Sol Gel Process ◽

Patent Literature

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Protection of Carbon Steel Rebars by Epoxy Coating with Smart Environmentally Friendly Microcapsules

Coatings ◽

10.3390/coatings11020113 ◽

2021 ◽

Vol 11 (2) ◽

pp. 113

Author(s):

Jacob Ress ◽

Ulises Martin ◽

Juan Bosch ◽

David M. Bastidas

Keyword(s):

Electrochemical Impedance Spectroscopy ◽

Impedance Spectroscopy ◽

Corrosion Protection ◽

Corrosion Potential ◽

Electrochemical Impedance ◽

Pore Solution ◽

Control Sample ◽

Chloride Ions ◽

Epoxy Coating ◽

Transfer Resistance

The protection of mild steel by modified epoxy coating containing colophony microencapsulated corrosion inhibitors was investigated in this study. The corrosion behavior of these epoxy coatings containing colophony microcapsules was studied by electrochemical analysis using cyclic potentiodynamic polarization and electrochemical impedance spectroscopy. The microcapsule coating showed decreased corrosion current densities of 2.75 × 10−8 and 3.21 × 10−8 A/cm2 along with corrosion potential values of 0.349 and 0.392 VSCE for simulated concrete pore solution and deionized water with 3.5 wt.% NaCl, respectively, indicating improved corrosion protection in both alkaline and neutral pH. Electrochemical impedance spectroscopy analysis also showed charge transfer resistance values over one order of magnitude higher than the control sample, corroborating the electrochemical corrosion potential and current density testing results. Overall, the use of colophony microcapsules showed improved corrosion protection in simulated concrete pore solution and DI water solutions containing chloride ions.

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