Temporary Anti-Corrosive Double Layer on Zinc Substrate Based on Chitosan Hydrogel and Epoxy Resin
In practice, metal structures are frequently transported or stored before being used. Even in such circumstances, the corrosion process caused by environmental factors (moisture, salty air, etc.) can occur quite easily. To avoid this, metal surfaces can be protected with temporary coatings. The obje...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-04-01
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| Online Access: | https://www.mdpi.com/2310-2861/9/5/361 |
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| author | Tamara-Rita Ovari Árpád Ferenc Szőke Gabriel Katona Gabriella Stefánia Szabó Liana Maria Muresan |
| author_facet | Tamara-Rita Ovari Árpád Ferenc Szőke Gabriel Katona Gabriella Stefánia Szabó Liana Maria Muresan |
| author_sort | Tamara-Rita Ovari |
| collection | DOAJ |
| description | In practice, metal structures are frequently transported or stored before being used. Even in such circumstances, the corrosion process caused by environmental factors (moisture, salty air, etc.) can occur quite easily. To avoid this, metal surfaces can be protected with temporary coatings. The objective of this research was to develop coatings that exhibit effective protective characteristics while also allowing for easy removal, if required. Novel, chitosan/epoxy double layers were prepared on zinc by dip-coating to obtain temporary tailor-made and peelable-on-demand, anti-corrosive coatings. Chitosan hydrogel fulfills the role of a primer that acts as an intermediary between the zinc substrate and the epoxy film to obtain better adhesion and specialization. The resulting coatings were characterized using electrochemical impedance spectroscopy, contact angle measurements, Raman spectroscopy, and scanning electron microscopy. The impedance of the bare zinc was increased by three orders of magnitude when the protective coatings were applied, proving efficient anti-corrosive protection. The chitosan sublayer improved the adhesion of the protective epoxy coating. The structural integrity and absolute impedance of the protective layers were conserved in both basic and neutral environments. However, after fulfilling its lifespan, the chitosan/epoxy double-layered coating could be removed after treatment with a mild acid without damaging the substrate. This was because of the hydrophilic properties of the epoxy layer, as well as the tendency of chitosan to swell in acidic conditions. |
| first_indexed | 2024-03-11T03:43:08Z |
| format | Article |
| id | doaj.art-e99b473783cf4241abc04e6e63307eb2 |
| institution | Directory Open Access Journal |
| issn | 2310-2861 |
| language | English |
| last_indexed | 2024-03-11T03:43:08Z |
| publishDate | 2023-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Gels |
| spelling | doaj.art-e99b473783cf4241abc04e6e63307eb22023-11-18T01:27:26ZengMDPI AGGels2310-28612023-04-019536110.3390/gels9050361Temporary Anti-Corrosive Double Layer on Zinc Substrate Based on Chitosan Hydrogel and Epoxy ResinTamara-Rita Ovari0Árpád Ferenc Szőke1Gabriel Katona2Gabriella Stefánia Szabó3Liana Maria Muresan4Department of Chemical Engineering, Research Center in Electrochemistry and Non-Conventional Materials, Faculty of Chemistry and Chemical Engineering, Babeş-Bolyai University, RO-400028 Cluj-Napoca, RomaniaDepartment of Chemistry and Chemical Engineering of the Hungarian Line, Faculty of Chemistry and Chemical Engineering, Babeş-Bolyai University, RO-400028 Cluj-Napoca, RomaniaDepartment of Chemistry and Chemical Engineering of the Hungarian Line, Faculty of Chemistry and Chemical Engineering, Babeş-Bolyai University, RO-400028 Cluj-Napoca, RomaniaDepartment of Chemistry and Chemical Engineering of the Hungarian Line, Faculty of Chemistry and Chemical Engineering, Babeş-Bolyai University, RO-400028 Cluj-Napoca, RomaniaDepartment of Chemical Engineering, Research Center in Electrochemistry and Non-Conventional Materials, Faculty of Chemistry and Chemical Engineering, Babeş-Bolyai University, RO-400028 Cluj-Napoca, RomaniaIn practice, metal structures are frequently transported or stored before being used. Even in such circumstances, the corrosion process caused by environmental factors (moisture, salty air, etc.) can occur quite easily. To avoid this, metal surfaces can be protected with temporary coatings. The objective of this research was to develop coatings that exhibit effective protective characteristics while also allowing for easy removal, if required. Novel, chitosan/epoxy double layers were prepared on zinc by dip-coating to obtain temporary tailor-made and peelable-on-demand, anti-corrosive coatings. Chitosan hydrogel fulfills the role of a primer that acts as an intermediary between the zinc substrate and the epoxy film to obtain better adhesion and specialization. The resulting coatings were characterized using electrochemical impedance spectroscopy, contact angle measurements, Raman spectroscopy, and scanning electron microscopy. The impedance of the bare zinc was increased by three orders of magnitude when the protective coatings were applied, proving efficient anti-corrosive protection. The chitosan sublayer improved the adhesion of the protective epoxy coating. The structural integrity and absolute impedance of the protective layers were conserved in both basic and neutral environments. However, after fulfilling its lifespan, the chitosan/epoxy double-layered coating could be removed after treatment with a mild acid without damaging the substrate. This was because of the hydrophilic properties of the epoxy layer, as well as the tendency of chitosan to swell in acidic conditions.https://www.mdpi.com/2310-2861/9/5/361anti-corrosive protectionchitosan/epoxy double layerchitosan hydrogelselective peel-offtemporary coatingszinc |
| spellingShingle | Tamara-Rita Ovari Árpád Ferenc Szőke Gabriel Katona Gabriella Stefánia Szabó Liana Maria Muresan Temporary Anti-Corrosive Double Layer on Zinc Substrate Based on Chitosan Hydrogel and Epoxy Resin Gels anti-corrosive protection chitosan/epoxy double layer chitosan hydrogel selective peel-off temporary coatings zinc |
| title | Temporary Anti-Corrosive Double Layer on Zinc Substrate Based on Chitosan Hydrogel and Epoxy Resin |
| title_full | Temporary Anti-Corrosive Double Layer on Zinc Substrate Based on Chitosan Hydrogel and Epoxy Resin |
| title_fullStr | Temporary Anti-Corrosive Double Layer on Zinc Substrate Based on Chitosan Hydrogel and Epoxy Resin |
| title_full_unstemmed | Temporary Anti-Corrosive Double Layer on Zinc Substrate Based on Chitosan Hydrogel and Epoxy Resin |
| title_short | Temporary Anti-Corrosive Double Layer on Zinc Substrate Based on Chitosan Hydrogel and Epoxy Resin |
| title_sort | temporary anti corrosive double layer on zinc substrate based on chitosan hydrogel and epoxy resin |
| topic | anti-corrosive protection chitosan/epoxy double layer chitosan hydrogel selective peel-off temporary coatings zinc |
| url | https://www.mdpi.com/2310-2861/9/5/361 |
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