Intelligent Nanocoatings for Corrosion Protection of Steels

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dc.contributor.advisorCheng, Frank
dc.contributor.authorFeng, Yuanchao
dc.contributor.committeememberOmanovic, Sasha
dc.contributor.committeememberSong, Hua
dc.contributor.committeememberEgberts, Philip
dc.contributor.committeememberWang, Shenghui
dc.contributor.committeememberCheng, Frank
dc.date.accessioned2017-06-29T20:58:48Z
dc.date.available2017-06-29T20:58:48Z
dc.date.issued2017
dc.date.submitted2017en
dc.description.abstractIntelligent coatings, also called smart coatings, refer to coating systems capable of sensing the generation of corrosive environments, and self-responding to corrosion occurrence in demand. In this research, an intelligent coating technology based on doping of home-prepared nanocontainers pre-loaded with inhibitors- in an epoxy host coating was developed for effective corrosion protection of pipeline steel. The performance of benzotriazole (BTA) inhibitors on preventing corrosion of an X65 pipeline steel was investigated in a bicarbonate solution. A layer of protective inhibitor film with a roughness of nano-meter scale was formed on the steel surface, inhibiting corrosion of the steel. To determine the compatibility of nanocontainers with the host coating, multi-layered Halloysite polyelectrolyte nanocontainers were fabricated and doped in an epoxy coating. The coating containing Halloysite nanocontainers possessed enhanced corrosion resistance. The corrosion resistance of the coating was improved with the increasing content of the Halloysite nanocontainers in the coating. To improve the ability of nanocontainers to encapsulate inhibitors BTA, a SiO2 nanoparticle based polyelectrolyte assembly was prepared as the BTA-encapsulating nanocontainers. At either low or high pH value (e.g., pH 2 or 11), the BTA was released to prevent steel from corrosion in chloride solutions. The Korsemeyer-Peppas model provided an estimation of the inhibitor-releasing rate, which served as the base for prediction of the service life of the intelligent coatings. An intelligent coating was developed by doping the BTA-encapsulated, SiO2 nano-particle-based polyelectrolyte nanocontainers in the epoxy coating. For the pipeline steel coated with the intelligent coatings, the corrosion inhibition was time dependent upon self-releasing of the encapsulated inhibitors from the nanocontainers. With the increasing content of the BTA-encapsulated nanocontainers in the coating, both the coating resistance and corrosion resistance of the steel increase, resulting in a reduced corrosion of the steel. Furthermore, superhydrophobic zinc nano-films were fabricated on X65 pipeline steel. The optimal condition for electrodeposition was under the current density of 100 mA/cm2 for 20 mins. The fabricated superhydrophobic, which had a water contact angle up to 158.4° ± 1.5°, possessed a satisfactory antifouling and self-cleaning ability, and provided an effective corrosion protection to the steel in a chloride solution.en_US
dc.identifier.citationFeng, Y. (2017). Intelligent Nanocoatings for Corrosion Protection of Steels (Doctoral thesis, University of Calgary, Calgary, Canada). Retrieved from https://prism.ucalgary.ca. doi:10.11575/PRISM/26592en_US
dc.identifier.doihttp://dx.doi.org/10.11575/PRISM/26592
dc.identifier.urihttp://hdl.handle.net/11023/3905
dc.language.isoeng
dc.publisher.facultyGraduate Studies
dc.publisher.institutionUniversity of Calgaryen
dc.publisher.placeCalgaryen
dc.rightsUniversity of Calgary graduate students retain copyright ownership and moral rights for their thesis. You may use this material in any way that is permitted by the Copyright Act or through licensing that has been assigned to the document. For uses that are not allowable under copyright legislation or licensing, you are required to seek permission.
dc.subjectEngineering--Chemical
dc.subjectEngineering--Environmental
dc.subjectEngineering--Industrial
dc.subjectMaterials Science
dc.subject.otherIntelligent coatings
dc.subject.otherCorrosion
dc.subject.otherPipeline steel
dc.titleIntelligent Nanocoatings for Corrosion Protection of Steels
dc.typedoctoral thesis
thesis.degree.disciplineMechanical and Manufacturing Engineering
thesis.degree.grantorUniversity of Calgary
thesis.degree.nameDoctor of Philosophy (PhD)
ucalgary.item.requestcopytrue
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