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An intrinsically conducting polymer-...
~
Yu, Qifeng.
An intrinsically conducting polymer-based coating system for corrosion protection of steels.
紀錄類型:
書目-語言資料,手稿 : Monograph/item
正題名/作者:
An intrinsically conducting polymer-based coating system for corrosion protection of steels./
作者:
Yu, Qifeng.
面頁冊數:
1 online resource (224 pages)
附註:
Source: Dissertation Abstracts International, Volume: 78-07(E), Section: B.
標題:
Civil engineering. -
電子資源:
click for full text (PQDT)
ISBN:
9781369653717
An intrinsically conducting polymer-based coating system for corrosion protection of steels.
Yu, Qifeng.
An intrinsically conducting polymer-based coating system for corrosion protection of steels.
- 1 online resource (224 pages)
Source: Dissertation Abstracts International, Volume: 78-07(E), Section: B.
Thesis (Ph.D.)--Illinois Institute of Technology, 2017.
Includes bibliographical references
Among the various corrosion protection strategies for structural steels, coating techniques provide the most cost-effective protection and have been used as the primary mode for corrosion protection. Existing coating techniques have been used mainly for their barrier capability and all have a limited service life. In this research work, a waterborne two-strand polyaniline: poly (acrylic acid) complex was synthesized and utilized to fabricate the primer layer of a two-layer coating system. The techniques of Scanning Kelvin Probe Force Microscopy (SKPFM) and Electrochemical Impedance Spectroscopy (EIS) were used to evaluate the anti-corrosion capability of the polymeric complex when mixed in an epoxy matrix and coated on steel samples as the primer layer. The evaluation results show that coating systems including a PANi-based primer has measurable anti-corrosion capability and the anti-corrosion capability of PANi-based primer depends on the usage of PANi and the type of matrix material of the primer layer.
Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2018
Mode of access: World Wide Web
ISBN: 9781369653717Subjects--Topical Terms:
561339
Civil engineering.
Index Terms--Genre/Form:
554714
Electronic books.
An intrinsically conducting polymer-based coating system for corrosion protection of steels.
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Source: Dissertation Abstracts International, Volume: 78-07(E), Section: B.
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Adviser: Tongyan Pan.
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Thesis (Ph.D.)--Illinois Institute of Technology, 2017.
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Includes bibliographical references
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Among the various corrosion protection strategies for structural steels, coating techniques provide the most cost-effective protection and have been used as the primary mode for corrosion protection. Existing coating techniques have been used mainly for their barrier capability and all have a limited service life. In this research work, a waterborne two-strand polyaniline: poly (acrylic acid) complex was synthesized and utilized to fabricate the primer layer of a two-layer coating system. The techniques of Scanning Kelvin Probe Force Microscopy (SKPFM) and Electrochemical Impedance Spectroscopy (EIS) were used to evaluate the anti-corrosion capability of the polymeric complex when mixed in an epoxy matrix and coated on steel samples as the primer layer. The evaluation results show that coating systems including a PANi-based primer has measurable anti-corrosion capability and the anti-corrosion capability of PANi-based primer depends on the usage of PANi and the type of matrix material of the primer layer.
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In the laboratory condition, a prototype two-layer coating system including the PANi-based primer and a polyurethane topcoat was manufactured. The ASTM Salt-Spray Test and EIS were used to prove the anti-corrosion performance of the prototype using a two-layer, polyurethane-over-epoxy system (no PANi) as the control system. After the proof of concept, a non-waterborne epoxy was used to fabricate a different PANi-based primer. The two types of primers and two other commercial primers (a zinc-rich primer and an epoxy-only primer) were used to make a total of eight two-layer coating systems using two widely used topcoats. Salt-Spray Test, Cyclic Salt Fog/UV Exposure Test, Pull-Off Adhesion Test, and the techniques of EIS, SKPFM, and Scanning Electron Microscope (SEM) were used to evaluate the long-term performance of the eight systems. Based on the laboratory-based recommendations, a total of six groups of two-layer coating systems were then subjected to the outdoor-exposure test to evaluate their anti-corrosion durability at two testing sites. The field durability of the coating systems was evaluated in terms of their surface gloss reduction, color change, adhesion change and surface deteriorations.
520
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The matrix material in which the PANi is mixed plays an important role in the long-term anti-corrosion performance of coatings. The waterborne epoxy is effective in dispersing PANi nano-particles and has zero VOC; however, it does not bond to the steel surface as strongly as the regular non-waterborne epoxy. The topcoat material also plays an important role in the long-term anti-corrosion performance of coatings; polyurethane has higher durability than epoxy as a topcoat material. The PANi-based systems possess long-term corrosion protection comparable to the performance of the conventional zinc-rich three-layer system based on the one-year field evaluation.
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Ann Arbor, Mich. :
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2018
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Mode of access: World Wide Web
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http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10244465
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click for full text (PQDT)
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