그래핀 함량에 따른 수분산형 에폭시 도막의 방식성능 평가 연구
- Alternative Title
- The study on anti-corrosive performance of water dispersion epoxy coatings containing graphene
- Abstract
- Organic coating is the most basic method to prevent corrosion and cost problems. Especially, solvent borne epoxy coatings are widely used as the primer coatings because of their excellent mechanical and barrier properties. However, most of solvents used in the coatings are VOCs(volatile organic compounds) that are regulated in the world. To replace them, water based systems are increasingly used and emerged in coating market. But water borne epoxy coatings are still less applicable to steel corrosion protection because they have some hydrophilic groups that weaken the barrier property and water resistance. For environmental protection and high utilization of water borne epoxy coatings, they need to overcome shortcomings by using anti-corrosion additives.
In this study, waterborne dispersion epoxy coatings were made into two-pack system and non-functionalized graphene was added into coatings which was used as anti-corrosive nanofiller to prevent corrosive agent, such as water or oxygen, from contacting the underlying metal substrate. Graphene was characterized by Raman spectroscopy and also dispersion solution containing water-surfactant(SDBS) was analyzed by TEM, Z-potential. Electrochemical methods such as OCP, LP, EIS were used to evaluate corrosion resistance performance of the coatings. Also coating surfaces and mechanical properties were examined by SEM, prohesion test and pull-off test.
As a result, water-surfactant solution gives a hydrophobic effect to graphene and separates layer particles. In coatings, graphene induced the barrier property to prevent corrosive agents and also small size graphene particle coating shows better water-corrosion resistance by using electrochemical method. Graphene-epoxy coating’s adhesion strength was not changed, but could delay to generate rust and coating defects by showing barrier effect.
- Issued Date
- 2018
- Awarded Date
- 2018.2
- Type
- Dissertation
- Publisher
- 부경대학교
- Affiliation
- 부경대학교 대학원
- Department
- 대학원 공업화학과
- Advisor
- 박진환
- Table Of Contents
- 1. 서론 1
2. 이론적 배경 4
2.1. 부식의 정의 4
2.2. 방식도막 6
2.2.1. 방식도막의 구성 성분 6
2.2.2. 방식도막에 의한 방식기구 7
2.2.3. 수용성 도료 9
2.2.3.1 수분산형 에폭시 도막 12
2.2.3.2 계면활성제 15
2.3. 탄소 물질 17
2.3.1. 그래핀 19
2.3.2. Exfoliated graphene with surfactant 21
2.4. 전기화학적 방법 24
2.4.1. 분극시험 24
2.4.2. 교류임피던스(Electrochemical Impedance Spectroscopy) 27
2.4.2.1 Equivalent circuit of organic coating 32
2.4.2.2 Bode plot/nyquist plot 35
3. 실험방법 39
3.1. Materials 39
3.2. 시편 준비 41
3.2.1. 그래핀 박리 41
3.2.2. 그래핀-수분산 에폭시 도료 41
3.3. 물성 평가법 43
3.3.1. Raman spectroscopy 43
3.3.2. ELS / Zeta potential 43
3.3.3. TEM(Transmission Electron Microscopy) 43
3.4. 방식성능 평가법 44
3.4.1. 전기화학시험 44
3.4.2. Wet/dry 시험 45
3.5. 도막성능 평가법 46
3.5.1. SEM(Scanning Electron Microscopy) 46
3.5.2. Adhesion test 46
4. 결과 및 고찰 47
4.1. 그래핀 물성 평가 47
4.1.1. Raman spectroscopy 47
4.1.2. ELS / Zeta potential 48
4.1.3. TEM(Transmission Electron Microscopy) 50
4.2. 방식 성능 평가 52
4.2.1. OCP(Open Circuit Potential) 52
4.2.2. Linear Polarization 53
4.2.3. 교류임피던스(Electrochemical Impedance Spectroscopy) 56
4.2.4.Wet/dry 시험 67
4.3. 도막성능 평가 69
4.3.1. SEM(Scanning Electron Microscopy) 69
4.3.2. Adhesion test 72
5. 결론 74
6. 참고문헌 76
- Degree
- Master
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