지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 자료유형
- 학위논문
- 저자정보
- 지도교수
- 정찬영
- 발행연도
- 2020
- 저작권
- 동의대학교 논문은 저작권에 의해 보호받습니다.
이용수25
이 논문의 연구 히스토리 (2)
- 이 논문의 후속연구가 궁금하신가요?
- 연관 학술논문 또는 학술발표를 통해 보다 발전된 연구결과를 확인하실 수 있습니다.
- 이 논문의 연구 히스토리 확인하기
초록· 키워드
오류제보하기
발수성 표면은 물로 인해 발생할 수 있는 금속 소재 표면의 오염 및 부식을 억제할 수 있어 다양한 응용 분야에서의 적용이 확장하고 있다. 발수성이란 고체 표면에 물이나 유기 액체가 부착되지 않거나 젖지 않는 특성이다. 일반적으로 발수성이란 액체가 고체 표면에 떨어질 때 표면의 접촉각이 약 90 °이상일 때를 의미하며, 표면의 접촉각이 150 °이상일 때 초발수성 표면이라고 정의한다. 이때 접촉각은 고체와 액체 사이의 장력, 액체의 표면장력, 고체의 표면에너지 및 표면형태에 따라 결정된다.
한편, 초발수성 표면은 최근 자기 세척 (self-cleaning), 방빙 (anti-icing), 유체의 분리 (oil-water separation), 방식 (anti-corrosion) 등 다양한 응용 분야에서 많은 관심을 끌고 있다. 이러한 다양한 특징을 갖는 표면을 제작하기 위해서는마이크로 및/또는 나노 구조를 갖는 기하학적인 구조물의 형상 구현 및 표면 에너지를 제어가 가능한 기능성 코팅을 적용한 발수 표면 처리 기술에 대한 연구가 중요하다.
알루미늄 (Al; Aluminum)과 그 합금은 마그네슘, 타이타늄 등과 함께 경량 금속 소재로써, 우수한 열전도도, 전기전도도 및 훌륭한 기계적 강도 등의 특징을 가지고 있어 항공기, 자동차, 전자 제품 부품뿐 만 아니라 해양 산업에 걸쳐 다양한 분야에서 널리 활용되고 있다. 한편, 알루미늄과 그 합금은 대기보다 혹독한 부식 및 오염 환경에 노출되면 표면 노화, 부식 등 문제가 발생한다. 특히, 알루미늄 합금의 경우 부식에 취약하다는 단점을 가지고 있어 이를 해결하기 위해 초발수성 표면 제작을 위한 다양한 방법이 제시되고 있다.
본 연구는 경량 금속 소재인 알루미늄 5052 합금에 단계적 양극산화 공정을 통해 제작된 계층적 양극산화피막의 초발수성 및 내식성의 향상을 살펴보고자 수행하였다. 단계적 양극산화 공정은 3차 양극산화 공정으로 진행되었으며, 2차와 3차 양극산화를 연질 양극산화(MA; Mild Anodization)와 경질 양극산화(HA; Hard Anodization)를 순차적으로 교차 진행하였다. 2차 양극산화 후 생성된 산화피막에 인산 용액을 이용하여 Pore-widening과정을 10분 단위로 수행하였다. 또한 제작된 시편의 발수성을 부여하기 위해 표면에너지가 낮은 물질인 FDTS 용액을 이용하였다. 양극산화 후, FE-SEM을 활용한 구조물의 단면 및 형상을 분석하였고, 접촉각 측정 장치를 활용하여 발수특성을, NaCl을 통한 전기화학적 분극 실험을 활용하여 내식성을 통해 피막의 특성을 고찰하였다.
한편, 초발수성 표면은 최근 자기 세척 (self-cleaning), 방빙 (anti-icing), 유체의 분리 (oil-water separation), 방식 (anti-corrosion) 등 다양한 응용 분야에서 많은 관심을 끌고 있다. 이러한 다양한 특징을 갖는 표면을 제작하기 위해서는마이크로 및/또는 나노 구조를 갖는 기하학적인 구조물의 형상 구현 및 표면 에너지를 제어가 가능한 기능성 코팅을 적용한 발수 표면 처리 기술에 대한 연구가 중요하다.
알루미늄 (Al; Aluminum)과 그 합금은 마그네슘, 타이타늄 등과 함께 경량 금속 소재로써, 우수한 열전도도, 전기전도도 및 훌륭한 기계적 강도 등의 특징을 가지고 있어 항공기, 자동차, 전자 제품 부품뿐 만 아니라 해양 산업에 걸쳐 다양한 분야에서 널리 활용되고 있다. 한편, 알루미늄과 그 합금은 대기보다 혹독한 부식 및 오염 환경에 노출되면 표면 노화, 부식 등 문제가 발생한다. 특히, 알루미늄 합금의 경우 부식에 취약하다는 단점을 가지고 있어 이를 해결하기 위해 초발수성 표면 제작을 위한 다양한 방법이 제시되고 있다.
본 연구는 경량 금속 소재인 알루미늄 5052 합금에 단계적 양극산화 공정을 통해 제작된 계층적 양극산화피막의 초발수성 및 내식성의 향상을 살펴보고자 수행하였다. 단계적 양극산화 공정은 3차 양극산화 공정으로 진행되었으며, 2차와 3차 양극산화를 연질 양극산화(MA; Mild Anodization)와 경질 양극산화(HA; Hard Anodization)를 순차적으로 교차 진행하였다. 2차 양극산화 후 생성된 산화피막에 인산 용액을 이용하여 Pore-widening과정을 10분 단위로 수행하였다. 또한 제작된 시편의 발수성을 부여하기 위해 표면에너지가 낮은 물질인 FDTS 용액을 이용하였다. 양극산화 후, FE-SEM을 활용한 구조물의 단면 및 형상을 분석하였고, 접촉각 측정 장치를 활용하여 발수특성을, NaCl을 통한 전기화학적 분극 실험을 활용하여 내식성을 통해 피막의 특성을 고찰하였다.
목차
List of Tables ··················································································· ⅴList of Figures ················································································· ⅵⅠ. 서 론 ····························································································· 1Ⅱ. 이론적 배경2.1 양극산화 알루미늄 ····································································· 32.1.1 알루미늄 ·············································································· 32.1.2 양극산화 알루미늄 ···························································· 42.2 금속의 부식 ··················································································· 92.3.1 금속의 부식과 부식손실 ·················································· 92.3.1 알루미늄의 부식 거동 특성 ·········································· 102.3 초발수성 표면 및 접촉각 ························································· 112.3.1 초발수성 표면 ·································································· 112.3.2 Young의 이론식 ······························································· 132.3.3 Wenzel의 이론식 ······························································· 142.3.4 Cassie-Baxter의 이론식 ···················································· 15Ⅲ. 양극산화 알루미늄 합금의 성장 거동3.1 서론 ······························································································· 163.2 실험방법 ························································································· 183.3 측정방법 ······················································································· 193.4 표면형상 분석 ············································································· 203.5 EDS 분석 ······················································································ 24Ⅳ. 초발수성 알루미늄 양극산화피막 제작 및 내식성연구4.1 서론 ································································································· 264.2 실험방법 ························································································· 284.3 측정방법 ························································································· 304.4 표면형상 분석 ··············································································· 314.4.1 Fabrication Approach ······················································ 314.4.2 인가전압에 따른 표면형상 ·············································· 344.4.3 기공확장 시간에 따른 표면형상 ···································· 374.5 젖음성 분석 ··················································································· 404.6 내식성 분석 ··················································································· 44Ⅴ. 결 론 ···························································································· 48참고문헌 ································································································ 50영문초록(Abstract) ·········································································· 55
최근 본 자료
댓글(0)
0