철강생산의 수세공정에서 강의 부식에 관한 전기화학적 연구
DC Field | Value | Language |
---|---|---|
dc.contributor.author | 李善用 | - |
dc.date.accessioned | 2017-02-22T07:06:39Z | - |
dc.date.available | 2017-02-22T07:06:39Z | - |
dc.date.issued | 2002 | - |
dc.date.submitted | 56797-10-27 | - |
dc.identifier.uri | http://kmou.dcollection.net/jsp/common/DcLoOrgPer.jsp?sItemId=000002174034 | ko_KR |
dc.identifier.uri | http://repository.kmou.ac.kr/handle/2014.oak/10279 | - |
dc.description.abstract | The objective of this research is to develop a method to prevent, so-called rinsing rust, in pickling and oiling line (POL) in a steel manufacturing company. In this company, a cascade type rinsing system has been adopted to remove residual acid remaining on the strip after pickling. Although it has shown effective rinsing capability under normal operating condition, rinsing rusts (spray burns) are evident on the strip as the line occur slow downed and stopped. Since the cost down due to rusting is significant(around $80.00/ton), it is necessary to develop a system which will prevent the rusting during rinsing. First of all in this study, major operation conditions of the existing system were analyzed. The major problem in the existing rinsing system was identified as high acidity of the rinsing solution. Temperature of rinsing solution is 60~65℃, and its pH is 1.5~4. Because rusting is a corrosion process, corrosion behavior of hot rolled strips was investigated. Exposure tests were conducted under the same conditions as the rinsing system (60℃ HCl solution : pH 1.5~4) up to 200 seconds. As the acidity of solution increased, corrosion became severe. This phenomenon could be attributed to fast cathodic reaction of hydrogen evolution at low pH(high acidity). To resolve this low pH problem, the neutralization of rinsing solution by NaOH was considered. The results showed that when pH of solution is higher than 6, corrosion became moderate up to 100 seconds of exposure. | - |
dc.description.tableofcontents | 목차 Abstract 1. 서론 = 1 2. 이론적 배경 = 3 2.1 금속의 부식 = 3 2.1.1 부식의 발생 = 3 2.1.2 부식 메카니즘 = 6 (1) 전위(potential) = 6 (2) 전위-pH도 = 11 (3) 분극(Polarization) = 16 2.2 수세공정(Rinse system) = 17 2.2.1 원리 = 17 2.2.2 구조 = 17 2.2.3 폭포식(Cascade) 수세공정 = 21 2.3 수세공정에서 부식(Rinsing rust) = 25 2.3.1 수세라인에서 부식반응 = 26 2.3.2 염산용액에서 강의 부식반응 = 26 3. 실험방?? = 35 3.1 실험용액조건 = 35 3.2 시편종류 = 35 3.3 시편제작 및 실험방법 = 38 3.3.1 부식표면 측정 = 42 3.3.2 분극곡선 측정 = 42 4. 실험결과 및 고찰 = 46 4.1 수세공정조건에서의 부식실험 고찰 = 46 4.2 수세공정조건 변화에 따른 부식실험 고찰 = 78 4.2.1 pH변화에 따른 부식거동 = 78 4.2.2 용존산소 및 온도에 따른 부식거동 = 91 5. 결론 = 106 참고문헌 = 108 | - |
dc.publisher | 한국해양대학교 | - |
dc.title | 철강생산의 수세공정에서 강의 부식에 관한 전기화학적 연구 | - |
dc.title.alternative | An Electrochemical Study on Corrosion Behaviors of Steel in Rinsing System of Steel Production | - |
dc.type | Thesis | - |
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