한국해양대학교

Detailed Information

Metadata Downloads

철강생산의 수세공정에서 강의 부식에 관한 전기화학적 연구

Title
철강생산의 수세공정에서 강의 부식에 관한 전기화학적 연구
Alternative Title
An Electrochemical Study on Corrosion Behaviors of Steel in Rinsing System of Steel Production
Author(s)
李善用
Publication Year
2002
Publisher
한국해양대학교
URI
http://kmou.dcollection.net/jsp/common/DcLoOrgPer.jsp?sItemId=000002174034
http://repository.kmou.ac.kr/handle/2014.oak/10279
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.
Appears in Collections:
재료공학과 > Thesis
Files in This Item:
000002174034.pdf Download

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

Browse