A Study of Corrosion Resistance Improvement for Cr-Mo Steel in Long Term Service

장기간 사용한 Cr-Mo강의 내식성 향상 방법에 관한 연구

  • Jin, Yeung-Jun (Department of Aeronautical & Mechanical Design Engineering, Chungju National University)
  • 진영준 (충주대학교 항공.기계설계학과)
  • Published : 2006.06.30

Abstract

It is no wonder that mechanical structures are accompanied by problems related to corrosion after being exposed to long hours of work. Corrosion of mechanical structures has been the most serious problem in the field of industry. The present study employed a laser beam irradiation test to improve the corrosion resistance of degraded Cr-Mo steel, which was used for more than 60,000 hours. To find the optimum irradiation test condition for the corrosion resistance of degraded Cr-Mo steel, hardness and residual stress measurements, micro-structural observation, and the electrochemical potentiokinetic reactivation (EPR) tests were performed with changes in laser beam test conditions including laser beam output, diameter, and velocity. Thus, the present study indicates that the optimum test condition and absorption energy for a laser beam test need to be determined to enhance corrosion resistance of degraded Cr-Mo steel.

Keywords

degraded material;corrosion resistance;laser beam;EPR test

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