3 wt% NaCl 수용액에서 알루미늄과 스테인리스강의 부식에 따른 광 반사 거동

Abstract

The photo-reflectance of aluminum and AISI 304 stainless steel during cyclic immersion test in 3 wt%NaCl solution was examined in this study. Overall, corrosion was not recognized by a visual inspectionor weight measurement up to 310 h. When evaluated, it was noted that the roughness of the specimensdid not change significantly. However, localized corrosion, which is located at the vicinity of intermetallicprecipitation of aluminum or at the grain boundary of stainless steel, was confirmed by the use of an opticalmicroscope and scanning electron microscopy after tens of hours of utilizing the corrosion test. In this respect,an increase of the peak intensity for metallic Al after 90 h of test, and for metallic Fe after 153 h wasdetected from the X-ray photoelectron spectra. In this context, it was shown that from the photo-reflectancespectra, the reflection of the visible light from the tested samples was changed noticeably over the testduration. As a result, the intensity of reflected light was decreased up to 90 h ~ 153 h, and thereafterwas shown to increase higher than the initial intensity before the corrosion test.