Investigation of shinning Spot Defect on Hot-Dip Galvanized Steel Sheets
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초록
Shinning spot defects on galvanized steel sheets were studied by optical microscope, scanning electronmicroscope(SEM), Energy Dispersive Spectrometer (EDS) and Laser-Induced Breakdown Spectroscopy OriginalPosition Statistic Distribution Analysis (LIBSOPA) in this study. The research shows that the coating thicknessof shinning spot defects which caused by the substrate defect is much lower than normal area, and whenskin passed, the shinning spot defect area can not touch with skin pass roll which result in the surfaceof shinning spot is flat while normal area is rough. The different coating morphologies have different effectson the reflection of light, which cause the shinning spot defects more brighter than normal area.
Abstract
Shinning spot defects on galvanized steel sheets were studied by optical microscope, scanning electronmicroscope(SEM), Energy Dispersive Spectrometer (EDS) and Laser-Induced Breakdown Spectroscopy OriginalPosition Statistic Distribution Analysis (LIBSOPA) in this study. The research shows that the coating thicknessof shinning spot defects which caused by the substrate defect is much lower than normal area, and whenskin passed, the shinning spot defect area can not touch with skin pass roll which result in the surfaceof shinning spot is flat while normal area is rough. The different coating morphologies have different effectson the reflection of light, which cause the shinning spot defects more brighter than normal area.
참고문헌 (6)
- N. Y. Tang, "A study of defects in galvanized coatings", Galvatech 2001, pp.44~ (2001)
- Jin xinyan, "Study of a spot defect caused by flaking of hot-dip galvannealed coating", Baosteel technology, 59, pp.3~ (2008)
- Cheng guoping, "Cause analysis of shinning dots on surface of galvannealed steel sheets after press forming", Baosteel technology, 6, pp.35~ (2003)
- Francis Chen, "An In-depth analysis of various subtle coating defects", Galvatech 2004, pp.1055~ (2004)
- Dong-Soo Han, "Characterization of the tiniest defects for automotive exposed panels", Galvatech 2007, pp.285~ (2007)
- N. Y. Tang, "Coating defects, origin and remedies", Galvanizers association 2001, 93rd Galvanizers association meeting, Portland (2001)