Analyzing cut-edge corrosion in hot dip galvanized and Zn-Al-Mg alloy using image processing

Abstract

Currently, hot-dip galvanized steel is widely used because of its ability to provide effective corrosion resistance at a relatively low cost. However, there is a growing demand for materials that can enhance the corrosion resistance while maintaining the coating thickness, particularly in harsh environments. The development of Zn-Al-Mg alloys aims to address this need by improving the corrosion resistance of Zn coatings. The Zn-Al-Mg alloy is designed to offer enhanced protection against corrosion, even in vulnerable areas, such as the cut-edge region, where traditional zinc coatings may be weaker. To precisely assess the protective capability, the specimens were subjected to cyclic corrosion tests. The cut-edge area was meticulously observed using scanning electron microscopy and energy-dispersive X-ray spectroscopy. Additionally, advanced image processing techniques were employed to determine the detectability and extent of corrosion in the cut-edge area. This comprehensive evaluation aims to provide valuable insights into the effectiveness of Zn-Al-Mg alloy coatings in enhancing corrosion resistance and to inform better material selection for applications in harsh environments.