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[I-09] Electrochemical analysis and SEM-EDX characterization of laser-treated weathering steel plate

〇Maoling ZHAO¹, Shigenobu KAINUMA¹, Shusen ZHUANG¹, Muye YANG¹, Manabu HARAGUCHI², Takahiro ASANO³ (1.Kyushu University, 2.TOYOKOH Inc., 3.West Nippon Expressway Company Ltd.)

Keywords:Weathering steel, Electrochemical properties, Laser irradiation, Corrosion resistance, SEM-EDX analysis

Weathering steel (WS) structures are expected to have corrosion resistance. High power laser is a promising technique for surface preparation, with advantages of effective cleaning and environment-friendly. This study reports a comparative study on the electrochemical properties of WS pretreated by continuous wave (CW) laser and milling process, the surface chemical composition was identified by using SEM-EDX analysis. The result shows that corrosion resistance of WS improved after laser irradiation due to oxide layer formed on the surface.