다양한 코팅기술이 적용된 탄소강의 기계적 가공에 따른 부식저항성 연구
Investigation on Corrosion Resistance of Carbon Steel with Various Coating Technologies Under Mechanical Processing
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This study compared and analyzed the electrochemical properties of the galfan+Top coating, which demonstrated excellent corrosion resistance in previous research, against the widely used gal- valume+Cr3+coating during bending processes (U type). Results from the potentiodynamic polarization experiment showed that the corrosion current densities for the galfan+Top-coated specimen and the gal- valume+Cr3+-coated specimen were 0.041 and 0.081 µA/cm², respectively, indicating that the galfan+Top coating exhibited superior corrosion resistance. However, the corrosion resistance trends observed through 3D microscopy, SEM surface analysis and EDS analysis did not align with the results from the potentio- dynamic polarization experiment. This discrepancy was attributed to the transpassive behavior of the gal- fan+Top-coated specimen, where the current density increased from –0.407 V until the end of the potentiodynamic polarization experiment, which was not seen in the galvalume+Cr3+-coated specimen. After conducting the galvanostatic corrosion experiment, minimal differences in corrosion resistance were noted through SEM surface analysis and EDS analysis. Nevertheless, 3D microscopy analysis revealed less surface damage on the galfan+Top-coated specimen compared to the galvalume+Cr3+-coated specimen, highlighting a difference in corrosion resistance.
Abstract
This study compared and analyzed the electrochemical properties of the galfan+Top coating, which demonstrated excellent corrosion resistance in previous research, against the widely used gal- valume+Cr3+coating during bending processes (U type). Results from the potentiodynamic polarization experiment showed that the corrosion current densities for the galfan+Top-coated specimen and the gal- valume+Cr3+-coated specimen were 0.041 and 0.081 µA/cm², respectively, indicating that the galfan+Top coating exhibited superior corrosion resistance. However, the corrosion resistance trends observed through 3D microscopy, SEM surface analysis and EDS analysis did not align with the results from the potentio- dynamic polarization experiment. This discrepancy was attributed to the transpassive behavior of the gal- fan+Top-coated specimen, where the current density increased from –0.407 V until the end of the potentiodynamic polarization experiment, which was not seen in the galvalume+Cr3+-coated specimen. After conducting the galvanostatic corrosion experiment, minimal differences in corrosion resistance were noted through SEM surface analysis and EDS analysis. Nevertheless, 3D microscopy analysis revealed less surface damage on the galfan+Top-coated specimen compared to the galvalume+Cr3+-coated specimen, highlighting a difference in corrosion resistance.
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