Investigate the Effect of Blasting Materials on the Adhesion and Corrosion Protection Performance of Fusion Bonded Epoxy Coated Steel in NaCl Medium

In the present study, a complete evaluation was performed to assess the effect of blasting steel with various grit materials during surface preparation on the surface characteristics and corrosion protection behavior of FBE coatings. Blasting was executed with different constituents such as steel, sand, granite and glass beads to pretreat the hot-rolled steel, and the subsequent surface microstructure, interfacial adhesion bonding and surface protective performance against corrosion were analyzed using different techniques. Surface characterization studies revealed that the different blasting materials highly influenced surface roughness, and the highest roughness of about 40 mu m was gained using sandblasting. Adhesion test results for the coatings with steel blasted specimens confirmed the improved adhesion strength by showing the highest adhesion strength of 44% compared to the coating on untreated specimens. Corrosion test results corroborated that scratched FBE coatings with blasted specimens exhibited the highest corrosion protection performance compared to that of FBE coatings with the bare surface by displaying higher impedance values (4.44 x 10(5) omega cm(2)), a nobler shift in corrosion potential (- 0.4134 V versus SCE) and lowest corrosion current density (1.97 x 10(-8) A/cm(2)) after immersion of 15 days in NaCl solution.

Automated summary

A comprehensive evaluation was conducted to investigate the impact of blasting steel with different materials on the surface characteristics and corrosion protection behavior of FBE coatings. The results showed that the choice of blasting material significantly influenced the surface roughness, with sandblasting achieving the highest roughness of 40 μm. The adhesion test results indicated that coating with steel blasted specimens had the highest adhesion strength of 44%, and the corrosion test results confirmed that FBE coatings with blasted specimens exhibited superior corrosion protection performance.