Release of lanthanum cations loaded into piperazine-modified SBA-15 to inhibit the mild steel corrosion

The lanthanum cations loaded into piperazine-modified SBA-15 was synthesized in three steps, and it was utilized as nanocontainers for inorganic corrosion inhibitor. The N-2 adsorption-desorption analysis revealed that the lanthanum ions were loaded into the nanochannels due to the reduction of pore diameter, pore volume, and specific surface area. EDS evaluations proved that lanthanum ions were successfully encapsulated into the nanotubes up to 13 wt %. The ICP results confirmed the release of lanthanum ions up to 7 ppm during 24 h. The Polarization and EIS analysis revealed the considerable inhibition effect of lanthanum cations doped into SBA-15. La3+-loaded nanoreservoirs were incorporated in an epoxy-silicone coating. The vertical bar Z vertical bar(0.01) Hz of specimens with scratched coating, including the La-loaded SBA-15, was about 2 and 5 times superior to that of neat coated samples after 1 and 24 h, respectively. The EIS assessments demonstrated the active protection of the coating incorporating La-loaded SBA-15. The EDS investigation indicated the release of lanthanum cations in the defect zone.

Automated summary

The study successfully synthesized lanthanum cations loaded into piperazine-modified SBA-15 as nanocontainers for inorganic corrosion inhibitors. By reducing the pore diameter, volume, and specific surface area, lanthanum ions were encapsulated into nanotubes up to 13 wt %. EIS assessments demonstrated the active protection of the coating incorporating La-loaded SBA-15, with EDS investigation showing the release of lanthanum cations in the defect zone.