Mesoporous silica based reservoir for the active protection of mild steel in an aggressive chloride ion environment

Abstract

Spherical mesoporous silica (m-SiO2) with well-ordered pores was synthesized by a modified Stöber method using CTAB micelles.

Mesoporous silica nanoparticles as carriers of active agents for smart anticorrosive organic coatings: a critical review

“…For example, layer-by-layer (LbL) deposition of polyelectrolytes is a largely used approach. 68,[142][143][144][145][146][147][148] Skorb et al 143 developed a pH sensitive polyelectrolyte shell made by a deposition of alternate layers of polyethyleneimine (PEI) and poly(sodium 4-styrenesulfonate) (PSS), enwrapping the corrosion inhibitor 2-(benzothiazol-2-ylsulfanyl)-succinic acid (BYS) into the MSN pores. They also developed a laser-driven release of BTA from MSN coated with the same polyelectrolyte shell.…”

“…They also developed a laser-driven release of BTA from MSN coated with the same polyelectrolyte shell. 142 Shi et al 68 and Siva et al 144 realized a PEI/PSS polyelectrolyte layer, encapsulating the corrosion inhibitor 8-HQ and polyaspartic acid (PAA). Zea et al, [146][147][148] deposited poly(diallyldimethylammonium chloride) (PDDA) pH-responsive polyelectrolyte layers onto HMSN loaded with sodium phosphomolybdate, using sodium chloride (NaCl) to improve the efficiency in the deposition of the polyelectrolyte (Fig.…”

“…Other alkaline pH-responsive nanocontainers were developed exploiting the instability of the bond N-Fe in basic conditions with EBT as corrosion inhibitor, 55 the trigger mechanism of pillararenes to activate the HMAP release 133 and PSS/ PEI layers polyelectrolyte opening system which allows PAA release 144 and BYS. 143 Alkaline ambient sensitive nanoparticles were also showed in another work, where MSN loaded with BTA and covered with PSS/PEI polyelectrolyte layers were developed.…”

“…Anticorrosive coatings may be based on alkyd resins, 5,56,119,152 epoxy resins, [59][60][61]108,113,115,122,149,150,185 eventually modified with amino hardener 51 or mixed with polyamide 68 or silicone, 69 polyesters, 106,123,140 acrylic resins, 141 and polypyrrole. 54,58 Sol-gel coatings are also investigated, obtained by TEOS and derivatives, such as (3-glycidyloxypropyl)trimethoxysilane (GPTMS), 55,129,134,144 eventually functionalized with fluorine-containing monomers, 133 methacryloxypropyltrimethoxysilane (MAPTS), 147,148 or hybrid silane/zirconate coatings. 104,105,114,131,136,142,143,145 Thus, the validation and characterization of these coating systems becomes crucial to critically evaluate the potential beneficial effects of mesoporous silica nanocarriers for anticorrosion applications and thus to identify the most promising perspectives in this still highly scattered research topic.…”

“…Although smart nanocontainers are studied to be theoretically able to prevent corrosion on each kind of metallic substrate, researchers usually projected their systems for specific applications, identifying a metal and characterizing the anticorrosive performances of their smart nanocarriers on specific substrates. Chosen substrates are typically those applied in fields such as aerospace, construction engineering and cultural heritage: several works included tests onto aluminium alloys, 5,51,68,105,113,114,118,120,129,131,136,142,143,145,185 steel, 52,54,55,[57][58][59][60][61]69,104,106,108,122,123,140,144,147,148,149,150,152 copper alloys 52,62,119,141 and magnesium alloys 56,115,124,133,134 (Table…”