An in-depth comprehension of the protection mechanism of Al alloys by aniline-based silane

Preparation, characterization and application of a novel silane-bridged polyaniline/cotton fiber composite

“…When 0.2 mol/L NH 3 was added, the grafting ratio was further increased to 8.7%. In the meanwhile, a large amount of white precipitate was produced in the solution, which was suggested to be due to the self-condensation of TMSPA producing insoluble siloxane network (Si-O-Si) in alkaline solution [21][22][23]. For HAc, a different phenomenon was presented.…”

“…Different from traditional silica-based materials [6], silane modification of cellulose seems more difficult, and the chemical grafting resulted from condensation reactions between silane OH groups and cellulose OH groups occurs only at high temperature (e.g., above 100 C) [18][19][20][21][22]. Besides, other parameters like medium pH, silane concentration, amounts of water and catalyst also affect the condensation reactions and the consequent silane grafting ratios significantly [19][20][21][22][23].…”

Semiconducting and electrical properties of thin hybrid films from pyrrolyl- and anilynyl-silicon precursors

“…Anilynyl-and pyrrolyl-silicon derivatives (Fig. 1) as precursors of hybrid films to protect Al alloys against corrosion in chloride containing solutions have been widely investigated by our group [1][2][3][4][5][6][7][8][9]. Films with transparent appearance and thicknesses of 2-5 μm are typically obtained by direct-to-metal surface treatment with hydrolyzed methanol-based solutions of PySi and AnSi.…”

“…Films with transparent appearance and thicknesses of 2-5 μm are typically obtained by direct-to-metal surface treatment with hydrolyzed methanol-based solutions of PySi and AnSi. The hybrid films behave as "reservoir" (polysiloxane chains) of a "corrosion inhibitor" (aniline or pyrrole moieties), which acts against metal substrate degradation as siloxane linkages fail by back hydrolysis [1][2][3][4][5].…”

“…Electropolymerization on inert substrates leads to hybrid films with mixed n-p doping behavior regardless the extent of hydrolysis [7][8][9], indicating that OH-π donor-acceptor complexes and the charge pinning action on pyrrole (Py) ring by silanol (SiOH) are preserved in the hybrid network. OH-π interactions are less effective with the more basic AnSi, which promotes deprotonation and self-condensation of SiOH [3][4][5]8,9]. The p-type redox behavior of electrogrown films involves anion and proton exchange [8,9], as typically obtained for polyaniline and derivatives [10,11].…”