Silica mesoporous thin films as containers for benzotriazole for corrosion protection of 2024 aluminium alloys

Structure and corrosion behavior of sputter deposited cerium oxide based coatings with various thickness on Al 2024-T3 alloy substrates

“…However, the presence of intermetallic particles in Al alloys increases their susceptibility to localized corrosion, such as Al Cu Mg particles in Al 2024-T3 and Al 7075-T6 alloys [3,4]. Numerous studies have been conducted to find ways to improve the corrosion resistance of Al alloys using protective coatings [5][6][7][8][9]. Rare earth coatings, including cerium oxide based conversion coatings (CeOCs) deposited from aqueous solutions, have been shown to provide good corrosion resistance for high strength Al alloys [10][11][12][13][14].…”

Ce(III) corrosion inhibitor release from silica and boehmite nanocontainers

“…Organic-inorganic hybrid sol-gel coatings exhibit good barrier properties that hinder the progression of the aggressive species [4][5][6]. Moreover, self-healing properties can be brought to coating thanks to the addition of organic [7,8] or inorganic [7][8][9] corrosion inhibitors. Among alternative inhibitors, rare earth elements and more especially the cerium (III) cation provide an effective corrosion protection to the AA2024-T3 [7,[10][11][12][13][14][15][16].…”

“…Because nanocontainers embedded into coatings also act as fillers which improve the barrier property and in order to assess the inhibitor release property of the nanocontainers, the present work focuses on the study of the Ce(III) release in a corrosive solution. Most of the reported studies involve organic inhibitors whose release from nanocontainers is easily quantified by spectrophotometry [8,39] but few studies dealt with inorganic inhibitors such as lanthanide cations which require other methods such as ICP titration which involves multiple separation steps [40]. Moreover in the case of very small nanoparticles (under 20 nm), the separation of loaded nanoparticles remains a difficult task, (500°C, 5 h) to remove the template, 0.3 g of the powder was dispersed in 50 mL of deionized water by mechanical attrition at 0.1 mol L −1 silicon concentration.…”

Advancement in corrosion resistance of AA 2024-T3 through sol-gel coatings including nanocontainers

“…Nevertheless, this disadvantage can be overcome by the addition of inorganic or organic corrosion inhibitors into the coatings that can provide self-healing properties to sol-gel coatings [6][7][8]. Furthermore, the corrosion inhibitors can be encapsulated into containers before their incorporation into the coatings in order to control the release of inhibitor without loss of the coatings coherence [9][10][11][12][13].…”