Silica sol–gel anchoring on aluminum pigments surface for corrosion resistance based on aluminum oxidized by hydrogen peroxide

Corrosion resistance of flaky aluminum pigment coated with cerium oxides/hydroxides in chloride and acidic electrolytes

“…It has been shown that surface modification of the aluminum pigment with inorganic coatings could provide a stable corrosion resistance film on its surface protecting it against alkaline and acidic conditions [4,[9][10][11][12][13][14]. The interaction between polymeric corrosion inhibitors and aluminum pigment was studied by Müller et al [6,8].…”

“…According to the literature the surface modification of aluminum pigment can be categorized into three groups of modification with organic materials [1,2,[5][6][7][8], inorganic coating [4,[9][10][11][12][13][14] and organic-inorganic mixed coating [15][16][17][18]. It has been shown that surface modification of the aluminum pigment with inorganic coatings could provide a stable corrosion resistance film on its surface protecting it against alkaline and acidic conditions [4,[9][10][11][12][13][14].…”

The Treatment of Aluminium Pigments with Inorganic Polymers for Environment-Friendly Applications

“…A less toxic alternative is the encapsulation of the aluminium pigment [27], which involves the formation of a polymer protective layer around the aluminium flake [28].…”

Advanced Characterization of Silica–Encapsulated Aluminum Pigments

“…The sol-gel process includes hydrolysis and condensation reactions of different kind of precursors, generating an inorganic network around the aluminum flake [18,19]. Although tetraethylorthosilicate (TEOS) remains the preferred precursor for industrial-scale applications [15], recent works report the formation of a hybrid layer on the aluminum flake surface achieved by using TEOS and γ-aminopropyl triethoxysilane [20], TEOS and poly-methyl methacrylate-butyl acrylate-(3-methacryloxypropyl)-trimethoxysilane [9], or TEOS and polymer brushes [6]. The inorganic framework can be chemically bound to the aluminum flake or the silica can form a shell around the flake, without the formation of chemical bounds.…”

“…The inorganic framework can be chemically bound to the aluminum flake or the silica can form a shell around the flake, without the formation of chemical bounds. It is generally accepted that hydroxy-groups on the aluminum flake surface are the anchoring points for the silica sol-gel film [20,21]. Thus, anchoring agents as H 2 O 2 or copper-ammonia complexes can be used to oxidize the aluminum surface and to form hydroxy moieties.…”