Investigation on the inhibition synergism of new generations of phosphate-based anticorrosion pigments

Synthesis and characterization of a new generation of inhibitive pigment based on zinc acetate/benzotriazole: Solution phase and coating phase studies

“…Several physical and/or chemical modifications are performed on the zinc phosphate pigment to enhance its solubility as well as inhibitive action. These resulted in development of second and third generations of the zinc phosphates [12][13][14][15][16][17][18][19][20]. However, most of the zinc phosphate based pigments could not provide long term inhibitive role in the organic coatings.…”

Electrochemical investigation of the epoxy nanocomposites containing MnAl2O4 and CoAl2O4 nanopigments applied on the aluminum alloy 1050

“…These pigments can release corrosion inhibitive species into the solution, restricting the access of the aggressive agents to the active anodic and cathodic sites on the metal surface. [14][15][16][17][18] Sitaram et al 19 studied the use of conducting polymers, i.e., polyaniline, as corrosion inhibitors. They showed that these materials are proper substitutes for conventional anticorrosion materials.…”

“…The released ions can reach the coating/metal interface and restrict the aggressive ions access to the active sites of the metal surface. [16][17][18] The electrolyte diffusion into the aluminum surface is responsible for the increase of pH especially around intermetallic particles as a result of the following cathodic reaction: 2H 2 O þ O 2 þ 2e4OH À . Therefore, the inhibitive species could react with OH À ions and form insoluble compounds on the aluminum surface blocking the active sites.…”

Influence of novel ammonium-modified zinc-free phosphate nanofillers on anticorrosive features of primer-less polyurethane top-coating compositions

“…Anticorrosive efficiency of the mentioned fillers (in relation to the zinc phosphates) is a result of a type of polymeric binder, auxiliary fillers addition as well as investigation method, e.g., electrochemical measurements of fillers aqueous extracts or filled coatings, accelerated tests in salt spray, condensation or Kesternich chambers, immersion tests, outdoor exposition. Generally, it could be claimed that various phosphates containing Zn and Al, 4,5,13,14 Sr, 19 Fe, 4,12,14 or Ca 6 belong to the most attractive corrosion inhibiting additives. A positive influence of Ca cations on aluminum zinc phosphate efficacy was described in the literature.…”

“…However, due to lately revealed negative influence of these fillers on aquatic life, various zinc phosphates, pyrophosphates, and phosphosilicates modified with Li, 1 Na, 2 Mg, 3 Al, [3][4][5][6][7][8][9][10][11][12][13][14] K, 15 Ca, 3,6,16 Fe, 4,12,14 Sr, 6,[17][18][19] and/or Mo 4,6,14,20 were developed and investigated in solventborne, low-VOC, and waterthinnable coating compositions. Additionally, many types of zinc-free derivatives of phosphorus-based acids and ammonium and/or Al, 5,[7][8][9]15,16 Mg, 18 Ca, 3,10,13,16 Cr, Mn, 16 Sr, 5,10,13,17,19,21 Ba, 15,…”