The characterisation and performance of Ce(dbp)3-inhibited epoxy coatings

Mardel, J.; Garcia, Santiago J.; Corrigan, P.; Markley, T.; Hughés, A.E.; Muster, Tim H.; Lau, D.; Harvey, T. G.; Glenn, A.M.; White, P. A.; Hardin, Simon G.; Luo, Chen; Zhou, Xiaorong; Thompson, G.E.; Mol, J.M.C.

doi:10.1016/j.porgcoat.2010.10.009

Cited by 77 publications

(46 citation statements)

References 57 publications

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“…Furthermore, several organic compounds, including benzotriazole, dibutylphosphate, and 2-mercaptobenzothiazole, and combinations with the inorganic inhibitors demonstrated corrosion inhibition on AA2024-T3. [33][34][35][36][37] A new paradigm of chromate-free corrosion protection was the introduction of magnesium metal as sacrificial anode in a coating. 38,39 Magnesium-rich primer (MgRP) technology provides cathodic protection to the aluminum alloy by galvanic coupling of the metallic magnesium pigment and the aluminum alloy.…”

Section: Introductionmentioning

confidence: 99%

Lithium salts as leachable corrosion inhibitors and potential replacement for hexavalent chromium in organic coatings for the protection of aluminum alloys

et al. 2016

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Lithium salts are being investigated as leachable corrosion inhibitor and potential replacement for hexavalent chromium in organic coatings. Model coatings loaded with lithium carbonate or lithium oxalate demonstrated active corrosion inhibition and the formation of a protective layer in a damaged area during neutral salt spray exposure. The present paper provides an abridged overview of the initial studies into this novel inhibitor technology for the active corrosion protection of aluminum alloys. Coating defects were investigated by microscopic techniques before and after exposure to corrosive conditions. Scanning electron microscopy analysis of cross-sections of the coating defect area demonstrated that the protective layer comprises a typical threelayered structure, which included a dense layer near the alloy surface, a porous middle layer, and a flakeshaped out layer. Potentiodynamic polarization measurements obtained with a microcapillary cell positioned in the coating defect area and electrochemical impedance spectroscopy confirmed the corrosion protective properties of these protective layers. The longterm corrosion inhibition of the lithium-based coating technology was tested in industrial coating systems.

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Section: Introductionmentioning

confidence: 99%

Lithium salts as leachable corrosion inhibitors and potential replacement for hexavalent chromium in organic coatings for the protection of aluminum alloys

et al. 2016

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“…Figure 5a-d all show an oxide at the interface, which is the anodised coating. S was detected in this layer, presumably due to the incorporation of SO 4 2− ions from the anodising process ( Figure 5c) [57].…”

Section: Sem/edsmentioning

confidence: 99%

“…The Li 2 CO 3 contained alkali metals (Na, K) in the range 400-800 ppm by weight. Particle size distributions for these additives were determined by dispersing in a solvent, which was methylethylketone for Mg-(hydr)oxide, TiO 2 and Li 2 CO 3 , where water was used for the BaSO 4 . The BaSO 4 particles had the largest particles (up to 50 µm) and the largest spread in particles size.…”

Section: Materials and Sample Preparationmentioning

confidence: 99%

“…Many new inhibitor systems have been the subject of extensive research, including rare earths [1][2][3][4][5][6][7][8][9][10][11][12][13][14], vanadates [15,16], organic compounds [17][18][19][20][21][22][23], sacrificial particles or functional properties in coatings [24][25][26][27][28], double-layered hydroxides containing inhibitors [29][30][31][32][33][34][35][36][37][38][39][40][41] and, in many cases, combinations of these. The search for alternatives is probably most intense for aerospace applications, where chromate inhibitors have been the mainstay of corrosion prevention for many decades.…”

Section: Introductionmentioning

confidence: 99%

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Particle Characterisation and Depletion of Li2CO3 Inhibitor in a Polyurethane Coating

et al. 2017

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The distribution and chemical composition of inorganic components of a corrosion-inhibiting primer based on polyurethane is determined using a range of characterisation techniques. The primer consists of a Li 2 CO 3 inhibitor phase, along with other inorganic phases including TiO 2 , BaSO 4 and Mg-(hydr)oxide. The characterisation techniques included particle induced X-ray and γ-ray emission spectroscopies (PIXE and PIGE, respectively) on a nuclear microprobe, as well as SEM/EDS hyperspectral mapping. Of the techniques used, only PIGE was able to directly map the Li distribution, although the distribution of Li 2 CO 3 particles could be inferred from SEM through using backscatter contrast and EDS. Characterisation was also performed on a primer coating that had undergone leaching in a neutral salt spray test for 500 h. Overall, it was found that Li 2 CO 3 leaching resulted in a uniform depletion zone near the surface, but also much deeper local depletion, which is thought to be due to the dissolution of clusters of Li 2 CO 3 particles that were connected to the external surface/electrolyte interface.

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“…There is some evidence to suggest that initial high release of inhibitors may be facilitated through atmospheric exposure of the intact paint where penetration of water into the film "prepares" the inhibitor, probably via surface hydrolysis reactions, within the paint, for diffusion and release into the defect (Du, Damron et al 2001;Furman, Scholes et al 2006;Scholes, Furman et al 2006;Souto, González-García et al 2010). The presence of water in the film allows soluble inhibitor species to be released into the paint system and diffuse to the metal/coating interface to provide in-situ corrosion prevention or repair called pre-emptive healing (Mardel, Garcia et al 2011) (Zin, Howard et al 1998;Osborne, Blohowiak et al 2001). Thus it has been demonstrated that water can trigger cerium dibuthylphosphate (Ce(dbp) 3 ) release into an epoxy matrix resulting in improved adhesion and resistance to filiform corrosion attack through interfacial modification (Mardel, Garcia et al).…”

Section: Corrosion and Protectionmentioning

confidence: 99%