1 the quick evolution of this specific research area

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trations within the coating layer. 1 The quick evolution of this specific research area and the potential contribution of sol–gel coatings as a corrosion inhibi- tion system for metal substrates has led to several review publications. 2 , 3 As alternatives to the use of chromate for corrosion protection of aluminum aero- space alloys, 4 the use of sol–gel-derived coatings for improved corrosion resistance of aluminum and steel metal surfaces 5 , 6 and magnesium alloys 7 had also been debated. OIHs obtained by sol–gel methods are a new generation of multifunctional materials with a broad spectrum of useful properties and a diversity of application potential. The name itself indicates the presence of both organic and inorganic components within the common matrix support. The inorganic part is formed from silicon or transition metal alkoxides via hydrolysis, while the organic part could be based on a diversity of molecules, and depending on how the matrix structure is produced, they can be segments of a quasi-continuous macromolecular domains grafting or bonding the inorganic skeleton. These two components (hydrophilic oxides and hydrophobic organic mole- cules) are normally difficult to combine within the composite network, and to achieve the interaction between them special reaction conditions must be applied. The sol–gel OIH coatings are complex matrices where the intermolecular interactions between the macromolecular existing structures and metallic sur- face are extremely relevant to material properties, like low porosity and rigidity and adhesion to substrate. The conjugation of these interactions results in mate- rials with enhanced protective properties against oxi- dation, corrosion, erosion, and good thermal and electrical insulation properties. Another technological advantage of these materials arises from their ability to be produced at room temperature conditions on an industrial scale using well established and low-cost methods like spray, dip and spin coating, flow coating, J. Coat. Technol. Res.
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roll coating, doctor blading, and capillary coating processes or using any combination thereof. 8 Alto- gether, the reagents involved to produce such matrices have very low environmental impacts. The tested corrosion protection processes and materials based on sol–gel technology demonstrate positive perfor- mances when several properties are considered, such as corrosion resistance, adhesion, fatigue resistance, reli- ability, and quality control. Although some of the possible alternatives demonstrate promise for corro- sion protection, continuous efforts are being made in improving the production of OIH materials with improved properties, the understanding of the mech- anisms involved in coating production and conse- quently their corrosion protection performance.
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  • Fall '19
  • 1984, oIh, OIH coatings

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