Abstract
Corrosion is constantly a major problem of the world economy in the field of metal products, metal processing and other areas that utilise metals. Previously used compounds utilizing hexavalent chromium were amongst the most effective materials for corrosion protection but regulations have been recently introduced that forbid their use. Consequently, there is a huge drive by engineers, technologists and scientists from different disciplines focused on searching a new, more effective and environmentally-friendly means of corrosion protection. One novel group of materials with the potential to solve metal protection problems are sol-gel thin films, which are increasingly interesting as mitigation corrosion barriers. These environmentally-friendly and easy-to-obtain coatings have the promise to be an effective alternative to hexavalent chromium compounds using for anti-corrosion industrial coatings. In this review the authors present a range of different solutions for slow down the corrosion processes of metallic substrates by using the oxides and doped oxides obtained by the sol-gel method. Examples of techniques used to the sol-gel coating examinations, in terms of anti-corrosion protection, are also presented.
Highlights
There is a wealth of published data providing information regarding the activation, functionalization and protection of metallic surfaces [1,2,3,4,5,6,7,8,9,10,11]
For the purpose of protecting a substrate from corrosion as well as obtaining suitable mechanical resistance of the surface layer, organic-inorganic coatings, doped with corrosion inhibitors obtained by the sol-gel method are commonly used, as they are characterised by high potential in this respect [1,7,8,46]
Another very useful technique used in surface treatment characterization, as well as in the Another very useful technique used in surface treatment characterization, as well as in the analysis analysis of the chemical of thin is treatment scanning electron microscopy is a Another very usefulcomposition technique used in films, surface characterization, as (Figure well as7)
Summary
There is a wealth of published data providing information regarding the activation, functionalization and protection of metallic surfaces [1,2,3,4,5,6,7,8,9,10,11]. Such surface modifications are always associated with the need to adapt the surface properties of metallic substrates to a working environment or conditions without a radical change in the metallic material itself. SiO sol-gel coatings, paying special attention to different modifications of matrices (Figure 1). Of SiO22 sol-gel coatings, paying special attention to different modifications of SiO22 matrices SiO22 hybrid hybridoxide oxidecoatings coatingsonon alloy substrates other oxide matrices on alloy substrates, as
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