Solgel coatings has been implemented and is far from

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sol–gel coatings, has been implemented and is far from being established. The present situation demands further research and innovation efforts to guarantee the success of the application of OIH sol–gel coatings as metal corrosion protection. Future and research challenges on organic– inorganic hybrid materials for corrosion protection Nowadays, metal corrosion protection is strongly reliant on organic and organic–inorganic coating tech- nology, as it is a cost-effective mean of providing practical protection against corrosion for easily corrodible metallic structures and objects. The quality and effectiveness of corrosion control by coatings is assumed by many users to be low cost and easy to achieve. For these reasons, the users of corrosion control coatings often choose these by cost and appearance and not by cost effectiveness, which can be measured by their performance and the lifetime of their behavior. However, with high labor costs and the difficulties found in recoating large, buried, complex or difficult to reach objects, more coatings users are focusing on the total costs of corrosion prevention and control. A coating system that increases the lifetime of the product but is somewhat more expensive, due to the initial application method, will pay for itself in reduced maintenance costs and reduced need for expensive recoating. Following this line of thought, the cost analysis of the corrosion protection provided by coatings must lead to further research into measur- ing and predicting the pot life of the protective properties of these materials. It is undeniable that future applications and research should be focused primarily on the investigation of more environmentally friendly precursors and indus- trial colloid particles to replace the traditional precur- sors in the formation of sol–gel protective coatings without changing their general properties. Among the most critical constraints identified are the coating’s mechanic strength and good adhesion to metallic substrates. In spite of the large number of papers published on this subject, no work was found reporting the use of OIH coatings to stop and prevent corrosion on already damaged substrates as well as studies testing such materials for significant periods of time. The evaluation of whether OIH coatings have the ability to minimize/ stop damage caused by corrosion and their durability over time is of extreme importance since OIHs are known for having a limited shelf life due to sluggish condensation reaction kinetics. The products devel- oped for the protection of metallic substrates against corrosion must have a long lifetime. Another conclu- sion of the detailed analysis of the large set of publications was that studies on the barrier properties of the coatings over time were not found. Therefore, a 0 1 2 3 4 5 6 7 8 9 10 0 1 2 3 4 5 6 7 8 9 10 C o Zn O Au S C Zn O Au Zn Au AI Si Zn Au a b c Fig. 15: (a) SEM image of HDGS samples coated with three layers of OIH by dip-coating method; (b) and (c) show EDS
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  • Fall '19
  • 1984, oIh, OIH coatings

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