Abstract
Zeolites are crystalline nanoporous aluminosilicates. Thanks to their intrinsically nanoporous structure they are widely used as molecular sieves, for exchanging ions, or, also thanks to the high surface area of these structures, for catalytic applications. Furthermore, thanks to their thermal and chemical stability, in recent years zeolite coatings have been evaluated for application as anti-corrosion coatings. The non-toxicity of this class of coatings makes it possible that they will be an environmentally friendly alternative to conventional chromate-based coatings. This article provides a brief review of the anti-corrosion performance of zeolite coatings, applied by direct synthesis technique to several metals and alloys, as discussed in the literature. After a short description of the microstructure and properties of zeolites, the discussion addresses the research activities related to this topic, as reported in the literature. Comparative analysis of literature results supported the dry-gel conversion method as a promising approach that combines a simplified synthesis procedure with anti-corrosion coating performance. Based on these considerations, an evaluation of future trends is discussed along with the final remarks.
Highlights
The development of coatings with effective active or functional properties for metallic substrates is a stimulating research topic in the field of zeolites, which could lead to new and innovative prospective applications
The first is focused on zeolite short description the microstructure andrelated properties zeolites, the section discussion is addressed to the coatings obtained by in situ crystallization synthesis, applying hydrothermal, ionothermal, and dryresearch activities, reported in the literature, related to this topic
The present manuscript provided a critical review on anti-corrosion behavior of zeolite coatings obtained by in situ crystallization methods on several metal alloys
Summary
The development of coatings with effective active or functional properties for metallic substrates is a stimulating research topic in the field of zeolites, which could lead to new and innovative prospective applications. In the techniques, grouped in two main families: in situ crystallization coatings and composite zeolite former, a direct synthesis of zeolite in the metal substrate is obtained. In the latter, the zeolite is used coatings. The potential of this deposition technique for obtaining anti-corrosion zeolite coatings is is high, and the experimental results found in the literature are encouraging on this regard. The first is focused on zeolite short description the microstructure andrelated properties zeolites, the section discussion is addressed to the coatings obtained by in situ crystallization synthesis, applying hydrothermal, ionothermal, and dryresearch activities, reported in the literature, related to this topic.
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