Abstract
Research activity concerning nanoporous zeolites has grown considerably in recent decades. The structural porosity of zeolites provides versatile functional properties such as molecular selectivity, ion and molecule storage capacity, high surface area, and pore volume which combined with excellent thermal and chemical stability can extend its application fields in several industrial sectors. In such a context, anti-corrosion zeolite coatings are an emerging technology able to offer a reliable high performing and environmental friendly alternative to conventional chromate-based protective coatings. In this article, a focused overview on anti-corrosion performances of sol-gel composite zeolite coatings is provided. The topic of this review is addressed to assess the barrier and self-healing properties of composite zeolite coating. Based on results available in the literature, a property–structure relationship of this class of composites is proposed summarizing, furthermore, the competing anti-corrosion active and passive protective mechanisms involved during coating degradation. Eventually, a brief summary and a future trend evaluation is also reported.
Highlights
One of the widely used cost-effective methods for corrosion protection of metallic substrates is to apply surface engineering coatings [1]
The results indicated that the zeolite coating approach could be directly extended to other metal or composite substrates [50]
Rassouli and coworkers assessed the active corrosion protection performances of epoxy ester coating filled with zeolite nanoparticles with zinc [68] or combined organic and inorganic inhibitors [69]
Summary
One of the widely used cost-effective methods for corrosion protection of metallic substrates is to apply surface engineering coatings [1]. Several micro- and nano-capsules were proposed in order to host green inhibitors for corrosion protection of coatings, including bentonite [16], montmorillonite [17], hydroxyapatites [18], carbon, or alloysite nanotubes [19] This approach applied on clay nano-containers filled with Ce (III) ions provides significant corrosion inhibition and ability to delay cathodic delamination; the effect being superior to that of chromate-based coatings [3]. (iv) to limit accidental inhibitor release, (v) corrosion selectivity, and (vi) on-demand release of the hosted inhibitor [24] In such a context, a really promising approach that in the last year was acquiring significant relevance and that allows a potentially reliable coating design, is the use of zeolite as filler and micro-container for inhibitor species encapsulation [25] favoring self-healing mechanisms in this class of new smart coatings [26,27]. The final purpose is to give, on the basis of an overview of the state of the art in such a context, a rational and structured reference focused on innovations and development perspectives of this coating technology, highlighting, the limits and the issues related to its usage in industrial applications
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