A Brief Overview on the Anticorrosion Performances of Sol-Gel Zeolite Coatings

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.

Processing of high-grade zeolite nanocomposites from solid fuel combustion by-products as critical raw materials substitutes

“…Sol-gel composite zeolite coatings have been studied as anti-corrosion coatings due to the extended specific surface area of zeolites, their molecular storage capacity and selective permeability and internal pore volume in combination with their excellent thermal stability and chemical resistance [31]. On the one hand, the zeolite coatings are an environmental compatible alternative to conventional chromate protective coatings, but from the other À their reliable protective ability will contribute to the saving CRMs, as many of them are components in metal alloys and steels.…”

“…Sol-gel in situ deposition of zeolite films is a proven technology for processing of coatings with good adhesion with metal substrates and effective binding of layer to support interface [31,32]. Zeolites nanoparticles can be used as anti-corrosive protectors by incorporating them as fillers in polymer matrixes, so called composite zeolite coatings, acting as nano-containers hosting corrosion inhibitors [31,33]. However, CFAZ layers can be considered as nanocomposites themselves because of the dispersion of metal oxides in their structural frameworks.…”

“…Further, the zeolite nanocomposite layers can be doped with antimicrobial, inhibitor and healing substances due to their ion-exchange and adsorption ability for improvement of their protective functionalities [31]. CFAZ nanocomposites possess the advantages of micro-mesoporous materials and can host molecules with variety of sizes.…”

Assessment of high performanceSAPO‐34/S‐PEEKcomposite coatings for adsorption heat pumps

“…The composite zeolite‐binder coating technology is a promising approach to deposit an adsorbent layer on the heat exchanger component 1,9–11 . Early studies on this topic were focused on the preparation of silica gel or zeolite‐based coatings employing different inorganic or organic binders 12,13 .…”

Synthesis and Characterization of Crystalline NaY-Zeolite from Belitung Kaolin as Catalyst for n-Hexadecane Cracking

“…Zeolite, one type of tectosilicate group from alumina silicate family [1,2], has played an important role for more than 100 years in the chemical industry, and is widely used in various fields such as water purification [3,4], adsorption, separation, anticorrosion [5] and catalysis processes [6]. Furthermore, Zeolite Y, a member of Faujasite (FAU) framework has long been used as a catalyst in cracking reaction for crude petroleum to more valuable gasoline, diesel and many products [7].…”