Abstract
Steel alloys corrosion is ubiquitous and is conventionally protected by anticorrosion chromate coatings. However, the process suffers from the release of carcinogenic hexavalent chromium ions that needs to be replaced by an ecofriendly alternative. In this context, the need for the development of satisfactory ecofriendly chromium-free coating with superior corrosion performance is highly desirable. In the present study, we synthesized fully dispersible nanocrystalline Beta zeolite seeds and coated on steel alloys followed by steaming. The samples were characterized by XRD, FE-SEM, and DLS analyses. The anticorrosion behavior of the synthesized nanoparticle coatings on steel alloys was investigated by electrochemical measurements (DC polarization) and electrochemical impedance spectroscopy (EIS) in NaCl and acid and alkaline media under identical experimental conditions. The present study demonstrated that the nanozeolite coating can be a potential alternative for toxic and carcinogenic chromate coating.
Highlights
Metal corrosion is inevitable and can be controlled and managed
The present study aims at preparing Beta zeolite thin film on carbon steel by dry gel conversion method and to explore the anticorrosion protection of nanocrystalline zeolite coated carbon steel in aqueous solution
In order to synthesize nanocrystalline Beta zeolite, a hydrolysed clear sol of TEAOH-aluminium isopropoxide (AlP)-TEOS-H2O was prepared at room temperature
Summary
Metal corrosion is inevitable and can be controlled and managed. There are direct and indirect expenses due to corrosion control. A chromium-free technology with superior corrosion performance is highly desirable In this context, there is obviously a need for more environmentally friendly corrosion-resistant coating materials such as polymers and inorganic materials. Recent advances in nanotechnology have provided a variety of options for novel coatings capable of preventing or reducing corrosion [13] It has been demonstrated recently in the literature that a dense coating of zeolite offers a remarkable corrosion resistance for steel and aluminum alloys [14,15,16,17]. The present study aims at preparing Beta zeolite thin film on carbon steel by dry gel conversion method and to explore the anticorrosion protection of nanocrystalline zeolite coated carbon steel in aqueous solution
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