Abstract
Currently the most promising approach in the corrosion protection by smart coatings is the use of nanoreservoirs loaded with corrosion inhibitors. Nanocontainers are filled with anti-corrosive agents and embedded into a primer coating. Future prospective containers are halloysite nanotubes due to their low price, availability, durability, with high mechanical strength and biocompatibility. The aim of this work is to study the use of halloysite nanotubes as nanocontainers for encapsulated dodecylamine for active corrosion protection of carbon steel. Halloysite clay was characterized by XRD and TGA- thermogravimetric analysis techniques. Halloysite nanotubes were loaded with dodecylamine and embedded into an alkyd primer with a weight ratio of 10 wt.% . The anticorrosive performance of the alkyd primer doped with 10 wt.% of entrapped-dodecylamine halloysite was tested on coated carbon steel by direct exposure of the coated samples with a provoked defect into 0.01 mol/L NaCl corrosive media using electrochemical impedance spectroscopy (EIS) and scanning vibrating electrode technique (SVET). EIS and SVET measurements showed the self-healing properties of the doped alkyd coating. Coated samples were also evaluated in a salt spray chamber and the self-healing effect was unequivocally noticed.
Highlights
Corrosion of metals is one of the serious technological problems, resulting in huge economic losses, especially in the aerospace, automotive, and petroleum industries
The X-ray diffraction (XRD) studies showed that the halloysite sample contain other types of minerals as alunite, quartz, kaolinite, and gibbsite, which may have affected the performance of the halloysite
Thermogravimetric curves indicated more than one simple step for the release and/or degradation of dodecylamine from halloysite structure
Summary
Corrosion of metals is one of the serious technological problems, resulting in huge economic losses, especially in the aerospace, automotive, and petroleum industries. For this reason, a variety of methods such as cathodic protection, metallic coatings, and polymeric coating systems were developed to overcome it. Nanocontainers are loaded with corrosion inhibitors and dispersed in organic coatings applied as primers. These nanomaterials have the ability to release encapsulated inhibitors in a controlled manner, which can be tuned to coincide with an increase of the aggressiveness
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