LAUSR

Abstract For the first time, Feldspar (F) nanocontainer, which is a group of rock-forming tectosilicate minerals with the chemical composition of KAlSi3O8-NaAlSi3O8-CaAl2Si2O8, was used for the construction of an epoxy composite coating with superior barrier and self-healing anti-corrosion performance. Feldspar (F) based nanocontainer with robust corrosion inhibitive activity was fabricated through the encapsulation of zinc cations as a cathodic inhibitor. It was understood from the electrochemical measurements that in the saline solution including F/Zn extract the metal corrosion was significantly retarded (by protection efficiency of 73%) due to the inhibitor release activity of the F/Zn container and protective film generation on the metal surface. The inductively coupled plasma (ICP) analysis results confirmed the Zn2+ cations (5.33 mg/L) release in the chloride solution from the F/Zn container. EIS test results evidenced the significant effect of the F/Zn in the epoxy ester composite coating barrier and self-healing anti-corrosion functions in the intact and scratched forms. In the presence of F/Zn an improvement in the charge transfer resistance (about 83%) of the scratched coating was observed, indicating the active self-healing inhibition effect of the F/Zn nanocarrier. By incorporation of the F/Zn particles into the epoxy ester coating the E′ (at 30 °C), glass transition temperature (Tg), stress, strain and energy at break were significantly enhanced. These results proved that not only the corrosion protection properties but also the mechanical properties of the epoxy ester coating were excellently improved in the presence of F/Zn nanocarrier.