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- 저자 : Aarti Gautam (검색결과 1 건)
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Aarti Gautam,K. R. C. Soma Raju,K. V. Gobi,R. Subasri 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.10
Autonomous healing coatings based on encapsulation of corrosion inhibitors into nanocontainers is gaining a lot of attention. In the present work, coating formulations based on hybrid organic–inorganic sol–gel coatings impregnated with chrome-free corrosion inhibitors such as Zr4+ (Z) and various rare-earth elements (RE: Ce3+, La3+, Gd3+, Er3+) were investigated on mild steel substrates. Effects for both the direct addition of corrosion inhibitor (Z/RE) into the matrix sol and the addition of halloysite nanoclay encapsulated corrosion inhibitor (Z/RE-H) were evaluated. To evaluate the coating performance and self-healing action of different corrosion inhibitors, various characterization techniques such as potentiodynamic polarization studies, electrochemical impedance spectroscopy, micro-Raman spectroscopy, salt spray test and scanning electron microscopy-elemental analysis were used. Electrochemical studies and salt spray tests clearly confirm that coatings derived from a direct addition of corrosion inhibitors to the matrix sol result in an excellent performance. The current densities of coatings based on direct addition of Zr4+ and Ce3+ were very low, in the order of 10–10 and 10–9 A/cm2, respectively, when compared to other RE and all Z/RE-H coatings, which exhibited a current density of 10–6 A/cm2. Micro-Raman analysis confirmed the self-healing action of zirconium and cerium-based coatings.
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