High-Temperature Corrosion Behavior of Bi3.75La0.25Ti3O12 and Bi3La1Ti3O12 Coating Prepared by rf Magnetron Sputtering

Abstract

Using the rf magnetron sputtering technique, Bi3.75La0.25Ti3O12 and Bi3La1Ti3O12 coatings were formed and obtained as a thin film on Hastelloy substrates. When subjected to high-temperature conditions, the effect of lanthanum on the anti-corrosive properties of the coatings was investigated. The anti-corrosive response was evaluated by electrochemical impedance spectroscopy and potentiodynamic curves, which are rarely reported. Hot corrosion occurs through the electrochemical mechanism, and more information can be obtained through electrochemical corrosion tests, which are very effective and fast. The electrochemical behavior at high temperatures was studied via molten salt corrosion tests, potentiodynamic polarization curves, and electrochemical impedance spectroscopy. Additionally, the coatings were evaluated via scanning electron microscopy and transmission microscopy to determine their morphology. With X-ray diffraction, the crystallinity of the films was determined. It was determined that the corrosion rate directly correlates with the temperature, attributed to the mechanisms induced by the Na2SO4 and V2O5 salts that generated condensation. As the temperature increases, the density of the corrosion current increases in the thin films of Bi3.75La0.25Ti3O12 and Bi3La1Ti3O12. When comparing the two compounds, it is determined that the increase in lanthanum alters the positive acid character, thus reducing the dissolution of the oxides and increasing protection.

Enhancing Corrosion Resistance of Anodic Oxide Films through Zirconium and Titanium Salts Composite Sealing Process: An Optimization and Morphological Study

“…When the concentration of titanium salt is 6.0 g/L, the self-corrosion potential of the oxide film reaches the maximum value of −0.775 V. The higher the self-corrosion potential is, the higher the corrosion resistance of the oxide film is. This exchange current density was obtained with the intersection of the cathodic Tafel slope and the oxygen reduction reaction (ORR) potential, leading to a current density value associated with the current exchange density [28]. In all the evaluated cases, it was determined that a general dissolution exists in the anodic region.…”

“…Response surface methodology (RSM) is a statistical method that uses reasonable experimental design methods and obtains specific data through experiments, uses multiple quadratic regression equations to fit the functional relationship between factors and response values, seeks the optimal process parameters through the analysis of regression equations, and solves multivariable problems. It can reflect the coupling interaction of multiple factors on the experimental results and makes up for the shortcomings of the orthogonal optimization method [26][27][28][29].…”