Investigations of the corrosion activity of the KAlCl4 melts by the methods of physicochemical analysis

Issue 24(4) 2019
Pages 59-66

E.S. Filatov, The Institute of High Temperature Electrochemistry of the Ural Branch of Russian Academy of Sciences (IHTE UB RAS), Russian Federation, Yekaterinburg

J.F. Gordeeva, Joint stock company «Sverdlovsk Science and Research Institute of Chemical
Engineering»(JSC SverdNIIkhimmash); Ural Federal University named after B.N. Yeltsin, Russian Federation, Yekaterinburg

A.S. Derbyshev, Joint stock company «Sverdlovsk Science and Research Institute of Chemical Engineering»(JSC SverdNIIkhimmash), Russian Federation, Yekaterinburg

V.Ya. Kudyakov, The Institute of High Temperature Electrochemistry of the Ural Branch of Russian Academy of Sciences (IHTE UB RAS), Russian Federation, Yekaterinburg


Keywords: potentiometric, current-voltage, galvanostatic measurements, currents, corrosion rate, frontal corrosion, potential, anodic, cathodic polarization

http://www.doi.org/10.31615/j.corros.prot.2019.94.4-7

 

Corrosion behavior of metal alloys in a melt of potassium chloroaluminate (KAlCl4) was investigated. Metal aluminum was used as a protector for protection against continuous frontal corrosion. The equilibrium potentials of aluminum and the corrosion potential of the alloys were measured. The data were obtained to evaluate the corrosion ability of the system of molten salt of potassium chloroaluminate - gas (argon) by measuring the redox potential of the specified environment depending on the composition of the gas atmosphere above it, i.e. from impurities of water vapor, hydrochloric acid, oxygen and other, for example, carbonaceous gases. The calculations of the protection efficiency using the potential difference between the metal aluminum and the protected material were performed. The regularities of changes in the equilibrium potentials of aluminum from the temperature and concentration were established as the fundamental data for possible use at determining the composition ratio of potassium chlorides and aluminum in potassium chloroaluminate as input data for the development of a sensor of composition of chloroaluminate potassium.