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1 – 1 of 1Aleksandr Georgievich Tyurin, Dmitriy Andreevich Manannikov, Vladimir Pavlovich Parshukov, Anna Valeryevna Antonova and Pavel Anatolyevich Nikolaychuk
The purpose of this study is to develop a method of thermodynamic and kinetic evaluation of corrosion properties of alloys.
Abstract
Purpose
The purpose of this study is to develop a method of thermodynamic and kinetic evaluation of corrosion properties of alloys.
Design/methodology/approach
Method of estimation of corrosion-electrochemical behaviour of multicomponent alloys is proposed. The method takes into account both thermodynamic and kinetic data and is based on mutual construction of equilibrium and polarization potential – pH diagrams. The usage of the proposed method is illustrated in the example of the structural steel 20KT.
Findings
Passivation of steel 20KT is determined by formation of oxide film based on magnetite (Fe3O4); silicon, manganese and copper oxides as well as manganese sulphides can be locally included into the inner side of the passivation layer. An experimental potential – pH diagram of steel 20KT is constructed. Interpreting the results of polarization measurements revealed good agreement between equilibrium and polarization potential – pH diagrams.
Originality/value
It is shown in the example of structural steel 20KT that for interpretation of experimental potential – pH diagrams, one should compare them with corresponding equilibrium diagrams for multicomponent alloys rather than with Pourbaix diagrams for pure metals. The corrosion properties of steel 20KT are estimated using equilibrium and polarization potential – pH diagrams.
Details