Methodological review demonstrates strict boundary conditions and unit conversion rules for Langmuir isotherms, highlighting best practices for corrosion modeling.
The application limits of the Langmuir isotherm are presented, regarding the range of the relative coverage area, as well as the slope of the linearized form of the isotherm. The analysis of the literature data led to the conclusion that, in the case of the adsorption of organic corrosion inhibitors, the coefficient of determination R2 is not an infallible criterion for the eligibility of the type of isotherm, since the Langmuir model is rigorously applicable only for coverage areas of at least 0.8, and the slope should be as close to 1 as possible. It was also found that in order to ensure the accuracy of the results, it is necessary that the concentration distribution in the definition domain of the Langmuir isotherm be as uniform as possible, avoiding a decadal variation. For the graphical representations in which unconventional units of concentration are used, ppm or mg L−1, useful especially in engineering applications, the methods of converting the adsorption constant into units compatible with the dependence relations of the adsorption constant on the thermodynamic state functions, which provide information on the strength of the metal - inhibitor interactions, the thermal effect, as well as the spontaneity of the adsorption process, are given.Finally, since the molar concentration of pure water is temperature dependent, its values at different temperatures are systematically presented.
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Vaszilcsin et al. (2026) studied this question.
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