PREDICTION OF THE DURABILITY OF POLYMER COATINGS IN POTASSIUM ORE PROCESSING MACHINE CONDITIONS

UDC 620,667.6

  • Potapchik Aleksandr Nikolaevich – PhD student, the Department of Polymer Сomposite Materials. Belarusian State Technological University (13a, Sverdlova str., 220006, Minsk, Republic of Belarus). E-mail: alexander.potapchik@mail.ru

  • Egorova Anna Leonidovna – PhD (Engineering), Associate Professor, Assistant Professor, the Department of Polymer Сomposite Materials. Belarusian State Technological University (13a, Sverdlova str., 220006, Minsk, Republic of Belarus). E-mail: a_l_egorova@mail.ru

  • Hryniuk Dzmitry Anatol’yevich – PhD (Engineering), Associate Professor, Assistant Professor, the Department of Automation of Production Processes and Electrical Engineering. Belarusian State Technological University (13a, Sverdlova str., 220006, Minsk, Republic of Belarus). E-mail: hryniuk@tut.by

DOI: https://doi.org/10.52065/2520-2669-2021-247-2-166-174

Key words: polymer coatings, lifetime prediction, coating capacitance, capacitance-frequency ratio, adhesion, impact resistance.

For citation: Potapchik A. N., Egorova A. L., Grinuk D. A. Prediction of the durability of polymer coatings in potassium ore processing machine conditions. Proceedings of BSTU, issue 2, Chemical Engineering, Biotechnologies, Geoecology, 2021, no. 2 (247), pp. 166–174 (In Russian). DOI: https://doi.org/10.52065/2520-2669-2021-247-2-166-174.

Abstract

The aim of the work is to predict the durability of a polymer coatings intended for anticorrosion protection of potassium ore processing machine.

A brief review of methods for studying the anticorrosive efficiency of paint coatings is given, from which it follows that electrochemical properties are the most informative and can be used for both assessing the anticorrosive properties of coatings and calculating their durability. The process of changing the physicomechanical (adhesion and impact resistance) and electrochemical (resistance and capacitance) properties of polymer coatings under the influence of operating factors was investigated.

A method for calculating the durability of polymer coatings is proposed. It is based on determining the value of the capacitance-frequency coefficient at various durations of exposure time to an aggressive environment. An increase in the numerical value of the capacitance-frequency coefficient under the influence of an aggressive environment correlates with the development of the underfilm corrosion process.

The forecast of the durability of five polymer coatings was carried out. It was established that the most durable is the epoxy novolac coating, which is able to provide reliable anti-corrosion protection: the durability under the operating conditions of the Brandes thickener is 13.6 years, the screw mixer – 4.6 years, in case of exposure only to the vapor-air phase, the durability of the coating increases to 44 years.

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