DEVELOPMENT OF A METHOD FOR PREDICTING THE DURABILITY OF ANTICORROSIVE PAINT COATINGS

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

DOI: https://doi.org/10.52065/2520-2669-2021-247-2-175-186

Key words: polymer coatings, prediction of durability, coating capacity, capacitance-frequency coefficient, adhesion, underfilm corrosion.

For citation: : Potapchik A. N., Egorova A. L. Development of a method for predicting the durability of anticorrosive paint coatings. Proceedings of BSTU, issue 2, Chemical Engineering, Biotechnologies, Geoecology, 2021, no. 2 (247), pp. 175–186 (In Russian). DOI: https://doi.org/10.52065/2520-2669-2021-247-2-175-186.

Abstract

The aim of this work is to develop a method for calculating the durability of anticorrosive paint coatings operated under the influence of electrolytes at normal and elevated temperatures.

The regularities of the change in the nature of the frequency dependence of the capacitance under the influence of electrolytes are studied and it is shown that the increase in capacitance occurs first in at low AC frequencies, and then, under the effect of electrolytes, changes can be revealed at higher AC frequencies. It was experimentally confirmed that at AC frequencies more than 2 000 000 Hz, the capacitance values of a significantly damaged coating are practically indistinguishable from the capacitance values of an intact coating.

A calculation method of the capacitance-frequency coefficient is proposed. It is shown that the graphical dependence of the capacitance-frequency coefficient on the exposure time has three stages: an initial decrease or slowed growth, active growth and stabilization. It was experimentally confirmed that under the coating at the end of the second stage occurs active corrosion process. The values of the capacitancefrequency coefficient at this time depend on the chemical nature of the coating and the peculiarities of its adhesive interaction with the metal substrate and can be used as failure criteria for calculating the durability.

The type of dependence, which determines the relationship between the value of the capacitivefrequency coefficient and the time of exposure to an aggressive environment is established. The algorithm for calculating the durability of coatings is proposed. An example of calculating the durability of a polyester coating in a saturated aqueous solution of NaCl and KCl at a temperature of 107°С is given.

Download

References

  1. GOST 9.072–2017. Unified system of corrosion and ageing protection. Paint coatings. Terms and definitions. Moscow, Standartinform Publ., 2020. 36 p. (In Russian).
  2. Karyakina M. I. Ispytaniye lakokrasochnykh materialov i pokrytiy [Testing of paints and coatings]. Moscow, Khimiya Publ., 1988. 272 p.
  3. Rozenfel’d I. L., Rubinshteyn F. I. Antikorrozionnye gruntovki i ingibirovannye lakokrasochnye pokrytiya [Anticorrosion primers and inhibited coatings]. Moscow, Khimiya Publ., 1980. 200 p.
  4. Sorokov A. V., Stepin S. N., Kayumov A. A., Sitnov S. A., Kuznecova O. P. Methods for assessing the anticorrosive effectiveness of paint coatings. Vestnik Kazanskogo tekhnologicheskogo universiteta [Bulletin of the Kazan Technological University], 2012, vol. 15, no. 24, pp. 68–75 (In Russian).
  5. J. Ross Macdonald. Impedance Spectroscopy. Theory, Experiment, and Applications. John Wiley & Sons, 2005. 595 с.
  6. Golovin V. A., Dobriyan S. A. Electrochemical and electrophysical methods of non-destructive testing of protective polymer coatings. Corrosion: materials, protection, 2020, no. 12, pp. 1–13. DOI: 10.31044/1813-7016-2020-0-12-1-13.
  7. Xuwen Liu, Jinping Xiong, Uongwu Lv, Yu Zuo. Study on corrosion electrochemical behavior of several different coating systems by EIS. Progress in Organic Coatings, 2009, vol. 64 (4), pp. 497–503. DOI: 10.1016/j.porgcoat.2008.08.012.
  8. GOST 9.409–88. Unified system of corrosion and ageing protection. Paint coatings. General requirements and methods of accelerated tests on resistance to the influence of climatic factors. Moscow, Izdatel’stvo standartov, 1988. 17 p. (In Russian).
  9. GOST 9.042–75. Unified system of corrosion and ageing protection. Inhibited polymer coatings. Accelerated corrosion test methods. Moscow, Izdatel’stvo standartov, 1977. 18 p. (In Russian).
  10. Bakirova E. V., Agayan B. S., Varagina T. V., Korol’chenko I. A., Grechanovskiy I. K. Sposob prognozirovaniya dolgovechnosti promyshlennykh protivokorrozionnykh lakokrasochnykh pokrytiy dlya metallicheskikh poverkhnostey [A method for predicting the durability of industrial anticorrosive coatings for metal surfaces]. Patent RF, no. 2520164, 2014.
  11. Kendig M., Scully J. Basic aspects of electrochemical impedance application for the life prediction of organic coating on metals. Corrosion, 1990, no. 46, pp. 22–29. DOI: 10.5006/1.3585061.
  12. Scully J., Hensley S. Life time prediction for organic coating on steel and a magnesium alloy using electrochemical impedance methods. Corrosion, 1994, no. 50, pp. 705–716. DOI: 10.5006/1.3293547.
  13. Shreepathi S., Guin A. K., Naik S. M., Vattipalli M. R. Service life prediction of organic coatings: electrochemical impedance spectroscopy vs actual service life. Journal of Coatings Technology and Research, 2011, vol. 8 (2), pp. 191–200. DOI: 10.1007/s11998-010-9299-5.
  14. Kutyrev A. E., Karimova S. A., Pavlovskaya T. G., Kuzin Ya. S. Investigation of the degradation of properties of protective combined coatings on aluminum alloys in order to develop methods for predicting their service life. Aviatsionnyye materialy i tekhnologii [Aviation materials and technologies], 2015, no. 3 (36), pp. 69–78 (In Russian).
  15. Franky Bedoya-Lora, Angela Bermudez, Juan Gastano, Felix Echeverria. Electrochemical impedance study for modeling the anticorrosive performance of coatings based on accelerated tests and outdoor exposures. Journal of Coatings Technology and Research, 2016, vol. 13 (5), pp. 895–904. DOI: 10.1007/s11998-016-9803-7.
  16. GOST 32299–2013 Paint materials. Pull-off test for adhesion. Moscow, Standartinform Publ., 2014. 12 p. (In Russian).
12.05.2021