EVALUATION OF PROTECTIVE PROPERTIES OF COATINGS OF FILLED COMPOSITIONS BY ELECTROCHEMICAL METHODS
Sambetbaeva A.K. Kurmanbekova E.B. Shaltabaeva S.T. Ugryumov S.A.
2022National Academy of Sciences of the Republic of Kazakhstan
News of the National Academy of Sciences of the Republic of Kazakhstan, Series of Geology and Technical Sciences
2022#2022Issue 5207 - 218 pp.
This article discusses the possibility of using new chemically resistant fillers from local, non-scarce and inexpensive raw materials. It is known that mineral fillers are characterized by high chemical resistance. At the same time, glass powder has high acid resistance, and expanded clay dust has high acid and alkali resistance. The introduction of fillers into a heat-resistant anticorrosive coating based on ED-16 epoxy resin to protect metal products and structures from corrosion, contributes to improving the technological and operational properties of coatings. It is shown that on a liquid glass binder, with an increase in the dosage of the filler – glass powder, the adhesive strength of coatings and its protective ability increases. When used as a filler of expanded clay dust, on the contrary, with an increase in the dosage of the filler, the adhesive strength of the coatings and its protective ability decrease. The introduction of expanded clay dust improves the electrochemical state of the steel under the coating, and at the same time increases the fire resistance of the coating, which significantly reduces the deformation of the metal when exposed to high temperature (up to 900-950°C). Having a large surface, the fillers come into contact with the functional groups of the polymer, while the adhesion forces are manifested, the nature of which determines the resistance to aging of coatings and the preservation of their protective properties for a long time. The influence of glass powder and expanded clay dust on the adhesive properties and protective ability of coatings has been studied. It is known that visual assessment of the corrosion state of steel samples does not provide accurate information about the further electrochemical state of steel samples under coating. Therefore, electrochemical studies of steel samples protected by anticorrosive coatings have been carried out by removing anodic polarization curves, as well as by measuring the ohmic resistance of coatings. It is concluded that the data obtained by capacitance-ohmic measurement are similar to the data obtained from the anode polarization curves of steel samples protected by anticorrosive coatings. Tests have shown that the greatest displacement of the stationary potential is observed when filling the binder with glass powder, regardless of the type of binder.
anticorrosive coatings , filler , glass powder , metal structures , steel
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International Educational Corporation, Almaty, Kazakhstan
St. Petersburg State Forestry Engineering University named after S.M. Kirov, Saint Petersburg, Russian Federation
International Educational Corporation
St. Petersburg State Forestry Engineering University named after S.M. Kirov
10 лет помогаем публиковать статьи Международный издатель
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