METHOD FOR DETERMINING INTEGRITY OF POLYMER COATING, AND DEVICE FOR ITS IMPLEMENTATION

FIELD: measurement equipment.SUBSTANCE: invention relates to a physical and chemical analysis and can be used for determination of available cracks on a surface of specimens of rolled steel with a polymer coating, mainly at bending strength testing of the polymer coating as per GOST R 52146-2003. In the method for determining integrity of the polymer coating, which involves contact of the tested specimen with electrically conducting liquid and measurement of an electrical current, according to the invention, current is formed not from an external power supply, but as a result of occurrence in defective sections of the coating of an active electrode - a metal strip. Besides, a saline solution can be used as an electrically conducting liquid. In order to implement this method, a device for determining integrity of a polymer coating is used, which includes a working element with electrically conducting liquid and a current test instrument, which differs by the fact that the working element is made in the form of an electrolytic cell made from dielectric material, in the lower part of which an electrode is located, which is made from material that is not passivated in the applied electrically conducting liquid, and the upper part of which has a contact element made from plastic corrosion resistant material; with that, the electrolytic cell is equipped with a system of its filling and maintaining the level of a convex meniscus in the contact element and contacts the electrically conducting element. Besides, the electrically conducting element can be made in the form of a metallic shell, an electrode can be made from graphite, and the contact element can be made from resin.EFFECT: creation of a method and a device, which provide for accuracy, objectivity, simplicity and speed of determination of polymer coating integrity.6 cl, 1 dwg, 1 tbl Изобретение относится к области физико-химического анализа и может быть использовано для определения наличия трещин на поверхности образцов стального проката с полимерным покрытием, преимущественно при испытании полимерного покрытия на прочность при изгибе по ГОСТ Р 52146-2003. В способе определения сплошности полимерного покрытия, включающем контакт исследуемого образца с электропроводной жидкостью и измерение электрического тока, согласно изобретению ток образуется не от внешнего источника питания, а в результате появления на дефектных участках покрытия активного электрода - металлической полосы. Кроме того, в качестве элект