METHOD FOR DETERMINING THE STABILITY OF COATINGS AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2018 - IPC G01N25/72 G01N33/42 

FIELD: construction.

SUBSTANCE: invention relates to construction, including road construction, as well as to related areas and directly relates to methods and devices used to determine the stability of coatings used at climatic temperature extremes and effects of deicing agents. Proposed method is carried out at alternate heating-cooling the samples under study, achieved by connecting Peltier modules at the following process parameters: when the number of cooling-heating cycles is at least 2, the voltage on the Peltier modules is 5–12 V, the temperature range is minus 30 °C to plus 30 °C. Determination method is carried out according to the following scheme: samples are being immersed in a container with water or anti-ice reagent and a temperature sensor is being placed there, the container with samples is being insulated, the coolant temperature is set at minus 20 °C – minus 30 °C, then, when connecting the Peltier modules, the temperature operating range is being set, the range is within the minus 30 °C to plus 30 °C, after the specified number of cycles is finished, the control unit is being switched off and the test samples are being compared with the initial samples visually and according to the capillary moisture saturation value. Glass, ceramics, metal, molded concrete products, asphalt concrete samples (cores) with coatings can be used for testing. Apparatus for carrying out this method comprises a flat bottom cryostat made of stainless steel, an internal sample bath made of copper and immersed in an open portion of the cryostat, external bath, coated with a layer of thermal paste and made of copper or stainless steel, also immersed in the cryostat, Peltier modules having a silicone or epoxy coating and evenly distributed throughout the bottom of the external bath on which an internal sample bath is being installed, thermal insulation, installed between the walls of the internal and external baths, a cover with thermal insulation installed on the top of the baths, a thermal sensor inserted in the cover with thermal insulation, a power unit with a voltage regulator.

EFFECT: increased speed of the process of determining the stability of coatings and improved accuracy of the obtained results.

7 cl, 3 dwg, 1 tbl