DEVICE FOR DETERMINING SPECIFIC ELECTRICAL RESISTANCE OF PAINT COATING IN ELECTROLYTE Russian patent published in 2024 - IPC G01R27/02 

FIELD: measurement.

SUBSTANCE: invention relates to protection of metal products from corrosion and can be used to determine specific electrical resistance of paint coating under conditions of action of electrolyte – mineral fertilizer solution. Device contains a test cell and a galvanic cell filled with electrolyte, a capacitor, a switch, a digital multimeter with a high-resistance input resistance and a three-position switch. Test cell includes a plastic cup without a bottom attached to a paint coating on a steel plate, and a graphite electrode. Galvanic cell includes plastic cup, graphite and steel electrodes. Multimeter and the three-position switch are used to measure the reference voltage on the electrodes of the galvanic cell and to measure the voltage drop at the input resistance of the multimeter when it is connected to the galvanic cell and the test cell connected to it. Specific electrical resistance of the paint coating is calculated by the formula taking into account the input resistance of the multimeter, the thickness of the coating and the area of its contact with the electrolyte, reference voltage and voltage drop at the input resistance.

EFFECT: possibility of determining specific electrical resistance of a paint coating in a high-resistance range using a low-voltage device which is safe for the electrical strength of the coating during its testing for long-term exposure to electrolyte.

1 cl, 3 dwg