METHOD FOR CONDUCTING CORROSION RESISTANCE TESTS Russian patent published in 2022 - IPC G01N17/00 

FIELD: corrosion protection.

SUBSTANCE: invention relates to the study of anticorrosive properties of materials and their resistance to aggressive environments and can be used in the development of measures for anticorrosive protection of equipment in the oil, gas, petrochemical and other industries. The method for conducting the corrosion resistance test includes the preparation of test samples, their degreasing, weighing on scales, purging with inert gas of a sealed container with test samples installed in it and a separate sealed container with a test solution, pumping the test solution into a container with test samples, holding in a test environment, after which the samples are removed from the container, cleaned from the corrosion products, weighed again and the corrosion rate is calculated based on the change in the mass of the samples before and after the test. At the same time, before the first weighing, the degreased samples are dried at a temperature of 40 to 50°C for 10-15 minutes and kept in a desiccator over calcined calcium chloride or silica gel for at least 24 hours. The installation of samples in the container is carried out in such a way that the wide faces are in a vertical position, and the samples do not come into contact with each other and with the walls of the container. The number of samples tested in one container should be determined in such a way that there is at least 30 ml of solution per 1 cm² of the sample area. Inert gas purging is carried out for at least 1 hour with a gas supply rate of at least 100 ml/min per 1 liter of the test container. A 5% sodium chloride solution saturated with hydrogen sulfide (H₂S) in the amount of 350-650 mg/l or carbon dioxide (CO₂) in the amount of 600-900 mg/l is used as a test medium; the temperature of the test solution is 21-25°C. The tests are carried out for 95-97 hours without interruptions.

EFFECT: ensuring the possibility of improving the accuracy of determining and predicting the corrosion resistance of steel and cast iron to continuous (general) corrosion of model media containing hydrogen sulfide and carbon dioxide.

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