INVESTIGATION OF 4-METHYLCYCLOHEXANONE OXIME INHIBITOR ACTIVITY AGAINST LOCAL CORROSION

The corrosion properties of steel grade Steel 20 in the NACE environment with the addition of hydrogen sulfide and carbon dioxide were studied, the local corrosion rate in relation to the «pure metal» and in the case of corrosion inhibitors based on imidazolines and 4-methylcyclohexanone oxime was estimated. Based on the results of the work, it can be concluded that steel grade Steel 20 does not have high corrosion resistance in the NACE formation water model, the general corrosion rate over the entire exposure time interval is > 0.1 mm/year, local corrosion damage is present, the local corrosion rate is > 2.4 mm/year. The use of inhibitors of both the imidazoline type and based on 4-methylcyclohexanone oxime makes it possible to reduce the general corrosion rate to values not exceeding 0.4 and 0.2 mm/year, respectively (at an exposure time of 720 h), and reduce the local corrosion rate by at least 10 and 20 times, respectively.