The paper presents the results of laboratory studies of corrosion-abrasive wear of a screw dissolver made of duplex steel 1.4462 in an environment simulating potassium chloride production conditions (4RU of JSC "Belaruskali"). The influence of mechanical impurities (abrasive), temperature (105 °C), pH (4-8), artificial air supply, and incomplete immersion mode was experimentally studied. It has been established that the presence of abrasive increases the mass loss rate by 10 times (up to 0,015 g/day) compared to purely chemical corrosion [2]. The most intense pitting damage is observed in areas with oxygen access. An alkaline environment (pH= 8) promotes the formation of protective deposits, while an acidic one (pH= 4–7) intensifies corrosion [7]. Equipment operation with incomplete immersion of the agitator increases the corrosion rate by 40 % [2, 9]. Duplex steel 1.4462 shows high resistance to chemical corrosion, but its service life is sharply reduced under the combined influence of abrasive and non-standard operating conditions [2, 20]. Practical recommendations for extending equipment service life are given.