To increase the durability of reinforced concrete products it is important to determine the period of termination of the steel reinforcement protection with concrete coating, and develop ways to increase the corrosion resistance of concrete in environments with a high degree of corrosion. We enter 0.3-1.3 wt. % of calcium stearate into the cement mixture at the stage of sample preparation to ensure volumetric hydrophobization of cement brick. Also we treated the «cement brick – steel reinforcement» system with 2% MgCl2 solution. The sample of cement brick do not containing calcium stearate has a reinforcement passivity violation after 6 months in a highly corrosive chloride-containing medium. The sample of cement brick containing calcium stearate have not changed during 2 years of testing. Small values of the corrosion rate indicators show the absence of corrosion damage of steel reinforcement in cement brick. However, corrosive particles accumulating at the surface of the reinforcement over time intensify the corrosion of steel. In cement concrete of waterproof grades W4-W16 corrosion of steel reinforcement proceeds 2-5 times slower compared to reinforcement in concrete without the addition of a hydrophobizer. Indeed, corrosion of steel in hydrophobized concrete starts later, as it takes considerably longer to reach the chloride ion limit at the surface of the reinforcement.