Measurements have been made on the protective performance of fresh and oxidized rapeseed oil (RO) under conditions of atmospheric corrosion of carbon steel. We examined the effects of additive IFKhAN-29A, including those on the kinetics of the partial electrode reactions in 0.5 M NaCl solution. It is found that a thermal humidity chamber and natural conditions produce protective effects of more than 95% from thin films of RO, but which is substantially reduced in the presence of chloride ions.