Colza oil based coatings for temporary protection of steel against atmospheric corrosion

摘要

Coatings on base of low erucic colza oil have been studied against the carbon steel atmospheric corrosion. Corrosion tests of the carbon steel samples covered with the film of unrefined low erucic colza oil (UCO), its compositions with different fillers, the products of hydrolysis of UCO were made in the salt solution (3% NaCI) for 14 days at the room temperature, thermo-moisture chamber (one cycle includes exposure for 8 h at 40°C and 100% relative humidity and for 16 h at gradual cooling to room temperature in the switched off and closed reactor) for 30 days and in an open site in the conditions of the industrial atmosphere for 12 months. Protective coatings on base of UCO and its components are not effective in the presence of the chloride ions, but insertion of the synthetic fat acids bottoms (SFAB) additive (20 wt.% ) or IFHAN-29 A (a product of interaction between tall pitch and higher aliphatic amines) into UCO heightens the coating protective effect up to 98% in 3% NaCI solution. Protective effect of coatings on base of UCO and the products of its hydrolysis (phospholipids, soaps, hydrated oil and other) reaches 98 - 99 % in the thermo-moisture chamber. The corrosion tests in an open site after 12 months duration of the experiment have shown protective effect equal to 95%.