INHIBITOR OF STEEL CORROSION AND PROCEDURE FOR ITS PRODUCTION Russian patent published in 2011 - IPC C23F11/173 

FIELD: metallurgy.

SUBSTANCE: inhibitor contains, wt %: poly-acryl-amide with molecular weight 10⁴-10⁷ 0.0005-0.01; modified bentonite with contents of montmoryllonite 80% and over 0.1-0.5; soda ash 0.01-0.02 and water - the rest. The procedure consists in loading concentrated water solution of water soluble polymer corresponding to poly-acryl-amide of molecular weight 10⁴-10⁷ and concentration 0.01-0.2 wt % into a reservoir equipped with a mixer and pH metre. Further, the process is carried out with an operating mixer and concentrated water solution of soda ash is added at concentration 2-4 wt %; pH is brought to 8-9, water suspension solution of modified bentonite clay is introduced at rate not over 2 l/min where contents of montmorillonite is 80% and concentration 1-2 wt %. Produced mass is mixed during 3-5 min and there is added calculated amount of water.

EFFECT: inhibitor possesses high safety and corresponds to bio-decomposed substance with high protective properties of steel items from corrosion.

2 cl, 1 ex