Abstract: Based on analyzing the inhibition behavior of amino alcohol corrosion inhibitors to concrete and steel rebar, the inhibition mechanism of amino alcohol corrosion inhibitors was put out, which on the one hand form a protective film on the steel rebar surface, isolating corrosive ions from the surface of steel rebar, on the other hand react with the hydration products in concrete to precipitate, improving the compactness of concrete. The two are complimentary, which play the role in delaying corrosion and reducing steel corrosion rate. Amino alcohol corrosion inhibitors has minimum inhibition effect in carbonated concrete environment, and still has effect in chloride environment, but when the chloride ion concentration or the corrosion rate is high in concrete, the effect of corrosion inhibitors are significantly reduced. Because the composition of corrosion inhibitors is complicated, its membrane mechanism still needs to be researched further.

Key words: amino alcohol;corrosion inhibitor;inhibition mechanism;reinforced concrete