ABSTRACT
The corrosion of steel is the main problem that damages the durability of concrete, especially in coastal areas. Chloride ion erosion is the main cause of steel corrosion. In this paper, concrete pore solution was taken as external medium of steel, and it was assumed that the harmful ion had passed the barrier of concrete cover and reached the surface of steel. The influence of amino carboxylic acid added corrosion inhibitor, migration corrosion inhibitor and zinc-based alloy sacrificial anode protection on the corrosion behavior of steel in the pore solution was investigated by electrochemical test and steel static weight loss test. The experimental results show that amino carboxylic acids added corrosion inhibitor can obtain better corrosion inhibition effect in a neutral environment; and its efficiency improved first in line with the increase of chloride ion concentration and then decreased. Amino carboxylic acid migration corrosion inhibitor can obtain better corrosion inhibition effect in alkaline environment, and its efficiency increases with the increase of chloride ion concentration. Zinc-based alloy sacrificial anode protection method has a good effect on corrosion inhibition in an alkaline environment. The results can provide reference for durability protection of concrete structures in coastal areas.
