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Abstract
The propensity of acid corrosion for X65 steel substrate leads to application restrictions. In this research, we develop an efficient and new corrosion inhibitor, S-(benzo[d]thiazol-2-yl) (E)-2-(2-aminothiazol-4-yl)-2-(methoxyimino)ethanethioate (BTAE), as a first example of a sulfuric acid medium additive containing both benzothiazole and aminothiazole with multiple anchoring centers, which can inhibit the X65 corrosion in the sulfuric acid medium. The electrochemical experiment test shows that BTAE can effectually control the anodic reaction of X65 steel and belongs to the anodic type corrosion inhibitor. The corrosion inhibition efficiency of BTAE can still be maintained above 97% within a certain temperature range. The surface topography analysis and electrochemical test results are highly consistent. The adsorption of BTAE onto the interface of X65 steel conforms to the Langmuir model. Quantum chemistry and molecular dynamics simulation results have proved that BTAE is an excellent corrosion inhibitor.
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