Abstract
In this work, a novel Cu-BTA-Na2MoO4-HNTs corrosion inhibitor was reported by loading Na2MoO4 and benzotriazole (BTA) into halloysite nanotubes (HNTs), followed by incorporated insoluble Cu-BTA complex stoppers at the end of tubes through the interaction between BTA and Cu2+. For Cu-BTA-Na2MoO4-HNTs, BTA can not only participate in the stoppers preparation of Cu-BTA complex extending the release time of Na2MoO4, but also act as another corrosion inhibitor similar with Na2MoO4. Very importantly, the obtained Cu-BTA-Na2MoO4-HNTs is also responsive to acid medium, owing to the decomposition of the insoluble Cu-BTA complex in acid solution. In addition, the Q235 steel in 3.5% NaCl + 1.0 g/L Cu-BTA-Na2MoO4-HNTs shows higher inhibition efficiency than Q235 steel in 3.5% NaCl, such as the inhibition efficiency can be improved to 60.39% at 48 h by the synergistic effect between Na2MoO4 and BTA. Therefore, Cu-BTA-Na2MoO4-HNTs is a promising efficient and acid-response corrosion inhibitor for carbon steel.
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