Corrosion Inhibition Behavior of Diethylenetriamine/ Thiourea Adduct for Steel Reinforcements in Concrete

J Chin Soc Corr Pro

2000, Vol. 20

Issue (1): 15-21 DOI:

Research Report

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Corrosion Inhibition Behavior of Diethylenetriamine/ Thiourea Adduct for Steel Reinforcements in Concrete

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同济大学混凝土材料研究国家重点实验室

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Abstract A new polymer DETA-TU(isomolar adduct of diethylenetriamine and thiourea) was first introduced into reinforced concrete to inhibit corrosion of the embedded steel reinforcements. Its inhibition behavior and mechanism were studyied with linear polarization, Tafel polarization, EIS method either in simulated pore solution(SPS) or in real concrete. The results showed that DETA-TUwas a mixing type inhibitor. A 1% dosage was sufficient to hinder the corrosion of steel bar in SPS cntaining 0.1 mol/L NaCl. The salt endurance was increased from 0.02mol/L to 0.10mol/L. The results also showed DETA-TU and NaNO2 had a significant synergistic effect for corrosion inhibition of reinforing bar, especially at lower NaNO2 concentration. The EIS revealed the double beneficial function of DETA-TU for reinforced concrete, i.e., densifying the concrete pore structure and adsorbing on the surface of the steel reinforcement. XPS analysis showed the inhibition was concentrated at the steel/ concrete interface. The concentration gradient of DETA-TU from the steel/concrete interface and bulk concrete eas crucial for its inhibition efficiency.

Key words: concrete corrosion inhibitor polymer

Received: 02 September 1998

ZTFLH:

TG174.42

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;. Corrosion Inhibition Behavior of Diethylenetriamine/ Thiourea Adduct for Steel Reinforcements in Concrete. J Chin Soc Corr Pro, 2000, 20(1): 15-21 .

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2000/V20/I1/15

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