Triethanolamine dodecylbenzene sulfonate

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For Research Use Only | Not For Clinical Use

CAT	APB27323417
CAS	27323-41-7
Structure
Molecular Weight	475.69
Molecular Formula	C24H45NO6S

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Case Study

Triethanolamine Dodecylbenzene Sulfonate Used for the Investigation of Corrosion Inhibition in Chloride-Exposed Reinforced Mortar Systems

Zhao, Yazhou, et al. Cement and Concrete Research 165 (2023): 107073.

Triethanolamine dodecylbenzene sulfonate (TDS) has been explored as an organic corrosion inhibitor for reinforced concrete structures subjected to aggressive marine environments. Chloride penetration, exacerbated by drying-wetting cycles, accelerates reinforcement corrosion, making the evaluation of TDS crucial for sustainable infrastructure protection.
In a recent study, mortar specimens embedded with steel reinforcement were exposed to cyclic immersion in 5% NaCl solution, followed by drying phases, to simulate marine conditions. Electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization tests were employed to assess TDS performance. Initially, TDS showed moderate inhibition efficiency during the early wetting-drying cycles, suggesting temporary adsorption on the iron surface. However, with prolonged cycling (24 cycles), its efficiency drastically declined to -410.96%, indicating a detrimental effect where TDS promoted corrosion instead of mitigating it.
Morphological analysis of the mortar/steel interface revealed that TDS entrained large hydration pores, compromising structural compactness. In contrast, quantum mechanical simulations confirmed that adsorption of the TDS molecule involved electronegative atoms (N and S) and π-bonds of the benzene ring, yet the adsorption was less stable than that of alternative inhibitors such as triethanolamine phosphate.
This case highlights the limitations of TDS as a corrosion inhibitor under repeated chloride cycling, emphasizing that while its chemical structure allows initial surface interaction, long-term stability in reinforced concrete systems remains inadequate. Such findings guide the rational design of more effective inhibitors for marine construction applications.

Triethanolamine Dodecylbenzene Sulfonate Used for the Mitigation of Metastable Pitting Corrosion in 304 Stainless Steel

Liao, Yingdi, et al. Journal of Ocean University of China 24.4 (2025): 1017-1026.

Triethanolamine dodecylbenzene sulfonate (TDS) has been evaluated as an organic inhibitor for reducing chloride-induced pitting corrosion in stainless steel within simulated concrete pore solutions (SCPS). Reinforcement corrosion is a critical challenge in marine-exposed concrete structures, and metastable pitting represents the early stage of degradation leading to structural failure.
Electrochemical testing and atomic force microscopy (AFM) were employed to analyze the effect of TDS on the pitting behavior of 304 stainless steel (304 SS). Results indicated that with increasing concentrations of TDS, both corrosion potential (Ecorr) and breakdown potential (Eb) shifted positively, signifying enhanced resistance against chloride attack. Statistical analysis of metastable pits revealed a consistent reduction in initiation and growth parameters, highlighting TDS's ability to suppress pit nucleation.
Further insights were obtained from Mott-Schottky tests, where donor density (ND) decreased while the space charge layer thickness (W) increased in the presence of higher TDS concentrations. This suggests that TDS promotes the stabilization of a passive film, thereby reducing susceptibility to pit propagation. Importantly, at concentrations above 3.364 × 10-4 mol/L, TDS significantly hindered the transition of metastable pits into stable pits, effectively strengthening the protective oxide layer.
This study demonstrates that TDS is a promising corrosion inhibitor for 304 SS reinforcement under chloride-contaminated alkaline environments, providing a mechanistic basis for its application in marine concrete systems.

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