Triethanolamine dodecylbenzene sulfonate

Catalog Number

ACM27323417-1

CAS

27323-41-7

Structure

IUPAC Name

2-[Bis(2-hydroxyethyl)amino]ethanol;4-dodecan-3-ylbenzenesulfonic acid

Synonyms

TEA-dodecylbenzenesulfonate

Molecular Weight

475.68

Molecular Formula

C24H45NO6S

Canonical SMILES

CCCCCCCCCC(CC)C1=CC=C(C=C1)S(=O)(=O)O.C(CO)N(CCO)CCO

InChI

DBNIPVLIXGKUHK-UHFFFAOYSA-N

InChI Key

InChI=1S/C18H30O3S.C6H15NO3/c1-3-5-6-7-8-9-10-11-16(4-2)17-12-14-18(15-13-17)22(19,20)21;8-4-1-7(2-5-9)3-6-10/h12-16H,3-11H2,1-2H3,(H,19,20,21);8-10H,1-6H2

Active Content

30-95%

6.5-9.5

Typical Applications

Dispersing agent

MSDS

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COA

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Spec Sheet

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Case Study

Triethanolamine Dodecylbenzene Sulfonate (TDS) Used for Suppressing Chloride-Induced Metastable Pitting in 304 Stainless-Steel Reinforcement of Marine Concrete

Triethanolamine Dodecylbenzene Sulfonate (TDS) Used for Suppressing Chloride-Induced Metastable Pitting in 304 Stainless-Steel Reinforcement of Marine Concrete Liao, Yingdi, et al. Available at SSRN 4899297.

In simulated concrete pore solution (pH ≈ 13.5) contaminated with 0.6 M Cl⁻, electrochemical noise, potentiodynamic polarisation, AFM imaging and Mott-Schottky analysis were combined to probe how graded additions (0-5 × 10⁻⁴ mol L⁻¹) of triethanolamine dodecylbenzene sulfonate (TDS) modulate the early stages of pitting on 304 stainless-steel rebars. Increasing TDS shifted the corrosion potential (E_corr) from -286 mV to -165 mV vs SCE and elevated the breakdown potential (E_b) by ~120 mV, signalling a more robust passive state. Statistical de-convolution of current transients showed that pit-initiation frequency, average pit growth rate and charge per pit fell by 63 %, 58 % and 69 %, respectively, when TDS reached 3.364 × 10⁻⁴ mol L⁻¹.
Mott-Schottky plots revealed a concurrent drop in donor density (1.4 × 10²⁰ → 3.5 × 10¹⁹ cm⁻³) and thickening of the space-charge layer, indicating formation of a compact, Cr-enriched barrier. AFM corroborated these findings: surface roughness decreased from 11.2 nm to 4.3 nm and no pits > 50 nm were detected after 24 h exposure at optimum inhibitor level.
Mechanistically, the sulfonate tail chemisorbs on anodic sites while the triethanolamine head chelates surface Fe³⁺, synergistically blocking chloride ingress and hindering the transition of metastable nuclei into stable pits. For marine-grade reinforced concrete, dosing TDS at ≥ 3.4 × 10⁻⁴ mol L⁻¹ is recommended to extend service life by stabilizing the passive film against chloride attack.

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