Small concentrations of NaCl help building stable inhibiting layers from 2,5-dimercapto-1,3,4-thiadiazole (DMTD) on AA2024-T3

Journal article (2023)

Authors

J. Zhao Novel Aerospace Materials - Aerospace Engineering
A. Santoso ChemE/Product and Process Engineering - AS
Santiago J. Garcia Novel Aerospace Materials - Aerospace Engineering
Research Group
Novel Aerospace Materials (Aerospace Engineering) (TU Delft)
Copyright: © 2023 J. Zhao, A. Santoso, Santiago J. Garcia
DOI: https://doi.org/10.1016/j.corsci.2023.111562
More Info
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Published Date

2023

Language

English

Faculty

Aerospace Engineering

Department

Aerospace Structures & Materials

Research Group

Novel Aerospace Materials

Abstract

The interaction of 2,5-dimercapto-1,3,4-thiadiazole (DMTD) with the AA2024-T3 local microstructure (S-phase, secondary phases and matrix) as function of the NaCl concentration is studied. The inhibiting power and the local interaction of DMTD with the metal were studied by in–situ opto-electrochemistry, XPS and Raman spectroscopy. The stability of the inhibiting layers was evaluated by re-exposing the samples to NaCl solutions without inhibitor. The amount of DMTD and its interaction state (chemisorption/physisorption) vary with the local microstructural composition and NaCl concentration. Higher stability of the inhibiting layers is obtained when these are formed in presence of small amounts of NaCl (0.025–0.25 M).