***Data underlying the publication: Small concentrations of NaCl help building stable inhibiting layers from 2,5-dimercapto-1,3,4-thiadiazole (DMTD) on AA2024-T3***
Authors: Jingjing Zhao, Albert Santoso, Santiago J. Garcia
Aerospace Structures and Materials department, Faculty of Aerospace Engineering, Delft University of Technology, Delft
Department of Chemical Engineering, Delft University of Technology, Delft

Corresponding author: Jingjing Zhao

Contact Information: 
J.Zhao-6@tudelft.nl
Faculty of Aerospace Engineering
Delft University of Technology
Kluyverweg 1
2629 HS Delft
the Netherlands

1. Introductory information

This dataset includes the raw data and processed data related to the paper "Small concentrations of NaCl help building stable inhibiting layers from 2,5-
dimercapto-1,3,4-thiadiazole (DMTD) on AA2024-T3". doi:10.1016/j.corsci.2023.111562. This research aims to understand the interaction of an organic inhibitor: DMTD with the AA2024-T3 and the stability of inhibiting layers. This is a fundamental study on the corrosion inhibitor for AA2024-T3. 

All the data are included in a 7Z file named: Manuscript data Zhao, et al.'Small concentrations of NaCl help building...on AA2024'. After extracting the folder. Two subfodlers named as "raw data" and "processed data". In each subfolder, the data are catagrogried into 4 folders depending on their resourcing set-ups: (1) Optical-electrochemical data; (2) Raman;(3)XPS; (4)SEM-EDS.

2. Methodological information

(1) The optical-electrochemical data is collected to study the interaction between DMTD with the AA2024-T3 and the stability of the inhibiting layer. This allows obtaining high-resolution images during exposure to electrolyte simultaneously to the electrochemical potential noise (EPN) measurements as function of the exposure time by a  magnetic Raman electrochemical flow cell from Redox.me.THe EPN signal can be exported as TXT and processed in Origin. The optical images are processed in ImageJ and saved as PNG/JPG file. Details of the image processing can be found in previous work: " M. Olgiati, P.J. Denissen, S.J. Garcia, When all intermetallics dealloy in AA2024-T3: Quantifying early stage intermetallic corrosion kinetics under immersion, Corrosion Science, 192 (2021). https://doi.org/10.1016/j.corsci.2021.109836"

(2) Raman data are collected by a Renishaw inVia Confocal Raman spectrometer equipped with a 32 mW laser source at 532 nm. THe raw data are exported as TXT and JPG images (Raman maps) and the spectrums are processed in Origin.

(3) XPS data are collected by a ThermoFisher K-alpha XPS system equipped with a monochromatic Al anode X-ray source with a spot size of 400 µm.The raw data are exported in EXCEL and processed in Origin.

(4) SEM-EDS are used to identify the types of local intermetallic particles. THe data are exported as images(TIF files) and report of EDS in WORD files.

3. Data specific information
(1) The optical-electrochemical data has been organised per sample. Each sample is named as the exposure conditions: exposure or reexposure-polished AA2024 in 1mM DMTD X M NaCl. X=the concentration of NaCl.
(2) The Raman data has been organised by global analysis and local analysis. Global analysis include exposure and re-exposure. local analysis includes 3 differnet locations.
(3) The XPS raw data has been organised per sample. Each sample is named as H-D_X. X=the concentration of NaCl. The processed data are shown in one folder with images been used.
(4) The SEM-EDS datahas been catagorized in "Caculation of IMs"; "AA2024-T3 before and after exposure..."; and "postmortem after reimmersion" with the images and reports(word) in each folders.
