Corrosion Inhibition of Brazing Cu-Ag Alloy with 1,2,3-Benzotriazole and 2,5-Dimercapto-1,3,4-Thiadiazole
| Autor: | Hooman Rahmani, Efstathios I. Meletis |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Benzotriazole
Materials science General Chemical Engineering Alloy Potentiodynamic polarization 02 engineering and technology General Chemistry engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Corrosion chemistry.chemical_compound Adsorption chemistry engineering Brazing General Materials Science Ag alloy 0210 nano-technology 2 5 dimercapto 1 3 4 thiadiazole Nuclear chemistry |
| Zdroj: | Corrosion. 77:29-39 |
| ISSN: | 1938-159X 0010-9312 |
| Popis: | Adsorption and inhibition behavior of 1,2,3-benzotriazole (BTA) and 2,5-dimercapto-1,3,4-thiadiazole (DMTD) on brazing Cu-Ag alloy was studied in deionized water using potentiodynamic polarization measurement, adsorption isotherm investigation, and x-ray photoelectron spectroscopy (XPS). Pure Ag and pure Cu were included to investigate the mere effect of each component on the alloy’s behavior. Results show better inhibition of DMTD for Ag and BTA for Cu, both by chemisorption. BTA was found to follow Langmuir isotherm while DMTD obeyed Temkin adsorption isotherm, despite both acting as a mixed-type inhibitor. Combining the two inhibitors increased the inhibition efficiency over 80% for the Cu-Ag alloy. XPS spectra demonstrate the formation of DMTD protective film through DMTD’s functional groups of pyrrolic N from the azole ring and thiol S from the mercapto anchoring group on Ag and thiol S on Cu. Compared to BTA, the higher affinity of DMTD to Ag was attributed to the involvement of two heteroatoms with the Ag surface. |
| Databáze: | OpenAIRE |
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