8-Hydroxy-7-(-4-methoxy-phenylazo) quinoline-5-sulfonic acid as corrosion inhibitor for copper in acidic medium
Fouda, A., El-Maksod, S., El-Shiekh, K. (2016). 8-Hydroxy-7-(-4-methoxy-phenylazo) quinoline-5-sulfonic acid as corrosion inhibitor for copper in acidic medium. EKB Journal Management System, 6(1), 57-67. doi: 10.21608/sjdfs.2016.194537
A. S. Fouda; S. E El-Maksod; K. El-Shiekh. "8-Hydroxy-7-(-4-methoxy-phenylazo) quinoline-5-sulfonic acid as corrosion inhibitor for copper in acidic medium". EKB Journal Management System, 6, 1, 2016, 57-67. doi: 10.21608/sjdfs.2016.194537
Fouda, A., El-Maksod, S., El-Shiekh, K. (2016). '8-Hydroxy-7-(-4-methoxy-phenylazo) quinoline-5-sulfonic acid as corrosion inhibitor for copper in acidic medium', EKB Journal Management System, 6(1), pp. 57-67. doi: 10.21608/sjdfs.2016.194537
Fouda, A., El-Maksod, S., El-Shiekh, K. 8-Hydroxy-7-(-4-methoxy-phenylazo) quinoline-5-sulfonic acid as corrosion inhibitor for copper in acidic medium. EKB Journal Management System, 2016; 6(1): 57-67. doi: 10.21608/sjdfs.2016.194537

8-Hydroxy-7-(-4-methoxy-phenylazo) quinoline-5-sulfonic acid as corrosion inhibitor for copper in acidic medium

Scientific Journal for Damietta Faculty of Science
Volume 6, Issue 1, June 2016, Page 57-67  XML PDF (1.03 MB)
Document Type: Original articles
DOI: 10.21608/sjdfs.2016.194537
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Authors
A. S. Fouda1; S. E El-Maksod2; K. El-Shiekh email 3
1Chemistry Department, Faculty of Science, Mansoura University
2Chemistry Department, Faculty of Science, Port Said University
32 Chemistry Department, Faculty of Science, Port Said University
Abstract
The Corrosion inhibition of copper in nitric acid has been studied by 8-hydroxy-7-(-4-methoxy-phenylazo) quinoline-5-sulfonic acid using weight loss and electrochemical measurements. It was found that the (HQSA) act as a good corrosion inhibitor for copper in all concentrations of the inhibitor. The inhibition action depends on the concentration of the (HQSA) in the acid solution. Results for weight loss and electrochemical measurements indicate that inhibition efficiency increases with increasing inhibitor concentration. Polarization curves revealed that this compound is mixed type inhibitor. The adsorption of (HQSA) on the surface of the copper specimens obeys Temkin adsorption isotherm. Some thermodynamic and kinetic parameters for the corrosion process were estimated, and the values support the results obtained. Some quantum chemical parameters for (HQSA) were calculated.
Keywords
Corrosion; Electrochemistry; Copper; Polarizatio
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