Corrosion Protection of Steel by Volatile Corrosion Inhibitors: Vapor Analysis by Gas-Diffusion Microextraction and Mass Loss and Electrochemical Impedance in NaCl Deliquescence Tests

• Type: Article in International Scientific Journal
• Date: 2020

Authors

Valente, MAG (Author) Other; Goncalves, LM (Author) Other; Passaretti, J (Author) Other; Cardoso, AA (Author) Other; Rodrigues, JA (Author) FCUP; Fugivara, CS (Author) Other; Benedetti, AV (Author) Other

Journal

Title: Journal of the Brazilian Chemical Society

Vol. 31

Pages: 2038-2048

ISSN: 0103-5053

Publisher: Sociedade Brasileira de Quimica

Indexing

ISI Web of Knowledge - 3 Citations

Scopus - 3 Citations

Other information

Authenticus ID: P-00S-WE7

DOI: 10.21577/0103-5053.20200104

Abstract (EN): A new methodology using gas-diffusion microextraction (GDME) was developed for the analysis of volatile corrosion inhibitors (VCIs). The evaluation of the inhibition efficiency and corrosion rate (v) was performed by NaCl deliquescence tests and correlated with measurements of polarization resistance (R-P) obtained from electrochemical impedance spectroscopy (EIS) analysis and with the pH resulting from the atmosphere of the inhibitor (pH(GDME)). The correlation obtained between v and pH(GDME) indicates that the higher the value of pH(GDME) the lower the corrosion rate. The Raman spectra of steel was used to monitor in situ adsorption of VCI and the surface modifications caused by the inhibitors. The scanning electron microscopy (SEM) images corroborate the data of v. both indicating that the cyclohexylamine vapor showed the best corrosion resistance performance.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 11