Change search
ReferencesLink to record
Permanent link

Direct link
Electrochemical investigation of "green" film-forming corrosion inhibitors:  
KTH, School of Chemical Science and Engineering (CHE).
2011 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesisAlternative title
Elektrokemisk undersökning av "grön" filmbildande korrosionsinhibitorer :   (Swedish)
Abstract [en]

In this work, a comparative electrochemical study has been performed to evaluate corrosion inhibition property of several film-forming corrosion inhibitors provide by Akzo Nobel on carbon steel in a chloride solution. For carbon steel exposed to 1 M NaCl solution with and without added inhibitor, electrochemical measurements including electrochemical impedance spectroscopy (EIS), linear polarization resistance (LPR) at different exposure time intervals, and potentiodynamic polarization at the termination of the exposure, have been performed to investigate the film forming process and to evaluate corrosion inhibition efficiency of the inhibitors, as well as its evolution with time.

The corrosion resistance data obtained from the EIS and LPR measurements are in good agreement. The results indicate different inhibition properties of the inhibitors tested. The inhibition effect of SSF CI-1 is negligible in the first hour of exposure, but it increases steadily with time for 1 day, and then remains the same level during the exposure up to one week. SSF CI-2 exhibits a good inhibition effect in the first hour, but the effect decreases with time to a low level after 8 hours, and then increases again with prolonged exposure. SSF CI-4 shows a low inhibition effect during the first day, and then increases to a maximum level after three days’ exposure. For SSF CI-5 and SSF CI-6, the inhibition effect within 8 hours is relative low but higher than that of SSF CI-4, and the effect increases with time during prolonged exposure. The SSF CI-5 seems to be better than SSF CI-6 because of a more stable inhibition effect.

The EIS results indicate that most of the inhibitors form a resistive surface film on carbon steel, which becomes more resistive and protective after several days’ of exposure. However, in the initial stage of exposure, the SSF CI-6 does not show an effect of formation of a resistive film on the surface. The potentiodynamic polarization measurements suggest that, SSF CI-1 and SSF CI-2 are anodic type inhibitor, SSF CI-4 is cathodic type inhibitor, and SSF CI-5 and SSF CI-6 are mix type inhibitor.

Moreover, the inhibitors tested show a similar corrosion inhibition effect as mussel adhesive protein (MAP) at the low dosage level.

Place, publisher, year, edition, pages
2011. , 61 p.
Keyword [en]
corrosion inhibitor, “green chemistry”, film forming, electrochemical method, inhibition efficiency
National Category
Other Chemistry Topics
URN: urn:nbn:se:kth:diva-40888OAI: diva2:442816
Subject / course
Materials Design and Engineering
Educational program
Master of Science - Materials Science and Engineering
Physics, Chemistry, Mathematics
Available from: 2011-11-28 Created: 2011-09-22 Last updated: 2011-11-28Bibliographically approved

Open Access in DiVA

fulltext(4385 kB)1088 downloads
File information
File name FULLTEXT01.pdfFile size 4385 kBChecksum SHA-512
Type fulltextMimetype application/pdf

By organisation
School of Chemical Science and Engineering (CHE)
Other Chemistry Topics

Search outside of DiVA

GoogleGoogle Scholar
Total: 1088 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 225 hits
ReferencesLink to record
Permanent link

Direct link