The effect of time evolution and timing of the electrochemical data recording of corrosion inhibitor protection of hot-dip galvanized steel

• Published in: Corrosion science Vol. 173; p. 108780
• Main Authors: Meeusen, M., Zardet, L., Homborg, A.M., Lekka, M., Andreatta, F., Fedrizzi, L., Boelen, B., Mol, J.M.C, Terryn, H.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier Ltd 15.08.2020; Elsevier BV
• Subjects: Corrosion; Corrosion inhibitor; Corrosion inhibitors; Corrosion prevention; Corrosion tests; Data recording; Electrochemical impedance spectroscopy; Electrochemical noise; Electrochemistry; Electrode polarization; Galvanized steel; Galvanized steels; Hot dip galvanizing; Hot dipping; Linear polarization; Methodology; Open circuit voltage; ORP-EIS; Silicon dioxide; Spectrum analysis; Time domain analysis; Electrochemistry; ORP-EIS; Methodology; Corrosion inhibitor
• ISSN: 0010-938X; 1879-0496
• DOI: 10.1016/j.corsci.2020.108780

•All systems have a system-specific ‘stabilization’ time which affects the interpretation of the results of macroscopic EC techniques.•The importance of the EC in the time-domain is highlighted.•The necessity of detailed (macroscopic) EC analysis is underlined.. In previous work, the importance of taking the time-domain into account when studying corrosion inhibitor-containing electrochemical systems was highlighted. In this work, odd random phase electrochemical impedance spectroscopy (ORP-EIS) is applied as the electrochemical tool to study the time-effect by the evaluation of the non-stationarities per frequency decade over time for the screening of different silica- and phosphate- based corrosion inhibitors for hot-dip galvanized steel and possible corrosion inhibitor synergism. This serves as the basis for the interpretation of the results obtained from different macroscopic electrochemical techniques such as potentiodynamic polarization (PP), open circuit potential (OCP) with superimposed linear polarization resistance (LPR), electrochemical impedance spectroscopy (EIS) and electrochemical noise (EN) measurements. The analysis of the time-domain shows that all systems have a system-specific ‘stabilization’ time which affects the interpretation of the results obtained from the macroscopic electrochemical techniques. Furthermore, these results indicate that all corrosion inhibitors tested exhibit corrosion protective action and that the combination of both silica-based corrosion inhibitors show synergistic action on hot-dip galvanized steel.