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Corrosion inhibitor distribution on abrasive-blasted steels.

Published version
Peer-reviewed

Type

Article

Change log

Authors

Krautsieder, A 
Sharifi, N 
Madden, DC 
Sonke, J 
Routh, AF 

Abstract

HYPOTHESIS: Abrasive-blasted steel surfaces exhibit a complex, multi-substrate environment. Adsorption to contaminant substrates can reduce the amount of available corrosion inhibitor and decrease its efficiency. Knowledge of where inhibitors preferentially adsorb is required. EXPERIMENTS: The quantitative extent and strength of adsorption of the representative corrosion inhibitor benzotriazole (BTAH) from toluene to particular substrates is given, including corrections for solution self-association, and complemented by X-ray photoelectron spectroscopy (XPS), sum-frequency generation spectroscopy (SFG), and quartz crystal microbalance (QCM) measurements. FINDINGS: All substrates show adsorbed BTAH layers. Based on the adsorption strength, preferential adsorption is found to be in the order steel > iron oxide > calcium carbonate and garnet > silica - this is relevant when there is limited BTAH. However, with ample BTAH, the amounts adsorbed in the plateau regions of the isotherm are more relevant and the order is calcium carbonate and silica > iron oxide > garnet > steel. Although the contaminant substrates deplete the BTAH concentration, the steel should still have a complete monolayer of BTAH inhibitor. This work is part of a larger initiative developing novel methods of corrosion inhibitor delivery via the blasting process, to prevent corrosion between blasting and repainting.

Description

Keywords

Abrasive blasting, Adsorption, Corrosion inhibition, Steel maintenance

Journal Title

J Colloid Interface Sci

Conference Name

Journal ISSN

0021-9797
1095-7103

Volume Title

634

Publisher

Elsevier BV