Rapid quantitative spectroelectrochemical responses of hydrogel-based sensors for the in situ evaluation of corrosion inhibitors on steel

[Display omitted] •Hydrogels used to quantitatively evaluate corrosion inhibitor performance in situ.•Hydrogels demonstrate both impedimetric and photonic responses.•Performance correlates with literature trends of inhibitor surface coverage.•Sensor responses are rapid & sensitive to nanomole am...

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Bibliographic Details
Published in:Sensors and actuators. B, Chemical Chemical, 2019-06, Vol.289, p.175-181
Main Authors: Price, Capri A., Clare, Tami Lasseter
Format: Article
Language:English
Subjects:
Acrylic acid
Buffers (chemistry)
Corrosion
Corrosion inhibitors
Corrosion tests
Fatty acids
Fatty-acid
Hydrogels
Impedance
Organic chemistry
Photoelectrons
Photonic
Photonics
Potassium ferricyanide
Sensor
Sensors
Steel
Transition metals
X ray photoelectron spectroscopy
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Summary:[Display omitted] •Hydrogels used to quantitatively evaluate corrosion inhibitor performance in situ.•Hydrogels demonstrate both impedimetric and photonic responses.•Performance correlates with literature trends of inhibitor surface coverage.•Sensor responses are rapid & sensitive to nanomole amounts of iron ions. A direct sensor to quantitatively evaluate the inhibitory performance of a range of fatty acids (from formic to behenic) as corrosion inhibitors for steel is described. The sensor consists of a buffered polymeric hydrogel of 2-acrylamido-2-methylpropanesulfonic acid and poly(acrylic acid), equilibrated in potassium ferricyanide. This sensor responds to soluble transition metal ions by complexation to produce metal hexacyanoferrate, a process which rapidly induces measurable photonic and impedimetric changes within the hydrogel. X-ray photoelectron spectroscopy (XPS) was utilized to characterize differences in the surface chemistry across the range of inhibitors studied and to connect this work to other studies that investigated the surface coverage of some of the same molecules on steel. The contextualization of our simple, quantitative sensor responses via XPS and published literature suggest an improvement over current corrosion testing techniques, offering earlier, in situ detection with an understanding of the surface processes usually limited to advanced or high-vacuum techniques.
ISSN:0925-4005
1873-3077
DOI:10.1016/j.snb.2019.03.022