Corrosion Inhibitor Applications

Corrosion Inhibitor Applications

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Corrosion Inhibitor containing APQ's

Quaternary alkyl pyridinium (APQ) salts used in corrosion inhibitors will excite in the UV and emit in the visible range. Wilson’s instrumentation can be used to identify the presence and concentration of these intrinsically fluorescent corrosion inhibitors with a 1 ppm detection limit. The only sample preparation necessary is filtration and dilution. Measurments can be taken out in the field using Wilsons durable QuatBox, in a nearby lab using the LabBox or samples could be studied using the Open Platform System (OPS) that allows for various configurations. Fluorescence in regards to corrosion inhibitor detection provides the high accuracy of HPLC testing and better reproducibility than the chloroform extraction method.

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Fluorescence measurement of a corrosion inhibitor containing APQs using the cuvette holder on the OPS.
Figure 1. Fluorescence measurement of a corrosion inhibitor containing APQs using the cuvette holder on the OPS.

Corrosion Inhibitors containing Fluorescent Imidazolines

APQ-containing corrosion inhibitors could be quantified using ultraviolet-excitation fluorescence. Engenium Chemicals (Calgary, AB) has recently developed an intrinsically-fluorescent imidazoline corrosion inhibitor, which when formulated into a corrosion inhibitor package provides for fluorescent detection (with UV excitation) with similar detection limits to APQ formulations. Wilson’s instrumentation can thus be used to identify the presence and concentration of these imidazoline-based corrosion inhibitors.

Calibration curve of fluorescent imidazoline
Figure 1. Calibration curve of fluorescent imidazoline using a 365 nm excitation.