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Analysis Of Corrosion Inhibitor Performance Curves Using Langmuir Adsorption Kinetics

Product Number: 51321-16859-SG
Author: Richard C. Woodlam; Daniel Betancourt
Publication Date: 2021
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Many corrosion inhibitor performance tests track the corrosion rate over time utilizing electrochemical methods such as linear polarization resistance (LPR). In most of these tests only a portion of the test data gathered are utilized in the final analysis of the corrosion inhibitor performance, namely, the initial uninhibited corrosion rate and the final steady state inhibited corrosion rate, from these two results the corrosion inhibitor performance or efficiency is calculated. Unfortunately, in this approach only the start and end of the test are utilized while the
transient response of the corrosion rate versus time curve is discarded. The following paper describes an analysis method using Langmuir adsorption kinetics to extract from the response curve not only the corrosion inhibitor efficiency, but also the adsorption and desorption rate constants.

Many corrosion inhibitor performance tests track the corrosion rate over time utilizing electrochemical methods such as linear polarization resistance (LPR). In most of these tests only a portion of the test data gathered are utilized in the final analysis of the corrosion inhibitor performance, namely, the initial uninhibited corrosion rate and the final steady state inhibited corrosion rate, from these two results the corrosion inhibitor performance or efficiency is calculated. Unfortunately, in this approach only the start and end of the test are utilized while the
transient response of the corrosion rate versus time curve is discarded. The following paper describes an analysis method using Langmuir adsorption kinetics to extract from the response curve not only the corrosion inhibitor efficiency, but also the adsorption and desorption rate constants.

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