Application notes 11 min read

Electrochemical Noise Measurements: Part II: ASTM assessment on a real electrochemical system- Corrosion – Application Note 39-2

Latest updated: August 25, 2021

Abstract

Noise measurements consist of recording the voltage and current fluctuations occurring when two electrodes of the same material (or not) are shorted. These measurements can lead to the determination of corrosion parameters. The fluctuations are of very small amplitude and this is why the choice of the instrument used in this purpose is critical. Efforts have been made by the American Society for Testing and Materials (ASTM) to give a procedure to characterize the measurement ability of the instrument. This second procedure involves a real electrochemical system namely a steel sample in acidic medium. A comparison of the noise resistance obtained using BioLogic instruments and by the authors lead to conclude that Bio-Logic instruments are suitable for noise measurements.

 

Introduction

The conclusions of the part I were that the intrinsic potential and current noise of the Bio-Logic potentiostats are better than what is required by ASTM to perform valid noise measurements. The objective of the part II is to take a step further in the validation of our instrument by comparing actual noise resistance measurements performed using BioLogic instruments to the results showed in the ASTM publication [1] on a real electrochemical system. Noise resistance is one of the many tools or values that can be used to interpret electrochemical noise data. It is written Rn and is generally defined as the standard deviation of the potential divided by the standard deviation of the current …

 

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