Factors affecting the determination of electrochemical noise resistance

摘要

The similarity between electrochemical noise resistance (R{sub}n) and polarization resistance (R{sub}p) has been confirmed in many laboratories, and a new method for corrosion rate determination has been developed based upon this similarity. However, this method remains controversial. Some researchers have reported experimental results that did not support a similarity between R{sub}p and R{sub}n. Other researchers have found that this similarity does not hold true for every system. To address this controversy, factors affecting the measurement and calculation of R{sub}n were investigated. Several factors including instrument noise, direct current (DC) trend, noise sampling rates, and noise sampling duration - can affect the accuracy of R{sub}n determination significantly and, in some cases, can cause disagreement between R{sub}n and R{sub}p. It was recommended that a system check be carried out to avoid the influence of these factors.