Cyclic Polarization Measurements—Experimental Procedure and Evaluation of Test Data

Abstract

ASTM Subcommittee G01.11 on Electrochemical Measurements in Corrosion Testing has conducted round-robin testing on the reproducibility of cyclic potentiodynamic polarization measurements for determining susceptibility to localized corrosion. This work was used in the development of a practice that provides a standard experimental procedure for conducting these tests. This paper presents the experimental procedure and results of the round-robin tests with statistical analysis of the data. The reproducibility of the measurements and sources of error are discussed.

The effect of porous coating processing on the corrosion behavior of cast Co–Cr–Mo surgical implant alloys

“…A breakdown potential and a positive hysteresis loop on cyclic scanning was observed in this study. This has been taken by others to be a manifestation of localized corrosion (1,3,12,23) and, in the design of the present study, could be interpreted as crevice corrosion (25,26). However, additional electrochemical tests and scanning electron microscopy did not demonstrate any evidence of localized corrosion.…”

Effect of chemical passivation treatment on pitting corrosion resistance of AISI 410 and 17–4 PH stainless steels

“…The pitting potential is defined as the point where the anodic polarization curve experiences an abrupt increase in the current value. The repassivation potential may be determined by two different ways: one is selecting the value of potential where the hysteresis loop is complete or corrosion potential is reached and another is using the potential at which a predetermined value of current is reached in the reverse scan . In this study it was chosen to use the criterion defined by Shiddar et al where the repassivation potential is defined when the reverse polarization curve reaches the current of 2 μA.…”

Siloxane-based thin films for corrosion protection of stainless steel in chloride media

“…A saturated calomel electrode (SCE) was used as reference electrode (RE) while a platinum wire (0.5 mm dia. 9 10 cm long AlfaAesar) was used as counter electrode (CE) [42][43][44]. Cell compartment for the RE was connected to the working electrode (WE) compartment through a Luggin capillary.…”

“…The corrosion potential (E corr ) of the substrates with and without monolayer (4 cm 2 exposed area) were measured in the tested solution for 12 h. After this period, a potential sweep was applied with a scan rate of 1 mV s -1 , starting at a potential of 200-300 mV more negative than the measured E corr and up to a potential in which the anodic current density (j) reached a value of 1 mA cm -2 [44]. Voltammograms are presented in the Tafel form [Potential (V) vs. log (j)].…”