Comparison Of CPT-Values Of UNS N08935, UNS N06625, UNS N06455 And UNS N06985 By Use Of A New Electrochemical Method

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Product Number: 51321-16665-SG

Author: Anna Delblanc; Nian Zhou

Publication Date: 2021

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The comparison of the pitting resistance of alloys with high corrosion resistance can be challenging, as
CPT-values (critical pitting temperatures) are often above the boiling point of the test solutions. For
high-nickel alloys, the use of potentiostatic electrochemical methods at increasing temperatures can
also be questionable, as this alloy type often shows high or continuously increasing current densities
with increasing temperature, rather than the desired distinct current peak at pitting. The applied
electrochemical potential must also be proven to be below the transpassive potentials of the tested
alloys.
A new electrochemical method has been developed in which CPT-values could be determined of alloys
UNS N08935, UNS N06625, UNS N06455 and UNS N06985. The electrochemical potential used is
shown to be below transpassive potentials. The current density versus temperature curves were
analyzed and showed low passive current densities up to temperatures where pitting started.
CPT-values of the tested alloys were around 90°C for UNS N08935, UNS N06625 and UNS N06455
and 55°C for UNS N06985.