This post illustrates three cyclic anodic polarization curves of the precipitation hardening nickel alloy (PHNA) UNS N07718 —with a Specified Minimum Yield Strength, SMYS, of 140 ksi— in deaerated 3.5 wt% NaCl (pH 8.0).

Cyclic potentiodynamic polarizations were conducted in accordance with ASTM G61. The potential scan rate was 0.6V/h. The direction of the scan was reversed at i = 10 mA⋅cm^-2, assuring a minimum charge density of 10 C⋅cm^-2.

 

Acknowledgements

I like to thank Prof. Mauricio Rincón Ortiz (Industrial University of Santander) for conducting the experimental work and Dr. Raúl Rebak (General Electric) for providing the test samples.