In Situ Near Crack Tip pH Measurements to Confirm Alkaline Crack Conditions Causing Crack Arrest in Cathodically Polarized AA5456-H116

Author:

Montiel Gabriella C.1ORCID,Esmaeely Saba Navabzadeh1,Marino Gabriella1ORCID,Pope Jackson1,Free Brandon1,Catledge Katrina E.1ORCID,McAllister Donald1,(Warner) Locke Jenifer S.1ORCID

Affiliation:

1. *Department of Materials Science and Engineering, Fontana Corrosion Center, The Ohio State University, 2136 Fontana Labs, 140 W 19th Avenue, Columbus, Ohio 43210.

Abstract

In situ crack tip pH measurements for corrosion fatigue (CF) cracks in sensitized AA5456-H116 loaded under low loading frequencies show that cathodic polarization can arrest actively growing stress corrosion cracking (SCC) and CF cracks and produce a local alkaline crack tip pH. A method for measuring crack tip pH in situ was developed. For AA5456-H116 under a single level of high sensitization, CF experiments while loading in the Paris regime at a loading frequency of 0.1 Hz were conducted under freely corroding conditions and a cathodic polarization of −1.3 VSCE. Results show that under freely corroding conditions the crack actively grows, and the crack tip pH is slightly acidic, while at −1.3 VSCE an alkaline crack tip develops with a pH of 10 to 12. The findings of this study support the earlier published hypothesis that crack arrest of SCC and low loading frequency CF cracks is due to corrosion-induced blunting after the development of highly alkaline conditions that cause corrosion of the crack tip region blunting and halting the crack.

Publisher

Association for Materials Protection and Performance (AMPP)

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