Journal
CORROSION SCIENCE
Volume 89, Issue -, Pages 146-153Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2014.08.022
Keywords
Superalloys; Polarization; SEM; Pitting corrosion; Corrosion fatigue
Funding
- National Energy Technology Laboratory's ongoing research in materials for ultra-deep drilling under the RES [DE-FE000400]
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The effect of corrosive environment on corrosion fatigue crack growth (CFCG) behavior of oil-grade nickel-base alloy 718 is studied. The results demonstrate that there is no obvious effect of 3.5 wt.% NaCl solution at RT, 50 degrees C and 80 degrees C on CGCG rates while 21 wt.% NaCl solution at 80 degrees C produces a deleterious effect on CFCG rates compared to the ones tested in air. Potentiodynamic polarization results show that alloy 718 exhibits passive behavior in 3.5 wt.% NaCl solution, while pitting corrosion resistance decreases with increasing solution temperature. Nevertheless, alloy 718 shows active corrosion behavior in 21 wt.% NaCl solution at 80 degrees C. (C) 2014 Elsevier Ltd. All rights reserved.
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