Abstract
To better understand the ability of conventional corrosion fatigue (CF) testing environments to estimate atmospheric CF performance, CF crack growth rates (da/dN) are measured in moist air in samples with surface salt deposits. Experiments show that samples loaded with 300 μg/cm2 of NaCl and exposed to 80% relative humidity exhibit a maximum da/dN similar to full immersion environments. Atmospheric da/dN is consistent with full immersion testing at low loading frequency (f), but differences arise at high f with atmospheric crack growth proceeding faster than 23.1 wt% NaCl despite surface electrolyte droplets having a predicted composition of 23.1 wt% NaCl.
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