Abstract
The initiation of fracture in passive films formed on a 304 stainless steel has been measured using a nanoindentation technique as well as bulk circumferentially notched tensile bars (CNTBs). The nanoindentation method was coupled with scanning probe microscopy to isolate individual grains that were free of any observable inclusions, so as to probe only the properties of the film upon the base alloy. The mechanical response of the film was measured while being anodically polarized in 0.1 M sulfuric acid with various halide concentrations, as well as with respect to the applied potential. The passive film strengthened as the applied potential increased in the passive regime, possibly due to film-thickness changes. In both the bulk and nanoscale tests, the passive film-fracture strength was found to decrease with increasing salt concentration in solution, which cannot be attributed to the uniform thinning of the passive film. The correlation between the bulk and nanoscale tests demonstrates that both methods are viable options of measuring the fracture of passive films on metals. Nanoindentation results are used to estimate the applied tensile stress at film fracture between 1 and 2 GPa for an anodically grown passive film on 304 stainless steel at 0 V vs that on Ag/AgCl in 0.1 pct NaCl-0.1 M sulfuric acid.
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Rodriguez-Marek, D., Bahr, D.F. & Pang, M. Mechanical measurements of passive film fracture on an austenitic stainless steel. Metall Mater Trans A 34, 1291–1296 (2003). https://doi.org/10.1007/s11661-003-0240-8
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DOI: https://doi.org/10.1007/s11661-003-0240-8