Pitting corrosion on FeCr and FeCrNi alloys

On the Propagation of Open and Covered Pit in 316l Stainless Steel

“…Indeed, for a 3 M NaCl solution (corresponding to the higher NaCl concentration used in this paper) injected in a 40 mL sulfate solution with the microcapillary, the chloride concentration was 0.4 mM after 1 hour of injection and it reached 4 mM after 10 hours, that is for the longest pit propagation studied. By comparison, it was shown that the minimum concentration of chloride necessary for initiating pitting was 100 mM for a Fe-20Cr steel [30], which is by far, much larger than the present chloride bulk concentration. The precise positioning of the microcapillary was achieved by measuring the electrolyte resistance between the substrate (i.e.…”

Corrosion of martensitic stainless steel in ethanol-containing gasoline: Influence of contamination by chloride, H 2 O and acetic acid

“…In our experiments, pitting corrosion took place already in solutions of 10 ppm Cl − (≈0.21 mmol/l chloride concentration). This Cl − -concentration is extremely low, considering critical Cl − -concentrations reported in the literature for pitting of stainless steels in aqueous solutions: for instance 69 mmol/l for Fe-11.6%Cr and 100 mmol/l for Fe-20%Cr [67]. Even though the steels studied in the earlier work in the aqueous solutions and in our present case are not identical, it is striking that the here reported value of 10 ppm (≈0.18 mmol/l) chloride to trigger pitting corrosion of a 13% Cr-containing steel in EtOH/gasoline mixture is ca.…”

Influence of the Electrolyte and Alloy Composition on the Pitting Behavior of Stainless Steel Alloys

“…In most work on the pitting of metals, Clhas been used as the aggressive anion, and although the minimum concentration of the aggressive ion has been reported, [8][9][10][11] the data are limited mainly to Fe and FeCr alloys. Data in the present paper will include Fe18Cr and Fel8CrMoN/W alloys.…”