Abstract
316L SS alloy was tested under different applied potentials to study the susceptibility of this alloy to crevice corrosion. XPS measurements have been carried out to detect and define the products which formed on the surface of 316L SS in 3.5% NaCl at room temperature at applied potential = 200 mVSCE. The formation of Fe, Cr and Mo compounds were found, and these compounds play a great role in protecting the alloy which was found. The boundaries of the corroded area under washer teeth are in agreement with IR drop. The potentiodynamic technique is also studied to examine the overall corrosion behavior of 316L SS.
Highlights
316L SS is an austenitic stainless steel alloy containing at least 17% Cr with some alloying elements additions in varying concentrations
One of the localized corrosions is the crevice corrosion which occurs in narrow openings or spaces between two metal surfaces or between metals and non
The number of corrosion sets in 316L SS at applied potential 50 and 200 mVSCE is similar but the crevice corrosion attack on 316L SS sample at 50 mVSCE took more time to form which means the corrosion rate value for 316L SS at 200 mVSCE is higher than the value of corrosion rate for the same alloy at applied potential 50 mVSCE
Summary
316L SS is an austenitic stainless steel alloy containing at least 17% Cr with some alloying elements additions in varying concentrations. The susceptibility of 316L SS to localized corrosion depends on applied potential at the outer surface, electrolyte resistivity, crevice length, crevice opening dimension, pH value, oxygen in the crevice electrolyte and temperature [2]. CCS model assumes that the sole cause for the localized attack is related to compositional aspects, e.g., the acidification or the migration of aggressive ions into the crevice solution. These changes in the solution composition can cause breakdown the passivation film and promote acceleration and auto catalyzation of crevice corrosion [3]-[5]. The morphology of the corroded surface under the washer tooth was discussed
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