Abstract
Surface imaging, depth distribution and mass spectra analysis features of Secondary Ion Mass Spectrometry has been utilized for investigating the corrosion mechanism in Type 304 austenitic stainless steel under different corrosive environments of H2SO4, HCl and HNO3 solutions of 10M each. Surface distribution analysis revealed non-homogenous distribution of alloying elements S, Cr, Mn, Ni and Fe in case of H2SO4 and HCl treated samples, which was due to the formation of corroded layer and its morphology. Depth distribution and mass spectra analysis revealed that oxides and hydroxides containing species are most abundant in H2SO4 treated sample followed by HCl treated sample. Surface distribution and mass spectra analysis indicated localized attack or pitting corrosion of chloride species in case of HCl treated specimen whereas in case of H2SO4 treated sample, attack of sulfur species was associated with an intensification of oxide and hydroxide species. Depth distribution analysis in case of HNO3 treated specimen concluded the formation of a passive layer enriched with Cr, Ni, Mn and Fe which causes the inhibition of corrosion process under the experimental corrosive parameters. The study also provides a methodology to investigate the type of chemical attack and to find out the root cause of corrosion utilizing various analysis features of SIMS technique.
Published Version
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