Conversion electron Mössbauer study of low carbon steel polarized in aqueous sulfate and sulfite containing sulfate solutions

✍ Scribed by Cs. Vértes; M. Lakatos-Varsányi; W. Meisel; A. Vértes; P. Gütlich; L. Kiss

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 370 KB
• Volume: 38
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(93)85135-l

✦ Synopsis

A stract-The passivation of low car on steel was studied in aqueous solutions of 0 .5 M Na2 SO, (pH = 3 .5 and 6.5) and of 0.5 M Na 2 SO, + 0.001 M NaHSO, (pH = 3.5 and 6.5). The used conversion electron Moss auer spectroscopy (CEMS) with the complementary electrochemical, microscopic and spectrophotometric investigations proved that the presence of sulfite ion induces pitting corrosion . The compositions and thicknesses of the passive films formed during the electrochemical treatments are determined from the conversion electron Moss auer spectra . y-FeOOH was found in each case as a major component. At pH -3.5, the sextet elonging to Fe 3C appears in the spectra in most cases, and also FeSO, -H ,O could e detected after the shortest (90min) polarization time .