Autors: Tzaneva, B. R.
Title: Effect of pH on the corrosion behaviour of high nitrogen stainless steel in chloride medium
Keywords: corrosion resistance; pitting; high nitrogen stainless steel; pH; sodium chloride; galvanostatic; cyclic

Abstract: The general and pitting corrosion of austenitic Cr23N1.2 steel in 3.5% NaCl solutions have been investigated. The open circuit potential, the cyclic potentiodynamic and the galvanostatic methods have been employed in order to investigate the effect of pH (1-12) on the passivity and the tendency to pitting corrosion. Optical microscopy has been used to detect the surface sites for pit formation and the growth of pit nuclei. The results obtained for chromium–nitrogen steel have been compared with these for austenitic 304 stainless steel. The results from the galvanostatic method confirm these, received by potentiodynamic method that in the region of pH 2-10, the character of the environment has not an important influence on the protective properties of the passive layers formed in 3.5% NaCl solutions. In spite the similar electrochemical results, a considerable difference in the pit shape and the pit initiation sides is established.

References

    Issue

    Journal of Chemical Technology and Metallurgy, vol. 48, issue 4, pp. 383-390, 2013, Bulgaria, ISSN 1314-7471

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    Вид: статия в списание, публикация в издание с импакт фактор, публикация в реферирано издание, индексирана в Scopus