Corrosion Studies On Ss-321 In Natrium-Hydroxide Solution

Marzuki S., Heri Jodi, Nurdin Effendi


Corrosion Studies On Ss-321 In Natrium-Hydroxide Solution. Experimental corrosion
studies on commercial SS-321 have been carried out. The experiments were carried out in a sodium
hydroxide medium with a concentration variation of 0.4 M. 0.5 M, 0.6 M, and0.7Mcorresponding topH
values of 13.6, 13.69, 13.78, and 13.84 respectively. The experiments were carried out using a type ofM-
273 EG&Gpotentiostat/galvanometer test instrument. The post-corrosion samples' microstructure were
analyzed with the aid of EDS (energy dispersive spectroscopy) equipped SEM instrument to detect the
presence of any viable corrosion byproducts. Forfurther verification x-ray diffraction method was also
used to detect any possible emerging corrosion byproducts on the samples' surfaces correlated to the
SEM-EDS result. Experimental results confirm that A1SI-321 commercial alloys immersed in a natrium
hydroxide corrosion medium with a variation of concentration experience very little or almost no
corrosion, so that according to the so-called Fontana's criteria these test-materials turn out to have an
excellent resistance toward natrium hydroxide corrosion. This is also evidenced by the very low corrosion
rate value measured in this study. EDS study and X-ray diffraction results indicate that the possible
ensuing corrosion byproducts are iron oxides, chromeoxides and silicon oxides.

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