Abstract

Roland Tolulope Loto*

DOI : http://dx.doi.org/10.13005/ojc/350330

Stainless steels are extensively applied in diverse industries due to their exceptional corrosion resistance. The corrosion resistance of alloy stainless steels (316L austenitic and 430Ti ferritic stainless steel) was studied in neutral chloride solutions with chloride concentrations of 1%, 2%, 3%, 4%, 5% and 6%. Their general and localized corrosion resistance were compared and discussed in addition to their passivation characteristics. Corrosion rate results obtained showed 430Ti exhibited slightly greater general resistance to chloride attack compared to 316L. Further investigation showed 316L steel exhibited higher resistance to localized corrosion attack to its resilient passive film. 430Ti exhibited cathodic and anodic passivation compared to 316L which only exhibited anodic passivation. Optical microscopic analysis showed the presence of small, superficial corrosion pits on 316L steel compared to 430Ti, which exhibited deep corrosion pits.

Corrosion; Pitting; NaCl; Steel

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