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Pitting corrosion evaluation of austenitic stainless steel type 304 in acid chloride media

Loto, R. T. (2013) Pitting corrosion evaluation of austenitic stainless steel type 304 in acid chloride media. J. Mater. Environ. Sci., 4 (4). 448--459. ISSN 2028-2508

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The resistance of austenitic stainless steel type 304 to pitting corrosion was studied in solutions of sulphuric acid (2M and 5 M) with and without sodium chloride addition by linear polarization technique. The pitting and passivation potentials, corrosion rate and current density were analyzed with respect to the chloride ion concentration. Under anodic polarization the stainless steels in sulphuric acid solution acquired a passive state, with breakdown at the transpassive region (pitting potential), however this was greatly reduced with the addition of sodium chloride which led to a sharp increase in current at potentials significantly lower than the value that necessitates pitting in the acid media due to rapid breakdown of the passive film and development of local pits. Results obtained establish the dynamic relationship and interaction between the sulphate/chloride ion concentration and electrochemical potentials in the corrosion behavior of the ferrous alloy at ambient temperature.

Item Type: Article
Uncontrolled Keywords: Pitting, Corrosion, Stainless steel, Sodium Chloride, Sulphuric acid
Subjects: T Technology > T Technology (General)
T Technology > TJ Mechanical engineering and machinery
Divisions: Faculty of Engineering, Science and Mathematics > School of Engineering Sciences
Depositing User: Mrs Hannah Akinwumi
Date Deposited: 27 Oct 2016 13:06
Last Modified: 27 Oct 2016 13:06

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