Marijan, Dražen; Slavković, Renata; Vuković, Marijan
Surface modification of stainless steel-304 electrode. 2. An experimental comparative study of electrochemically, hydrothermally and chemically modified oxide films.
Croatica Chemica Acta, 72
Stainless steel-304 was modified electrochemically by potentiostatic and potentiodynamic methods (triangular and square-wave potential-time programs) in 1 mol dm(-3) NaOH solution, hydrothermally in 1 mol dm(-3) NaOH at 200 degrees C, and chemically in 0.5 mol dm(-3) K2Cr2O7 solution. Oxide films were characterized voltammetrically by the charge of Fe(OH)(2)/FeOOH surface electrochemical reaction. The stability of the oxide films was measured in 0.5 mol dm(-3) H2SO4 by anodic potentiodynamic polarization and by open-circuit potential-time measurements. The hydrothermally grown oxide film was most stable. The most efficient oxide growth was achieved by the use of square-wave type of modification. The oxide modified by this procedure exhibited lower stability than the oxide grown by triangular potential-time program, which was much more stable due to the uncompleted reduction of chromium oxide. The importance of careful control of experimental conditions, where a small change in surface treatment could lead to a significant change in corrosion behaviour, is pointed out.
||stainless steel-304; surface modification; oxide growth; passive oxide films
||NATURAL SCIENCES > Chemistry
||Division for Marine and Enviromental Research
|Project title||Project leader||Project code||Project type|
|Granica faza čvrsto/tekuće||Marijan Vuković||00981507||MZOS|
|Novi netoksični inhibitori korozije metala||Ema Stupnišek-Lisac||125012||MZOS|
||25 Nov 2013 09:09
||28 Feb 2014 12:11
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