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Surface Modification of Stainless Steel-304 Electrode. 2. An Experimental Comparative Study of Electrochemically, Hydrothermally and Chemically Modified Oxide Films

Dražen Marijan ; Center for Marine and Environmental Research, Ruđer Bošković Institute, P.O.B. 1016, HR–10000 Zagreb, Croatia
Renata Slavković ; INA-Naftaplin, Lovinčićeva b.b., HR–10000 Zagreb, Croatia
Marijan Vuković ; Center for Marine and Environmental Research, Ruđer Bošković Institute, P.O.B. 1016, HR–10000 Zagreb, Croatia

Sažetak

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 °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 opencircuit 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.

Ključne riječi

stainless steel-304; surface modification; oxide growth; passive oxide films

Hrčak ID:

132296

URI

https://hrcak.srce.hr/132296

Datum izdavanja:

1.12.1999.

Posjeta: 791 *