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    STUDIA CHEMIA - Ediţia nr.Special%20Issue%201 din 2009  
         
  Articol:   STUDY OF THE EFFECTS OF MINOR ELEMENTS ON THE ELECTROCHEMICAL BEHAVIOUR OF CAST LOW ALLOY STEELS IN A MOLAR SOLUTION OF SULFURIC ACID.

Autori:  . 		 
       
         
  Rezumat:  Fifteen low alloys steels were synthesized by induction foundry under argon atmosphere, with varied chemical compositions. In their as-cast states they were immersed in a H2SO4•1M solution and subjected to electrochemical measurements: polarization resistance and cyclic intensity-potential curves. All steels were logically in an active state, with low polarization resistances, low open circuit potentials and high corrosion currents. However they were all able to reach passivation for applied potentials high enough, but they fell again in the active state in the potential-decreasing part of cyclic polarization. Nevertheless, some differences were seen between the corrosion characteristics of some of these steels. The presence of niobium, tantalum and vanadium tend to lower the corrosion rate in the active state as well as they facilitate passivation. Niobium seems having a particularly strong beneficial effect on the corrosion rate of such steels both in the active state and in the passive state.

Keywords: low alloy steels, molar sulphuric acid, electrochemical behaviour, minor alloying elements
  
         
     
         
         
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