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Interference film grown on stainless steel by pulsed current process using chromium free vanadate solution

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Figure 1: OCP curves in 0.5 mol/L NaCl for the bare steel (curve SS)  and previously colored samples in (Cr) 0.1M CrO 3
Figure 2: Potentiodynamic polarization curves obtained in 0.5 mol/L NaCl for the bare steel (curve SS)  and previously  colored  samples  in  (Cr)  0.1M  CrO 3  +  5M  H 2 SO 4 ,  (V) 0.5M  Na 3 VO 4   +  H 2 SO 4  5M  and  0.5M  Na 2 MoO 4   +  0.8M  CrO
Figure 3: Nyquist diagrams in 0.5 mol/L NaCl for the bare steel (SS curve) and previously colored samples in (Cr) 0.1M  CrO 3  + 5M H 2 SO 4 , (V) 0.5M Na 3 VO 4  +H 2 SO 4  5M  and (M) 0.5M Na 2 MoO 4  + 0.8M CrO 3  + H 2 SO 4  5M solutions
Figure  5:  Equivalent  circuits  for  the  corrosion  behavior of  (a)  the  bare  steel,  previously  colored  samples  in  (Cr)  0.1M  CrO 3  +  5M  H 2 SO 4  and  (M)  0.5M  Na 2 MoO 4   +  0.8M  CrO 3  +H 2 SO 4   5M  solutions  and  (b)  previously
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