Synthesis and electrochemical characteristics of Ta–N thin films fabricated by cathodic arc deposition

Niobium addition enhancing the corrosion resistance of nanocrystalline Ti5Si3 coating in H2SO4 solution

“…In order to provide "quantitative support" to the experimental EIS results, impedance data were fitted to appropriate EEC using the ZSimpWin software. The equivalent circuit model with two hierarchically distributed time constants is generally used to describe coated systems [28,33,42,43]. In the present case, the wide phase angle maxima observed in the Bode plots of the three coatings validates the involvement of two overlapping time constants [43,44].…”

“…The former represents the charge transfer-controlled reaction, whereas, the latter reflects a diffusion-controlled mechanism, also known as Warburg diffusional behavior [42]. Furthermore, two time constants are well distinguished in the Bode plot, implying the existence of defects in the coating surface [33]. As shown in Fig.…”

“…EIS has been broadly employed for the study of electrochemical behavior of coated systems in aqueous corrosive environments [33][34][35]. By measuring the impedance response of specimens to small AC potentials, much information on the corrosion reaction, the mass transfer and the electrical charge transfer can be obtained.…”

Investigation on Corrosion Behaviour of ZrN Thin Films in Industrial Environment

“…The icorr values of the coatings in the anodic region are lower than stainless steel indicating protection of substrate. [7] As observed in Polarisation curve, in cathodic polarization region the coated samples starts at a current lower than the stainless steel, but near the corrosion potential the coated sample current increases until it becomes almost equal to that of stainless steel. This phenomenon can be explained by pitting of the coatings at defect sites.…”

“…In the present test the icorr value obtained for all the thickness is always less than bare Stainless steel substrate indicating protection of substrate. [14] Surface image of the 1.5μ ZrN coated alloy after corrosion tests is shown in Fig 3.The EDX indicates the intense peak of Zr, and less intense peaks of Fe, Mn. The coating system at 100X shows few very small and shallow pits.…”