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AISI 430 ferritic stainless steel is used as interconnects in solid oxide fuel cells. In order to improve the corrosion resistance of this steel under operation conditions of solid oxide fuel cells, a protective and conductive coating layer on the interconnects can be used. In this research, AISI 430 ferritic stainless steel was coated with electrolytic with manganese, cobalt and cerium oxide under different density densities (400, 500, 600 and 700 mA/cm2). The coated specimens were studied by scanning electron microscopy (SEM) with X-ray diffraction spectroscopy (EDX). In order to investigate the corrosion behavior of the coatings, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) tests was used in aqueous NaCl solution of 3.5%. The results showed that with increasing the current density, the coating became even more uniform. The results of electrochemical polarization showed that the coating produced at a current density of 600 mA/cm2 has a better corrosion resistance (0.186 μA.cm2) than the coatings produced at current density of 400 (2.06 μA.cm-2), 500 (1.767 μA.cm-2) and 700 (1.02 μA.cm-2). Also the results of electrochemical impedance spectroscopy showed that the capacity of coating produced at current density of 600 mA/cm2 (1.47E-4 Ω-1cm-2Sn) is lower in comparison with the coatings produced at current density of 400 mA/cm2 (2.5E-4 Ω-1cm-2Sn), 500 mA/cm2 (1.6E-4 Ω-1cm-2Sn) and 700 mA/cm2 (2.1E-4 Ω-1cm-2Sn) which indicating better corrosion resistance of produced coating at current density of 600 mA/cm2.

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In this research, pure zinc, Zn-SiC and Zn-TiO2 nanocomposite coatings were fabricated through pulse electroplating process from a sulphate bath. While pulse electroplating, the effect of several parameters like maximum current density (ip), frequency and duty cycle were investigated. In order to characterize the obtained coatings, surface morphology of the coatings was investigated by scanning electron microscopy (SEM & FESEM), composition of the coatings by elemental energy dispersive spectroscopy (EDS) analysis,  microstructure by means of X-ray (XRD) method, corrosion measurement by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS), surface topography by the use of atomic force microscopy (AFM) and also microhardness of  the coatings were investigated. The highest amount of incorporated SiC nanoparticles was 8.73 Vol. % and for TiO2 nanoparticles was 7.12 Vol. %. Also, minimum corrosion current density for pure zinc coating was 7.1, for Zn-SiC nanocomposite coating was 4.49 and for Zn-TiO2 nanocomposite coating was 4.53 µA/cm2. It was observed that utilization of simultaneous of composite coating system and also pulse electroplating process leads to significant increase in corrosion resistance. XRD analysis also showed that preferred orientation for pure zinc coating is through (002) plane. By incorporation of SiC and TiO2 nanoparticles into the zinc matrix, the intensity for (002) plane decreases and (101) plane intensity increases. Average roughness for three samples of Zn, Zn-SiC and Zn-TiO2 coatings was 528.11, 627.32 and 815.41 nm respectively. The microhardness of the coatings was also improved after SiC and TiO2 incorporation. 

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In this paper, the effect of anode arrangement is investigated on the applied current density in the cathodic protection system of reinforced concrete. For this purpose, two different arrangements of anodes with different number of anodes have been studied. The results indicate that the location of anodes relative to the rods in concrete has a significant effect on the current density. And the amount of applied current density for corrosion protection is a function of the anodes location. In the case where the anodes are parallel to the rods, a lower applied current density is required, and if the anodes are vertical to the rods, a higher current density is required for protection

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Platinum anodes, including platinum coating on the substrate of niobium, are used for electrolysis of sodium chlorate. Due to the high price of these anodes, their corrosion resistance in this environment is important. In this research the effect of current density has been investigated on corrosion the behavior of Pt/Nb anode. Platinum coating was deposited on the niobium substrate by electrodeposition method. The samples were then exposed to accelerated life test in chlorate electrolysis cell at current densities of 0.5, 1.2 and 2 A/cm2 for 3, 10, 40 and 70 hours at constant temperature of 35°C. Cyclic voltammetry and electrochemical impedance spectroscopy was done on the samples at each time extension. The samples finally were characterized using SEM. The results showed that at any current density, the solution in the vicinity of the anode is acidic and with increasing current density, the corrosion of the coating through the formation of chloroplatin complexes, from local to uniform, is converted at a high rate.As well as, it was revealed that the Pt/Nb anodes are deactivated in to two manners; Spontaneous dissolution of platinum coating and growth of passive layer or dissolution of coating together with passive layer. The electrolysis with current density of 1.2 A/cm2 is the best operating condition in which the platinum anode has its highest corrosion resistance, lowest destruction and optimum catalytic effect.