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Corrosion Assessment of Carbon Steel Fasteners Coated with Nickel-Cobalt Using Electrochemical Noise Technique

In this paper corrosion kinetics was evaluated by Electrochemical Noise (EN) technique for carbon steel fasteners coated with nickel-cobalt (Ni-Co), immersed in synthetic seawater at 60°C and atmospheric pressure at Veracruz Harbor, Mexico. An electrochemical cell with a three electrode arrangement was used: two identical work electrodes and a reference electrode (saturated calomel electrode, SCE). An electrochemical study was performed to evaluate the applicability of this kind of materials in offshore submarine applications in the oil industry. In a general way, the smallest values of Vcorr were presented by the coated carbon steel. Potential and current transient analysis indicates that corrosion was dominated by a localized corrosion process. According to the obtained results, Ni-Co coatings provide both mechanical (by the hard coating of Ni-Co) and electrochemical protection and therefore can be used in a satisfactory way under submarine conditions.