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Keywords
impedance
coatings
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Abstract
This paper compares the influence of the temperature of the electrolyte in corrosion resistance of ceramic coatings of Chromium Nitride (CrN) produced with the unbalanced magnetrons puttering system (UBM) with industrial metallic coatings of hard chromium and organic epoxy paints. All coatings were deposite dover A36 carbon steel. The evaluation of corrosion resistance was determined through electrochemical impedance spectroscopy (EIS) in a 3% sodium chloride solution. For this purpose the temperature of the electrolyte was varied from 20 ºC to 80 ºC, and viceversa, with an interval of 20 ºC and taking measures every 24 hours. In general, organic coatings presented the least degradation in the time of the experiment; never the less, by the time the temperature cycle was over, the corrosion resistance was similar in the organic coatings and the ceramic ones. This paper discusses the corrosion mechanisms for each of the coatings produced.
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