Abstract

TORRES-LUQUE, Magda  and  OLAYA-FLOREZ, Jhon Jairo. Effects of Electrolyte Temperature on the Corrosion Resistance of Chromium Nitride, Hard Chromium and Epoxy Paint Coatings. Ing. Univ. [online]. 2013, vol.17, n.1, pp.109-125. ISSN 0123-2126.

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 magnetron sputtering system (UBM) with industrial metallic coatings of hard chromium and organic epoxy paints. All coatings were deposited over 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 °C to 80 °C, and vice versa, with an interval of 20 °C and taking measures every 24 hours. In general, organic coatings presented the least degradation in the time of the experiment; nevertheless, 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.

Keywords : Corrosion; impedance; coatings.

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