Abstract
In the aeronautical industry, the effects of corrosion are reflected in high costs of maintenance and equipment inactivity, as well as in safety risks for personnel. Modern aircraft are manufactured using different types of metal alloys, for example, civil aircraft are constructed with heat-treated aluminum alloys and military aircraft with titanium alloys and stainless steels. The objective of this study is to use electrochemical techniques to determinate the layer passivate of stainless steel (SS) 304, 17-4PH, and 15-5PH. Passivation of the SS was performed in 15% citric acid at temperatures of 25 and 49 °C. The corrosion kinetics was obtained using the electrochemical technique as potentiodynamic polarization curves (PPC) in a three-electrode system: the electrolytes used were sodium chloride (NaCl) and sulfuric acid (H2SO4). Passivation in citric acid allows obtain passive layers at temperatures of 49 °C with immersion times of 30 min. Precipitation hardening steels allow to obtain passive layers up to 360 mV in sodium chloride (NaCl), and in sulfuric acid there is a mechanism of passivation-transpassivation-secondary passivation, this due to the high electropositive values of potential above 1000 mV.
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