Electrochemical Evaluation of 15-5PH Stainless Steel Passivated in Citric Acid.

Most of the current aircraft are made of metal, which are exposed throughout their useful life to extreme meteorological conditions, defying the design factors in the aircraft, where the fight against corrosion has always been a determining factor. One of the protection methods used in aircraft components made of stainless steel is passivation. The study carried out consisted of the evaluation of 15-5PH stainless steel, passivated. Citric acid was used as passivating agent for passivation for 30 and 90 min with a temperature of 25 ° C. The electrochemical evaluation was carried out through the techniques of Cyclic Potentiodynamic Polarization Curves in the electrolytes of NaCl at 3.5% wt and H2SO4 at 1% wt.