The environmental crisis that has been lived in the last decades has generated a great interest for science to search new materials as ecological alternatives for different applications, and corrosion hasn’t been the exception, whence, there have been studied and developed organic compounds to work as corrosion inhibitors to several substrates and environments. Due to this, in this research is proposed the use of phenylalanine (Phe) to protect AISI 1018 steel in sweet brine as a biodegradable and ecofriendly option. Results in continuous immersion during 24 h with concentrations of 0, 10, 100 and 250 ppm show an inhibitor effect since the moment of contact. Nevertheless, it falls before 24 h and the failure is associated to the molecules agglomeration.
In a static system, the anticorrosive properties of the amino acids valine and isoleucine were determined as corrosion inhibitors in a sweet medium. With the use of electrochemical techniques EIS and Zsim software the electrochemical parameters and efficiencies of the amino acids were obtained, where the best results were obtained in an immersion time of 24 hours for both amino acids, in concentrations of 250 ppm for valine and 10 ppm for isoleucine.
The aim of this work is produced passive films of magnetite on the Ti6Al4V-Eli alloy surface and evaluated the influence on electrochemical properties by open circuit potential (OCP), electrochemical impedance spectroscopy (EIS) and polarization curves using Hank's physiological solution as a electrolyte. To obtain the magnetite films a FeCl3.6H2O (2 mmol) + FeSO4.7H2O (1 mmol) solution was used applying a potential of 1 V. Preliminary EIS results for bare metal show a lower Ztotal than Ti6Al4V-Eli+Fe3O4, however, both responses are affected by surface phenomena such as roughness or porosity characteristic of magnetite and surface preparation of Ti6Al4V. Finally, from polarization curves it was determined that the Ti6Al4V-Eli+Fe3O4 (with film) samples are more stable than the Ti6Al4V-Eli (bare), however, both samples not exhibit a pitting potential inside the polarization range applied.
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