Selective electrodissolution of AISI 304 stainless steel using eco-friendly NaCl-based electrolyte
DOI:
https://doi.org/10.5377/nexo.v37i2.19821Keywords:
Electrodissolution, Corrosion, Stainless Steel, Ethylene glycol, Sodium chlorideAbstract
Commonly, the standard electrodissolution procedure is carried out with acid-based electrolytes, generating environmental and safety problems. In this research, an environmentally friendly electrolyte composed of ethylene glycol, sodium chloride and water was used to selectively electrodissolve the surface of AISI 304 stainless steel. To evaluate its electrochemical behavior, wettability properties, surface characteristics and corrosion resistance in simulated sea water; voltammetry, contact angle, scanning electron microscopy and cyclic potentiodynamic polarization techniques were used respectively. Electrodissolution was carried out in an electrochemical cell with a three-electrode arrangement (platinum as counter electrode, Ag/Ag+ as reference electrode and a ½” AISI 304 stainless steel disc as working electrode). The results of the electrochemical and surface characterization tests indicate that the best electrodissolution conditions, 4V and 30 minutes, are achieved with an electrolyte composed of 10.14% m/m NaCl, 67.40% m/m EG and 22.46% m/m H2O. Under these conditions, a hydrophobic surface was obtained, with a 72.15% increase in resistance to pitting corrosion and a 96.71% reduction in the general corrosion rate, with respect to untreated AISI 304 stainless steel.
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