Effects of Prior Chemical Treatment in a Nitric Acid, and a Weak Perpendicular to the Surface Heterogeneous Magnetic Field on the Corrosion behavior of AISI 316L Austenitic Stainless Steel, Intended for Use as an Implant, in Chloride Solution

Abstract

Prior chemical treatment in an aerated 65 wt % nitric acid solution (PCTNA), and weak permanent heterogeneous magnetic fields perpendicular to the surface WPHMFP effects on corrosion behavior of AISI 316L alloy in immersion in 0.9 wt % NaCl containing 0.1wt % glucose solution, proposed to use as an implant, have been studied. A PCTNA coupled with reduces localized corrosion during the immersion in a chloride solution. A PCTNA induces the formation of Al₂O₃ and SiO₂ oxides on the surface in absence of magnetic field and Al₂O₃ containing nitrogen in presence of WPHMFP. The corrosion in the presence WPHMFP during the rest potential and current–potential test increases the rest potential, and cancels the electrochemical noise (EN) on the rest potential curve during the first 4 h of immersion in nitric acid solution, withdraws the EN in anodic domain of polarization curves, remove the intergranular corrosion observed after polarization test following the first hour of immersion, and reduces the localized corrosion. The WPHMFP effects are almost removed after 3 days of immersion in nitric acid solution. The corrosion in chloride solution, after chemical treatment in the presence or in the absence of magnetic field, and the corrosion in a chloride solution in presence of magnetic field and without prior chemical treatment induce AgCl deposition on the surface of AISI 316L alloy after its dissolution from the Ag/AgCl reference electrode.