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Among the most important properties that orthopedic implants should have, is the corrosion resistance. The implants undergo a process of marking before being sterilized, whose function is to provide identification and traceability. This study evaluated the effect of two marking techniques, mechanical and laser, on the corrosion resistance of austenitic ISO 5832-1 stainless steel, the most commonly used material in Brazil on the manufacture of implantable medical devices. The electrochemical tests performed consisted of monitoring the corrosion potential in open circuit, electrochemical impedance spectroscopy, determining the electronic properties of passive film via Mott-Schottky approach, and cyclic potentiodynamic polarization measurements and scanning vibrating electrode technique (SVET) at the temperature of 37 ° C. The electrolyte used was a naturally aerated phosphate buffered solution, pH 7,4. Analyzes were performed by optical microscopy, scanning electron microscopy, SEM-FEG, and transmission electron microscopy. The results indicated that the laser marking process increases the susceptibility to pitting corrosion by significantly altering the characteristics of the passive film, as compared to the material without marks and mechanically marked. Oxide inclusions were observed placed into relief by the double incidence of the laser beam. The attack of the steel matrix surrounding the inclusions of oxides promotes the formation of micro-crevices between this and the inclusions favoring the growth and propagation of pits. This was the mechanism proposed to explain the increased susceptibility to localized corrosion in areas affected by the laser marking process.

Efeito da marcação na resistência à corrosão de implantes ortopédicos produzidos em aço inoxidável ABNT NBR ISO 5832-1