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Low-temperature plasma assisted carburizing (LTPC) is an efficient method to provide improvement on surface mechanical properties of stainless steels, with a consequent improvement on its tribological behavior. The application of this treatment on martensitic stainless steels is recent and there are many aspects that deserves attention, including the treated surface corrosion resistance. Among various electrochemical techniques, critical pitting temperature (CPT) has been widely used to characterize stainless steels corrosion resistance due to its good reproducibility, sensitivity and efficiency. In this context, the purpose of this work was to apply LTPC thermochemical treatment on AISI 410 martensitic stainless steel, aiming to determine the influence of the treatment temperature in the treated surface microstructure, hardness and corrosion resistance employing TCP technique. The carburizing treatments were carried out at 300, 350, 400 and 450 °C during 6 hours, using a gas mixture containing 99.5% of (80% H2 + 20% Ar) + 0.5% de CH4 (in volume). The gas mixture flow rate and pressure were fixed at 1.67 x 10-6 Nm3s-1 and 400 Pa. The treated samples were characterized using X-ray diffractometry, optical microscopy, and microhardness measurements. The treated surfaces corrosion resistance was evaluated using OCP and CPT measurements. For the treated surfaces an increase in hardness and a displacement of XRD martensite peaks was observed, indicating that the carburizing processes were succeeded. The 1 Federal University of Paraná, Curitiba, Paraná, Brazil. 2 SENAI Institute of Innovation in Electrochemistry, Curitiba, Paraná, Brazil. 58 II S3IE 2016 – 2nd International Seminar on Industrial Innovation in Electrochemistry electrochemical tests have shown that the untreated sample presented higher corrosion rate after pitting formation. Nevertheless, for temperatures below CPT it presented the lowest current density. The treatment temperature that provided the best corrosion behavior was that treated at 350 °C, with corrosion current similar to the untreated sample before CPT. Results also indicated that there is a direct relationship between the LTPC temperature and the treated surface properties, especially corrosion resistance.

Critical pitting temperature on low temperature plasma carburized AISI 410 stainless steel