Influência do tratamento duplex a baixa temperatura com gaiola catódica de titânio na resistência a corrosão do aço inoxidável AISI 316L

Abstract

Stainless steel, particularly AISI 316L, is renowned for its remarkable corrosion resistance. When coupled with enhancements in surface properties, its potential applications are significantly expanded. A duplex treatment, comprising conventional nitriding followed by cage deposition, was applied, proving to be an effective method to enhance these properties. Titanium was chosen as the material for the cage due to its characteristics, such as high hardness, thermal and chemical resistance, as well as resistance to wear and corrosion. Thin film analysis was conducted through techniques such as scanning electron microscopy, Rockwell C adhesion, Energy-Dispersive X-ray Spectroscopy, and electrochemical corrosion tests. All samples exhibited satisfactory adhesion results and an increase in microhardness. The NCDT350 and NCDT400 samples showed minimal loss of corrosion resistance. Remarkably, in certain tests, the NCDT350 sample demonstrated improvements in corrosion resistance, standing out as the one providing the best combination of corrosion resistance and surface hardness.