Electrochemical investigations of Cr-Ni-Mo stainless steel used in urology

• Published in: IOP conference series. Materials Science and Engineering Vol. 22; no. 1; pp. 012018 - 9
• Main Authors: Przondziono, J, Walke, W
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 01.05.2011
• Subjects: Anodic polarization; Chemical polishing; Chromium; Cold drawing; Corrosion resistance; Corrosion tests; Electrochemical impedance spectroscopy; Electrode polarization; Electropolishing; Materials science; Molybdenum; Nickel; Passivation; Passivity; Roughness; Stainless steels; Steels; Urology; Wire drawing
• ISSN: 1757-899X; 1757-8981; 1757-899X
• DOI: 10.1088/1757-899X/22/1/012018

The influence of chemical passivation process on physical and chemical characteristics of samples made of X2CrNiMo 17-7-2 steel with differentiated hardening, in the solution simulating the environment of human urine was analysed in the study. Wire obtained in cold drawing process is used for the production of stents and appliances in urological treatment. Proper roughness of the surface was obtained through mechanical working - grinding (Ra 0,40 μn) and electrochemical polishing (Ra 0,12 μn). Chemical passivation process was carried out in 40% solution of HN03 within 60 minutes in the temperature of 65°C. The tests of corrosion resistance were made on the ground of registered anodic polarisation curves and Stern method. For evaluation of phenomena occurring on the surface of tested steel, electrochemical impedance spectroscopy (EIS) was applied.