Corrosion behaviour of nanolaminated polycrystalline Ti₃SiC₂ in acidic media

Abstract

The corrosion characteristics of polycrystalline samples of Ti₃SiC₂, fabricated by two different powder production techniques, namely hot isostatic pressing (HIP) and hot pressing (HP), were investigated electrochemically by potentiodynamic testing. The corrosion behaviour of this material was studied in dilute HCl electrolytes. The effects of solution molarity and production technique were studied. The corrosion rate of HIP Ti₃SiC₂ was strongly affected by HCl concentration and the degree of attack reached a maximum at 2M HCl, which was the highest concentration used. Furthermore, HP samples showed less corrosion resistance to HCl than HIP samples. This is attributed to the finer grain size produced by HP. The corrosion rates of Ti₃SiC₂ and Hastelloy C are of the same order, whereas that of carbon steel is greater than that of HIP Ti₃ SiC₂ by ∼1000 times.

Keywords:

• TI3SIC2
• HOT PRESSING
• HOT ISOSTATIC PRESSING
• CORROSION BEHAVIOUR
• POWDER METALLURGY