Corrosion behavior of Ti3AIC2 in molten KOH at 700 °C

摘要

This paper investigated the corrosion behaviors of Ti3AlC2 at 700 °C in molten KOH with various mass ratios. If the mass ratio of KOH:Ti3AlC2≤, Ti3AlC2 can resist KOH hot corrosion in 2 h. Ti3AlC2 suffered serious corrosion attack if the mass ratio ≥3. The main compositions of corroded samples were amorphous graphite and potassium titanates (K2O→TiO2). If the samples were washed by acid and dried, potassium titanates could decompose to K2O and amorphous rutile. Based on the experimental results, a corrosion mechanism of Ti3AlC2 in molten KOH was proposed.