Investigation of corrosion behaviour of boronised cold rolled high manganese steel

Corrosion behaviour of boronised high manganese steels (HMS) was investigated in this study. Pack-boronising was processed at 950°C, 900°C and 850°C for 2 h, 4 h, and 6 h. Boride layers of HMS unpredictably exhibited saw-tooth morphology. FeB, Fe2B, MnB and SiC phases were determined by XRD analyses. The increase in boronising temperature and time caused an increase in boride layer thickness. Although the corrosion rates were lower in boriding processes at 850°C, the corrosion rate of most of the samples boronised at 900 and 950°C was higher than the un-boronised HMS due to micro-cracks and pores formed in the boride layers.