Behavior of plasma-sprayed spinel-coated steel substrates in chloride melt at 710 °C

Abstract

The behavior of plasma-sprayed spinel-coated low carbon steel substrates was studied for its wear in 2 M magnesium chloride in chloride melt at 710 ± 10 °C during electrolysis. The test electrodes were either placed at the bottom of the cell or used as the cathodes. Provided that thermal shock is minimized and high current densities are not applied when the substrate is used as a cathode, the spinel coat on the low carbon steel does not degrade in the hostile chloride melt containing chlorine, molten magnesium and sludge for over one 100 h. However, flaking of the spinel layer on prolonged use is imminent.