The Corrosion Behaviors of Hot-dipping Aluminium Steel in Na₂S Solution

A hot dipping aluminum steel was prepared. By static weight-loss tests, electron probe microanalysis and X-ray diffraction analysis, the corrosion behaviors of hot dipping aluminium steel, aluminium and carbon steel in Na₂S solution were studied. The results showed that with the increasing of Na₂S concentration in Na₂S solution, the outer layer (Al₂O₃ and Al) of hot dipping aluminium steel dissolved and uniform corrosion occurred, while carbon steel had a decreasing uniform corrosion and pitting. The pure aluminium had pitting corrosion in low concentration Na₂S solution and serious peeling corrosion in high concentration Na₂S solution.