Characterisation and anti-corrosion property of Ti conversion coating on manganese surface

Abstract

To solve the problem of chromium pollution in electrolytic manganese industry, a novel Ti conversion coating for electrolytic manganese was found to improve its anti-corrosion property. The excellent Ti conversion coating was formed on manganese surface under the optimized conditions of Ti 4+ concentration: 0.01 mol L −1 , H 2 SO 4 concentration: 4.60 g L −1 , H 2 O 2 concentration: 60 ml L −1 and immersion time: 20 s. The results of the electrochemical test exhibited that the Ti conversion coating can work well in inhibiting the Mn from corrosion, and the corrosion current density was obviously dropped from 3.52×10−4 to 7.97×10 −7 A•cm −2 . The results of XPS showed that the main composition of the conversion coating was MnO 2 , Mn 2 O 3 and TiO 2 , and the formation mechanism of the Ti conversion coating was revealed.

Fabrication and corrosion resistance research of stearic acid-doped silane composite passivation film on electrolytic manganese

“…However, the wastewater in this corresponding process containing hexavalent chromium and phosphate enrichment, results in serious water pollution [12], hazarding human health, and severely going against the requirements of environmental protection. Therefore, researchers have been exploring the various of environmentally friendly passivation films with excellent anti-corrosion effects, such as molybdate [13,14], silicate [15,16], titanate [17,18], vanadate [12,19,20], rare earth salt [21][22][23] and so on. For instance, Qiu et al [18] successfully prepared a titanium passivation film on the surface of electrolytic manganese by adjusting the conditions of the titanium solution, and its corrosion resistance is better than that of the Cr coating.…”

“…Therefore, researchers have been exploring the various of environmentally friendly passivation films with excellent anti-corrosion effects, such as molybdate [13,14], silicate [15,16], titanate [17,18], vanadate [12,19,20], rare earth salt [21][22][23] and so on. For instance, Qiu et al [18] successfully prepared a titanium passivation film on the surface of electrolytic manganese by adjusting the conditions of the titanium solution, and its corrosion resistance is better than that of the Cr coating. John et al [24] applied the sol-gel method to prepare a new chitosan titanium dioxide (CS/TiO 2 ) nanocomposite coating with excellent corrosion inhibition on mild steel.…”