The Corrosion of Mn Coatings Electrodeposited from a Sulphate Bath with the Post-Treatment of Te(VI) Additive and Influence of Phosphate Post-Treatment on Corrosion Resistance

Manganese coatings are excellent for the cathodic protection of steel against corrosion. Although manganese is more electrochemically active than widely used protective zinc, exceptional resistance in neutral and basic media determined by film insoluble corrosion products, which forms on surface greatly suppresses its further It known that electrodeposition process Mn from sulphate electrolytes positively affected some additives chalcogenide (S, Se Te) compounds electrolyte. However, a detailed study properties electrodeposited bath with Te(VI) additive lacking. In this work, measurements free potential potentiodynamic polarization NaCl solution, as well obtained coatings, were evaluated salt spray chamber. was best shown at current density 15 A⋅dm−2 higher temperatures (60 80 °C). Meanwhile, phosphated room temperature bath, increased about 5 times reached up to 1000 h until substrate occurred.