Increased metallic character of electrodeposited Mn coatings using metal ion additives

Small amounts of metal ions (Sn2+ or Cu2+) added to an electrolyte for Mn electrodeposition increase the metallic character of amorphous Mn coatings grown at high current densities. The codeposited oxygen decreases from 54 atom % to less than 7 atom %, while the codeposited Sn or Cu are below 1 and 3 atom %, respectively. The resulting amorphous coatings exhibit very different mechanical properties and better corrosion resistance than those of amorphous manganese coatings electrodeposited without metal ion additives. (C) 2004 The Electrochemical Society.