High-quality Zn-Mn coatings with an Mn content reaching 50% are obtained fr
om citrate-sulfate solutions in pulsed electrolysis at a pulse length of 0.
1 ms to 1 s. Due to the formation of a blocking film of citrate-hydroxide z
inc compounds, cathodic potential increases with time, which helps reach a
codeposition potential of Mn ions. An electrolysis with a pulsed current su
perposed on a de increases the Mn content and makes no impact on the coatin
g quality.