Process for manufacturing electro-galvanized steel strip

In a process for manufacturing an electro-galvanized steel strip, which comprises:

• moving a steel strip in an acidic electro-galvanizing bath at a temperature within the range of from 35.degree. C. to 60.degree. C. containing cobalt and chromium in parallel with the plane of at least one anode plate and flowing said electro-galvanizing bath between said steel strip and said anode plate in a direction at right angles to the moving direction of said steel strip, and passing an electric current between said anode plate and said steel strip to provide an electro-galvanizing treatment, thereby forming, on at least one surface of said steel strip, an electro-galvanized layer having excellent bare corrosion resistance and excellent corrosion resistance after chromating;
• the improvement characterized by:
• keeping the cobalt content in said electro-galvanizing bath within the range of from 8 to 30 g/l, as converted into metallic cobalt, and the chromium content in said electro-galvanizing bath within the range of from 0.1 to 1.5 g/l, as converted into metallic chromium;
• and, flowing said electro-galvanizing bath between said steel strip and said anode plate at a flow velocity of at least 0.35 m/sec.