Method and apparatus for continuously applying nanolaminate metal coatings

A method comprising:

• moving a workpiece through an electrodeposition cell of an apparatus at a rate, the electrodeposition cell comprising an electrode and an electrolyte comprising salts of at least two metals;
• and
• electrodepositing a nanolaminate coating on the workpiece by applying a time varying potential between the workpiece and the electrode, and repeatedly applying three or more different current densities of an offset current to the workpiece as it moves through the electrodeposition cell during the applied time varying potential, the offset current being such that the workpiece remains cathodic as it is moved through the electrodeposition cell and the electrode remains anodic.