Method for producing a metal coating

A method for electrochemical deposition of a metal coating on a metal substrate, wherein the metal substrate comprises a first metallic element as a main component, the method comprising:

• pretreating a surface of the metal substrate by subjecting the substrate to etching in an ionic liquid, wherein the ionic liquid contains metal ions of a second metallic element, during said etching removing metal ions of the first metallic element from the metal substrate, wherein the metal ions of the first metallic element are received by the ionic liquid;
• depositing a transition layer on the metal substrate by electrochemical deposition from said ionic liquid, wherein the ionic liquid contains the metal ions of the first metallic element that were removed from the metal substrate during the etching and metal ions of the second metallic element, both the metal ions from the first metallic element and the metal ions of the second metallic element being incorporated in the transition layer that is deposited on the metal substrate;
• and
• depositing a coating on the transition layer by electrochemical deposition from an ionic liquid containing ions of the second metallic element,
• wherein a flow of the respective ionic liquid is provided over the surface of the metal substrate during the deposition of the transition layer and during the deposition of the coating, wherein a velocity of the flow of the ionic liquid relative to the surface of the metal substrate is less than 1 m/sec.