METHOD FOR PRODUCING A METAL COATING

摘要

The invention pertain to a method for electrochemical deposition of a metal coating on a metal substrate using an ionic liquid as the electrolyte,which substrate comprises a first metallic element which is the main component of said substrate and said coating being mainly composed of a coating material, said coating material comprising a second metallic element, which method comprises the steps of: pretreating the substrate surface by subjecting the substrate to etching in an ionic liquid, which ionic liquid contains metal ions of the second metallic element, during said etching removing metal ions of the first metallic element from the substrate, which metal ions of the first metallic element after this removal are present in the ionic liquid, depositing a transition layer by electrochemical deposition in said ionic liquid,which ionic liquid contains metal ions of the first metallic element that were removed from the substrate during the step of 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 deposited transition layer on the substrate, depositing the coating on the transition layer by electrochemical deposition in an ionic liquid containing ions of the second metallic element.