Process for applying a well-adhering, solderable metal layer to rapidly oxidising metals

摘要

A process is described with which a well-adhering, solderable metal layer can be applied to rapidly oxidising metals such as titanium, chromium or zirconium or their alloys. To do this, the materials made from the rapidly oxidising metal are freed from their oxide layer in a pickle which contains ions of the solderable metal, e.g. nickel. Preferably, the material is alternately immersed in the abovementioned pickle and in a pickle consisting of concentrated nitric acid or sodium fluoride in sulphuric acid. The metal layers thus produced can be applied e.g. before the soldering of the rapidly oxidising metals, but they can also be used as a substrate for further metal layers which are to be applied electrochemically.