Coating method for elongated metal blanks

摘要

A method based on superfinishing for coating elongated metal blanks. The blanks have at least two axially aligned portions with varying cross-sections, wherein particles of a hard substance protruding from the surface of the coating are embedded into a metal lining in a chemical electroplating bath on the surface of a first portion provided with indentations or the like. The exposed surfaces of a second portion remain substantially devoid of hard surface particles, by a plurality of blanks being freely circulated in a rotating drum in a dispersion which is suspended in the electroplating wherein the hard substance particles adhering to the exposed surfaces are removed again by rubbing the blanks against each other.