The invention discloses a high-efficiency environment-friendly
pulse plating metallurgy method for performing thick
chromium plating based on trivalent
chromium in a
sulfate system. The method is characterized by comprising the following steps: dissolving
rare earth oxides in an acid, so as to obtain a rare-earth
salt solution; dissolving
chromium sulfate salt, aluminum
sulfate,
boric acid, a complexing agent and
methanol with water, and adding the rare-earth
salt solution, so as to obtain a chromium sulfate salt-aluminum sulfate-
boric acid-complexing agent-
methanol-rare-earth salt plating solution;
electroplating a to-be-plated plating piece into the
electroplating solution; controlling the
electroplating process conditions as follows: the distance between a
pulse electroplating power supply and a plating tank is 2-3m, a wire refers to a multi-stranded core wire, and an
anode refers to a Cu-matrix
coating electrode plate; the
current density of a connecting wire is 28-90A / dm<2> and needs to be far higher than the
average current, the pH value of the electroplating solution is 2-4, the temperature refers to 25-60 DEG C, the stirring speed is 100-600rpm, the plating time refers to 30-90 minutes, the
pulse frequency refers to 100-500Hz, and the duty ratio is 5-100 percent; and washing the plating piece subjected to complete electroplating, and airing. The method disclosed by the invention has the advantages of
coating flatness and compactness, good adhesiveness,
high current efficiency, high environmental friendliness and the like.