Preparation method of stainless steel-based beta-PbO2-SnO2-CeO2-ZrO2 inertia composite anode material

Abstract

The invention provides a preparation method of a stainless steel-based beta-PbO2-SnO2-CeO2-ZrO2 inertia composite anode material. The preparation method comprises the steps of: firstly pre-processing a stainless steel based material, then immersing the stainless steel based material in an acidic system for etching and activating the stainless steel based material, and finally preparing the stainless steel-based beta-PbO2-SnO2-CeO2-ZrO2 inertia composite anode material through electrolytic deposition. The inertia composite anode material has an ash black surface, compact surface crystallization and plating thickness of 120-170mu m, and the binding force between the plating and a substrate is excellent. According to the method, the pollution of traditional lead and lead-base alloy anodic dissolution to a cathode chromium plating is avoided, and the quality of cathode products is improved; the electro-catalysis activation of the electrode material is improved due to addition of tin dioxide with good electro-catalytic activity and electrical conductivity, the cell voltage is stable, and power consumption is effectively reduced; the oxidization of trivalent chromium in an electroplating surface is effectively inhibited due to addition of zirconium dioxide, so that the stability of a plating solution is greatly improved, and the service life of the plating solution is greatly prolonged; and grains of the anode material can be refined due to addition of rear-earth oxide CeO2 so that the plating is more compact, and the corrosion resistance of the anode material can be effectively improved.

Description

Technical field [0001] The invention belongs to the technical field of metal surface treatment, and specifically relates to a stainless steel base β-PbO for trivalent chromium plating 2 -SnO 2 -CeO 2 -ZrO 2 Preparation method of inert composite anode material. Background technique [0002] Trivalent chromium plating is an emerging chromium plating process with the most research and development value and application prospects, and it is a research hotspot of a new generation of chromium plating technology. However, there are still many problems in the trivalent chromium electroplating process: (1) the composition of the plating solution is complicated, which is more sensitive to impurities and poor stability; (2) the trivalent chromium in the plating solution is easily oxidized at the anode and poisons the plating solution; (3) the cathode plating layer The color is darker and cannot be plated with thick chromium, and its hardness cannot reach the hardness of hexavalent chromium p...

AI Technical Summary

Problems solved by technology

However, there are still many problems in the trivalent chromium electroplating process: (1) The composition of the plating solution is complex, sensitive to impurities, and poor in stability; (2) The trivalent chromium in the plating solution is easily oxidized at the anode to poison the plating solution; (3) The cathode coating The color is dark, it cannot be plated with thick chromium, and its hardness cannot reach the hardness of hexavalent chromium plating

The main disadvantages are: (1) the formation of hexavalent chromium cannot be inhibited; (2) chlorine gas is precipitated in the plating solution during high current operation; (3) graphite is brittle, which is not conducive to processing; (4) the anode is easily damaged during electroplating The powder slag produced by dissolution enters the plating solution and pollutes the plating solution

However, DSA anodes cannot be applied on a large scale in the trivalent chromium plating process. The main reason is that the substrate of this type of anode must be a valve-shaped metal, such as: Ti, Ta, Zr, Nb, etc. Unstable binding force with the coating, resulting in shortened service life

Although some preparation processes for adding an intermediate layer have been reported, the further complexity of the production process also increases the cost, which restricts the large-scale production and use of this type of electrode, and is currently limited to laboratory research