SU449107A1 - The method of electrochemical deposition of aluminum - Google Patents

Description

(54) METHOD OF ELECTROCHEMICAL DEPOSIT OF ALUMINUM

The invention relates to the field of elec1) chemical processing of metals, in particular, to electrochemical deposition of alcine. The known method of electrochemical deposition of alyushgai in ether-hydride electrolyte. According to the proposed method, imitating the coating, in the electrolyte, is subjected to an anodic treatment with an asymmetric alternating current with a ratio of the current density of the cathodic component to the current density of the anodic component of not more than 0.9 and anode current density of 7-50 moisture / s. This makes it possible to obtain the painted surface of the aluminum, as well as to combine the operations of coating and painting the surface without filling the surface layer of the dye or pigment. The method is carried out by electrochemical deposition of aluminum and in an eir-hydride electrolyte. After this, the product with the cover is subjected in the same electrolyte to anodic treatment with an asymmetric alternating current with a ratio of the current density of the cathodic component to the current density of the anodic component of not more than 0.9 and anodic current density of 7-50 mA / cm2. Electrochemical deposition. aluminum is carried out in the ether hydride electrolyte containing: Aluminum chloride (b / c), mol 1-2 lithium hydride (powder), mol 0.8-1 diethyl ether, the rest at room temperature, average cathode current density 15-20 mA / cm and the duration of the process bbo-gvo min. The cured coating has a thickness of from 20 to 25 volts. The average reflectance of an unpainted 7 white / algaline surface of R 45-70%. After anodic treatment, a fine black or gray layer is formed on the surface of the aluminum, which consists of an amorphous aluminum structure and is distinguished by hardness and strength. By external mechanical effects.

Example I. A copper sample is electrochemically immobilized in an eudar-hydride electrolyte of PSH of a cathode current density of 20 mA / cm2 for 65 sh. The thickness of the coating obtained is 25 microns. Switch

DC mode to asymmetric current with a ratio of the current density of the cathode component to the current density of the anode component of 0.3 and anode current density of 10 ma / cm. Processing time 5 min. The current is turned off. The surface of the sample acquires a uniform color. The thickness of the black layer is 2 microns. The microhardness of the treated coating is 96-98 kg / mm. The otoachin surface ratio

t about with

l 0.0 / b,

Precher 2. A steel sample is electrochemically coated in an ether-hydride electrolyte at a cathodic; current density of 20 mA / cm for 60 minutes. The thickness of the coating obtained; 25 microns. A direct current pesm / a is switched to asynketry current with a ratio of the current density of the cathode component to the current density of the anode component E) of 0.5 and anode current density of 30 mA / cm2. The current is turned off. The sample surface becomes uniform in color. The thickness of the gray layer - I 1ZH. Microhardness of the processed POKRYTCH 96-100 KG / MI-2.

The reflection coefficient of the painted surface is R 15.7.

ll ffirf FROM ORIGA

The method of electrochemical deposition of aluminum in an ether-hydride electrolyte, characterized in that from coating the coating, the coated article is subjected to anodic treatment in the same electrolyte with asymmetric alternating current with a ratio of the cathode current density to the anode current current density of not more than 0.9 and anode current density of 7-50ma / cm2.