摘要:
An object of the present invention is to provide a method for preparing a plating solution for aluminum electroplating useful for the production of a high-ductility, high-purity aluminum foil at a high film formation rate, etc., which is an easy-to-handle plating solution that does not solidify and allows for an electroplating treatment even at 25° C. The present invention as a means for achieving the object is characterized in that in a preparation of a plating solution containing at least (1) a dialkyl sulfone, (2) an aluminum halide, and (3) a nitrogen-containing compound, the blending proportions of the dialkyl sulfone, the aluminum halide, and the nitrogen-containing compound are such that per 10 mol of the dialkyl sulfone, the aluminum halide is 3.5+n to 4.2+n mol, and the nitrogen-containing compound is n mol (wherein n is 0.001 to 2.0 mol). In addition, a plating solution for aluminum electroplating prepared by the method of the present invention allows for an electroplating treatment with high aluminum deposition efficiency relative to the current flow, and is thus advantageous in that electricity usage can be reduced, resulting in excellent economic efficiency.
摘要:
To provide a barrel electroplating method which is less prone to bare spots and adhesion failure such as blisters and peeling, and which makes it possible to obtain uniform plated coatings free from burnt deposits and poor brightness, irrespective of the amount of workpieces.The present invention provides a method for performing barrel electroplating by use of an aluminum or aluminum alloy plating bath, the method comprising rotating, swinging, or vibrating an anode (6) placed inside a barrel (4) receiving workpieces, and simultaneously rotating, swinging, or vibrating the barrel, with a voltage being applied between the anode and a cathode provided on an inner wall surface of the barrel.
摘要:
The invention relates to an apparatus (1, 101, 201) for electrochemically coating a workpiece (22), including a coating reservoir (2, 102, 202) with a charge opening (5) and a supply reservoir (3, 103, 203), wherein the two reservoirs are in communication through a passage opening (4, 104, 204). The apparatus has at least one electrode (11) and one counter electrode (14). In order to prevent contamination of a coating liquid (20, 120, 220) during an electrochemical deposition process, the apparatus can be switched between a coating position and a rest position by rotating the supply and the coating reservoirs about at least one common axis (A, A′, A″) so that the center of gravity of the volume of the coating reservoir (2, 102, 202) in the coating position is lower in relation to the center of gravity of the volume of the supply reservoir (3, 103, 203) than in the rest position. The invention further relates to a method for coating workpieces.
摘要:
The invention relates to organoaluminum electrotyles for the electrolytic deposition of aluminum which are characterized in that they consist of KF . 2 AlEt.sub.3 (A), KF . 2 AlMe.sub.3 (B) and MF . 2 Al(iBu).sub.3 (C), wherein M=sodium or potassium or a mixture of both, in a molar ratio of A:B:C of from 2:1:1 to 7:1:1. The organoaluminum electrolytes are dissolved in from 2 to 4.5 moles, based on the amount of MF employed, of an aromatic hydrocarbon which is liquid at 0.degree. C. The invention further relates to a process for the electrolytic deposition of aluminum on electrically conductive materials by using said electrolytes.
摘要:
The invention provides a high-purity electroaluminum layer having a purity of greater than 99.99% and, preferably, a thickness of 10 to 20 .mu.m which serves as a gas barrier layer, particularly for hydrogen, oxygen, tritium and water vapor, for metallic materials and nonmetallic materials such as glass, quartz, ceramic and cermets with an electroconductive surface as well as for conductive plastics. By post-treatment, the electroaluminum layer can be compacted. The electroaluminum layer is precipitated by electroplating from aprotic oxygen-free and anhydrous electrolyte media of the general formula M.sup.I X.2AlR.sub.3.nLsm, wherein M.sup.I is an alkali metal ion or a quaternary onium ion, X is a halogen ion, preferably F.sup.- or Cl.sup.-, R is an alkyl radical, preferably CH.sub.3, C.sub.2 H.sub.5, C.sub.3 H.sub.7 or C.sub.4 H.sub.9, Lsm is an aromatic solvent molecule, preferably toluene, ethyl benzene, xylene or a mixture thereof, and n=0 to 12, at a bath temperature of 50.degree. to 110.degree. C. and a current density of 0.5 to 10 A/dm.sup.2 under intensive bath agitation. Electroplating may be conducted in the presence of an aromatic solvent.
摘要:
Electrolytes and plating solutions for use in processes for electroplating and electroforming pure magnesium and alloys of aluminum and magnesium and also electrodeposition processes. An electrolyte of this invention is comprised of an alkali metal fluoride or a quaternary ammonium halide, dimethyl magnesium and/or diethyl magnesium, and triethyl aluminum and/or triisobutyl aluminum. An electrolyte may be dissolved in an aromatic hydrocarbon solvent to form a plating solution. The proportions of the component compounds in the electrolyte are varied to produce essentially pure magnesium or magnesium/aluminum alloys having varying selected compositions.
摘要:
In a plating bath for electrodeposition of aluminum, comprising a nonaqueous electrolyte using a eutectic mixture fusible at room temperature, the plating bath comprises a mixture of about 40 to 80 mol % of an aluminum halide and about 20 to 60 mol % of butyl pyridinium halide, or further comprises an organic solvent mixed in said mixture. This plating bath may not cause any color change of a coating into gray or black to assure white and uniform appearance, even when current density is increased to 30 A/dm.sup.2 or varied in the range from 0.1 to 30 A/dm.sup.2.
摘要:
An electrolytic bath for coating articles of aluminum and its alloys consists essentially of an aqueous solution containing an alkali metal silicate, a peroxide, a water-soluble carboxylic group-containing organic acid and a water-soluble fluoride. A vanadium compound may also be included in the bath whenever the coated articles are intended to be used for decorative purposes. In the process, the aluminum article is immersed in the bath and a voltage shock is applied thereto by imposing a voltage potential between the aluminum metal serving as the anode and a cathode immersed in the bath. The voltage potential is quickly raised to about 300 volts within about 2 to about 10 seconds and thereafter, the voltage is increased gradually to about 450 volts within a few minutes until the desired coating thickness is formed.
摘要:
An ionic liquid composition for the electrode position of metals and more particularly to compositions using non-aqueous organic electrolytic solutions.
摘要:
Aluminum or an alloy thereof is electroplated upon electrically conductive substrates by immersing the substrate as a cathode in a novel stable electrolyte, made by (a) reacting aluminum with a hydrogen halide or a halogen and hydrogen halide, in the absence of water, but in one of several organic, non-Lewis base solvents or mixtures thereof to form an intermediate aluminum halide cation in solution, the concentration of the aluminum cation and the concentration of hydrogen ion in solution being, respectively, below about 5.0 M and 0.4 M and preferably containing an aluminum cation concentration extending between 2.7 M and 4.2 M and a [H.sup.+ ] ion concentration extending between about 0.01 M and about 0.3 M, the exact maximum amount of [H.sup.+ ] ion concentration depending upon the aluminum ion concentration (there is a direct, substantially linear, relationship between the [Al.sup.+3 ] ion concentration and [H.sup.+ ] ion concentration); and (b) then adding a restricted amount, preferably less than about 16 mole% relative to the initial quantity of aluminum added, of a metal halide, MX where M=Li, Na, or K and X=Cl, Br, or I, or where MX is a special halide such as beryllium bromide, magnesium bromide, or quaternary ammonium bromide to form a different, stable aluminum cationic plating species.