SU1027290A1 - Cadmium plating electrolyte - Google Patents

Description

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cc The invention relates to electroplating, in particular, to electrolytes for applying protective and decorative cadmium coatings. A cadmium electrolyte containing cadmium sulphate, sulfuric acid and a surface-active additive - wetting agent CB-1X7 CO is known. The disadvantage of this electrolyte is low scattering ability at an insufficiently high level of current output values. The closest to the invention in terms of technical importance and the effect achieved is cadmium electrolyte containing cadmium sulfate (iH;

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(il () io-ll - liH2t OC, /, W29

1i The following ratio of components, g / l: Cadmium sulfate SSO Sulfuric acid: (density 1.8) -5 Ammonium bischetvertichny salt decamethylene-t, 10. bis (dimethylcarbtetradecycloxymethylammonium) -dichloride 8-tO The process is carried out at 18-28 C and a cathode current density of 1-2 a / dm. The electrolyte is prepared by sequential dissolution of the components in water. The freshly prepared solution does not require working out under the current and is quite stable in operation. Synthesis of the additive is carried out in Leddued way. 32.0 g (0.11 g-mmol) of tetradecyl monochloroacetate is dissolved in 150 ml of absolute ether and mixed with 11, g of V0.05 g-mol) N, N, N, N tetramethyl decamethylenediamine. The mixture is heated for 2 hours, then left to crystallize over

2bG, mission, sulfuric acid and syntanol DS-10 C2J. However, this electrolyte also has an insufficiently high scattering ability. The purpose of the invention is to increase the scattering ability of the electrolyte. This goal is achieved by the fact that the electrolyte containing cadmium sulfate / th, sulfuric acid and surface-active additive, as the surface-active additive contains ammonium bischvertichny salt, decamethylene-1, T0-bis (dimethylcarbtetradecyclic x-methyl-ammonium) -dichlo salt 8 h, after which the precipitate is filtered and dried in a vacuum desiccator. For recrystallization, the resulting material is dissolved in absolute alcohol, from which it is precipitated by the addition of absolute ether. The yield is 27.2 g. The ammonium bischetvertis salt C46H94Na additive introduced into the electrolyte is a micelle-forming ionic surfactant which, adsorbing on the surface of the cadmium electrode, forms a dense adsorption film, as a result of which the polarization sharply increases with the release of cadmium, which contributes to the formation of fine crystalline precipitation. Electrodeposition of CZDmi leads to 3 of electrolytes, the compositions of which, as well as the modes of carrying out the processes and the physicomechanical properties of the obtained coatings are tabulated. The coatings adhere well to the core and do not peel off when the specimens are bent before breaking.

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Claims (1)

Cadmium electrolyte containing cadmium sulfate, sulfuric acid and a surfactant additive, 'characterized in that, in order to increase the dispersing ability of the electrolyte, as a surfactant additive, it contains a decamethylene-Ί, 10-bis ammonium-free salt ( dimethylcarbtetradecyloxymethylammonium) -dichloride with the structural formula r L ^! 1 · 1 in the following ratio tov, g / l: Cadmium sulfate Sulfuric acid (density 1.84) Ammonium bis-quaternary salt of decamethylene - 1,10bis (dimethylcarbt etradecycloxy methyl mmonium) -dichloride 45-50 4-5 8-10