SU726218A1 - Acid electrolyte complex additive for producing tin based shine coatings - Google Patents

Description

54) COMPLEX ADDITION IN ACID BRILLIANT ELECTROLYT COATINGS FOR OBTAINING THE TIN BASED

synth amide-5-10, oxamine, laurylamine and quaternary salt, cl / l. 0,002-6

The complex additive is introduced into the acid (sulphate and hydrofluoric acid) electrolytes to precipitate covers with pure tin and a bismuth-fishing alloy.

In this case, the sulfate electrolyte contains 10-50 g / l of tin sulfate, 0.5-2 g / l of bismuth nitrate and 100-140 g / l of sulfuric acid and the process is conducted at room temperature, the current density is 2-20 A / dm and; moderate stirring

Hydrofluoric electrolyte contains 20-60 g / l of hydrogen fluorofluoride tin,. 0.5-2 g / l of bismuth nitrate, 100-140 ml / l of hydrofluoric acid and 20-30 g / l of boric acid and the process is carried out at room temperature, the current density is 2-8 A / dm. and moderate agitation. The proposed method is illustrated by the examples presented in the table.

The properties of coatings of tin bismuth alloys obtained from acidic electrolytes with our proposed surface-active substances (surfactants) are not inferior to the properties of precipitates obtained from a known electrolyte. In addition, low concentrations of new surfactant additives contribute to more ductile coatings due to a decrease in the amount of organic matter incorporated into the sediment.

The use of recommended surfactants facilitates the neutralization of wastewater due to the fact that the composition of the molecules of new surfactants does not contain benzene rings; Primary difficulty with biological cleansing. These new wetted substances contain linear or branched radicals and do not contain aromatic rings. Due to their use in small quantities, the effect of vaporization when the electrolyte is mixed is almost completely eliminated. The important advantages of the recommended electrolyte with new wetting surfactants also include the fact that in some cases, in particular, in sultamide-510 sulphate electrolyte, it is possible to obtain semi-bright coatings of tin-bismuth alloy without mixing the electrolyte and in a wider cathode current densities (1-15 A / dm), which is very important from a technological point of view. In addition, the use of recommended surfactants in acidic electrolytes to obtain shiny coatings with an alloy significantly increases the stability of the electrolytes (especially sepioacidic). Thus, when using new surfactants, acid electrolytes make it possible to obtain brilliant coatings of tin-bismuth alloy with a lower correction frequency (by a factor of 2-3) of the gloss-forming additive as compared with the known electrolyte.

Due to the fact that the above-mentioned cationic nitrogen-containing surfactants have a much higher adsorption activity on the cathode n6 compared with the recommended wounds of nonionic type surfactants, the luster-forming effect is achieved, at a much lower concentration.

Tin sulfate, g / l 10 Tin hydrofluoric acid, g / l Bismuth nitrate, g / l Sulfuric acid, g / l 140 Hydrofluorocarbide acid, ml / l Bornic acid, g- / l Brightening agent BOS-2, g / l Formalin (37 %), ml / l 10, 5 40

CH-iciH electrolyte, mode and results of evidence trolzna

Examples

С: and Pamil-5, MP / l Sy ig amn d - O, MP / l Okeamine, ml / l Laurylamine, ml / l Quaternary salt, 11T / l Current density, L / dm Duration, min Coating thickness, mkm Output on current,% Gloss,%

Claims (1)

Bismuth content in the alloy,% Formula of the invention The complex additive to acid electrolytes to obtain brilliant, tin-based coatings containing the BOC-2 brightener (condensation product of acetaldehyde and anisidine), formalin (37%) and wetting agent, characterized in that , in order to facilitate the process of neutralization of industrial wastewater, as it is. At the wetting agent, it contains a cationic nitrogen-containing surfactant from the group of ethylamines, anaphylamine including syntamide-5 and syntamide-510 (a mixture of polyethylene glycol esters of monoethanolamides of synthetic fatty acids of fraction 1 o samin and lauryl amine (a mixture of polyethylene glycol derivatives, a mixture of polyethylene glycol derivatives of fractional fatty acids, o and lauryl amine) mixture 0,002 0,350,15 ylsulfonate-1-methyl-1-polyethoxynol aliphatic amines) with the following ratio of components: Brightening agent BOC-2, g / l2-6. Formalin (37%), ml / l 10-30 Cationic. nitrogen-containing surface-active substance from the group of ethoxylated alkylamines, including syntamide-3, syntamide-510, oxamine, laurylamine and quaternary salt, ml / l 0.002-6 Sources of information, taken into account in examination 1, USSR Author's Certificate 84059, cl. C 25 D 3/32, 1975,