SU58095A1 - Method of preparing acidic electrolyte for tinning - Google Patents

Description

The inventor proposes a method for preparing an acidic electrolyte for conditioning in view of the difficulty of preparing an alkaline chemical electrolyte and the harmful effect of this chlorine.

The essence of the proposed method lies in the fact that, in order to obtain the sulfate of divalent tin in solution, tin dioxide (GnOg) is treated with concentrated sulfuric acid in the presence of reducing agents, for example, glue, sawdust, paper pulp n.

The process of preparing an acidic electrolyte for tinning occurs as follows. Tin dioxide is poured over with sulfuric acid (monohydrate), taken in an amount sufficient to dissolve, or in excess, depending on how much free acid is envisaged to be introduced into the bath according to the recipe. Vigorous stirring is carried out, B mixture is added, the mixture is recovered (glue, paper pulp, etc.) and heated. In case of mass tinning (gr) 15b: x of products, pulp should be replaced with sawdust.

tro.-shta 850 g of tin dioxide (SnOj). The latter in a large porcelain dish is washed with sulfuric acid monohydrate in the amount of 400 cm. Everything is thoroughly mixed and this mixture is supplemented with a reducing agent, which can be used as fiber (ordinary filter paper, chopped into pieces). B-mag is introduced into the KO.IM quality of 20 g, and everything is thoroughly mixed again. The cup is placed in a sand bath, and all the contents, while stirring, are boiled for 5-6 hours.

The greyish paste thus minced is introduced into a prescription sulphate sulphate in an electrolyte (volume 40 l).

If the applied recipe for sulphate electrolyte (o.t. shny) provides for K1eG1 as a component, then it can be introduced instead of cellulose, using serchoki.loh tin paste as prepared. At 40 j recommends a sn in: gcht 120 about a table, 1e, pound it in a mortar, brew in 200 d.n. oxen and 8 sile of paste, into a mixture of douoxide of tin and sulfuric CLS. The proposed method has the following advantages: I: Precipitated unstretched tin sulfate and possibly partially tin dioxide, as the electrolyte is depleted in tin ions, gradually dissolves, i.e., the electrolyte ions are replenished on the principle of dynamic equilibrium, due to which the amount entered Tin sulfate toothpaste Moss is increased accordingly. 2. The prepared electrolyte is rich in basic tin sol.1 and, therefore, in, it is a solution that provides a kind of complexation, i.e. the best conditions that guarantee the normal operation of the electroplating bath. 3. The refined electrolyte preparation recipe makes it possible to prepare a sulphate electrolyte for the purpose of mass tinning directly from tin stone, thus making the electrolyte cheaper. SPGs - Especially if one considers that the consumption of anodic tin is approximately 5-b times less than the consumption of such in a hot alkaline bath. 4. The electrolyte prepared in this way makes it possible to carry out the pushing in bell baths. that it has not been practiced until now, and the coating is so high-quality, especially for small products, that if it does not qualitatively exceed the coatings in hot alkaline baths, then at least it is not inferior to those. The subject matter of the invention. A method of preparing an acidic electrolyte for tinning, characterized in that, for example, in preparing a solution of divalent tin sulfate, tin dioxide (SnO-j) is treated with concentrated sulfuric acid in the presence of reducing agents, for example, glue, sawdust and . P.

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