Чем можно загустить конц. серную/азотную кислоту до состояния геля?
Причем так чтоб оное обладало текучестью, чтоб можно было выдавить через шприц.

Чем можно загустить конц. серную/азотную кислоту до состояния геля?
Причем так чтоб оное обладало текучестью, чтоб можно было выдавить через шприц.

На даче есть остатки старого деревянного столба, основание которого зацементировано под землей.
Выкапывать лень, потому думаю просверлить отверстие, залить туда кислоты, и подождать пока сам развалится.
Но ствол в трещинах, потому нужно чтоб кислота медленно сорбировалась древесиной и не вытекала...

EXAMPLE 1

A series of tests was performed in a laboratory with the aim to study the NOx-reducing effect of urea in pickling agents and to study the long-time stability of pickling agents containing urea.

A saturated solution of urea in water (500 g/l) was manufactured and added to the existing pickling gel of the type 122 from the company Avesta Welding by adding given amounts of an urea solution to 100 ml of a pickling gel followed by a thorough stirring. The different concentrations which were tested as to pickling ability and NOx-reduction were then 20, 40, 80, and 160 g/l. The samples were stored in 250 ml plastic bottles with covers at a comparatively high room temperature (for the most part almost 30° C.) and partly directly in sunlight. The storage time varied from 24 hours to about two months in order to study the stability of the pickling gel in the presence of urea.

The pickling gel 122 from the company Avesta Welding, which was used in the tests, comprises 22 percent by weight of nitric acid, 5 percent by weight of hydrofluoric acid, 7.5 percent by weight of MgO, balance water.

In the tests performed, where urea had been admixed to the existing pickling gels, no consideration has been taken to the occurring dilution of the acids present in the pickling gel. The different concentrations, which were tested as to pickling ability and NOx-reduction, were as mentioned above, 20, 40, 80, and 160 g/l of urea, which corresponds to 4, 8, 16, and 32 ml, respectively, of urea solution and a dilution of equal percentage. It is difficult to compensate the dilution through reducing the amount of water in the pickling gel used as a starting agent. The dilution has, however, no direct influence on the pickling result, as the pickling efficiency increases when urea is present.

At the tests, each sample of the pickling gel was pencilled to form a layer, about 1 to 1.5 mm thick, on an oxidized sheet, 10×4 cm, of stainless steel (18-8 steel of the type 304), i.e. about 4 to 6 ml of the pickling agent was needed for each sheet. The amount of nitrous fumes, which were emitted at the reaction between the pickling agent and the metal/metal oxides, was measured by a chemical luminescence instrument. The measurement of the nitrous fumes continued during 45 minutes, and then the piece of sheet was cleaned by high pressure. Then, the sheet was dried and the pickling result appeared. As reference, the pickling gel of the type 122 from Avesta Welding without addition of urea, was analysed in three samples. The result of the reference samples, reported as maximum emission of NO, NO2, and maximum emission of NOx, is shown in Table 1. The difference between the NOx-values and the NO+NO2-values depends on inaccuracy in measurements.

Обратимо гидролизуется жидкой водой с образованием геля кремниевой кислоты и раствора гексафторкремниевой кислоты.