SU454105A1 - Flux for soldering and tinning - Google Patents

Description

The invention relates to punk, in particular, to flux for soldering and tinning with soft solders of predominantly printed circuit boards in the electrical, electronic and other industries. The known composition of the flux on smallpox rosin with the addition of active ingredients, containing P1, i, wt. %: Rosin15-30 Salicylic acid 3-3.5 Triethanolamine1-1,5 Ethyl alcohol81-65. This flux has a corrosive effect on paired products due to poor removal of adjuvants during the soldering process, and also has a low rate of tinning and nike. The purpose of the invention is to create a flux, allowing the increase in the rate of tinning and soldering while reducing the corrosive effect on the melted products. This is achieved by introducing crystalline iodine dissolved in ethyl alcohol into the rosin flux as the active component. In the process of soldering or tinning, iodine sublimates without showing a residual corrosive effect. The proposed composition of the flux contains,%: Rosin 10-40 1-1od crystalline 0.01- 0.001 Ethyl alcohol 59,999-89.99 The flux is prepared by introducing, under stirring, dropwise dissolved in 1 nt of iodine in an alcohol solution of rosin to obtain the composition of the flux of a given activity (iodine). The activity of the resulting composition can be determined by the usual analytical method by reaction to free under. Similarly, fluxes based on glycerol and others can be made by incorporating iodine into their composition as an active component of the flux. The proposed flux can be used, for example, in technological processes of group soldering of CEA. The flux is non-corrosive, as in the process of tinning and soldering, iodine is removed by means of combustion. Ethyl or isopropyl alcohols can be used as diluents. Removal of flux residues after soldering and tinning can be performed with ethyl or isonropyl sprits, alcohol-gasoline mixture (1: 1), freons, azeotronic compositions based on freons and ethyl, isopropyl3

alcohol and other organic solvents.

The flux is stored in dark glass vessels and, as necessary, its activity is corrected by adding a syrt solution of iodine or heating, the iipji of which iodine is stimulated.

A specific example of a flux based on rosin can be a composition.

about/.

containing in weights of Rosin

thirty

0,005 P1od crystalline 09,995. Ethanol

4 I p with d m s 1 15 i О and rec eti

 for uafiK) and tinning, containing caInfol1) li an ethyl residue that differs. From the colony to the loviueni of the activiosgus flu1 / kei corro,) Ionnog () was recovered on 1R41I;: iodine was present in the room and the ocrajibHBic comioioggi were taken from the following, 1% ratio;

10-40

Rosin Snirt ethyl 59.999-89.99.