SU704978A1 - Method of treating silver platings - Google Patents

Description

. ,, . ... ;.

The invention relates to the production of printed circuit boards. . .

There is a method of processing sulfur-. printed coatings, which include etching in iron chloroforin solution, washing with water, clarification of iron-ferrous potassium based solution, repeated washing with water, and brushing 1.

A disadvantage of the known method of treating a silver coating is the laboriousness of the operation of the Kratsovskaya NIN operation, the unevenness of the tolvdina coating, deep scratches on the surface, and a short shelf life (over one and a half months).

The purpose of the invention is to increase the quality and increase the shelf life of the silver coating. This is achieved by the fact that, in the method of treating a web of coated coatings of printed circuit boards, which includes etching in iron solution, washing with water, bleaching in a solution based on potassium syngene, re-washing with water and brushing, bleaching the coating is carried out in a solution containing potassium ferrosynerodynamic , potassium rhodanum iodine, distilled within 0.5-0.6 min after repeated rinsing, the silver coating is treated in a solution containing potassium rhodium and water distilled for 0.5-1.0 min at eratura solution 18-25 C,

0, followed by washing with water for 2-3 minutes and drying, the clarification solution containing the starting components in the following amount, wt%:

five

Potassium ferro-synergistic 21-23 Potassium rhodium 8-10 Distilled water. Rest. In addition, the solution for treating silver coatings contains the initial components in the following amount, wt.%:

Potassium Rodanist 9-11 Distilled water Else. The table shows the processing mode

5 silver coatings at a temperature of 18-25 ° C.

Clarification in the solution:

Potassium zheleosinerodistyy Potassium rhodanisty Distilled water

0.5 - 0.6

21 8 Else

Rinsing with water. Treatment with a solution. Potassium tribe. Distilled water. Washing with a Veda. Drying; ,

Clarification In solution Cadium ferrosynergide Potassium of the genus. Sulphurous water Distilled Rinsing with water Curing with a solution:. Kapiy Rodanisty. Distilled water Rinsing with water Drying.

Clarification in solution: Potassium zineosynuronists Potassium rhodium Water distilled Rinsing with water Solution treatment: Potassium rhodium Water distilled Rinsing Drying After processing by daylight, the printed circuit boards are stored without packaging (not packed in sealed polyethylene bags with silica gel placed in them). workshops. The introduction of the treatment of silver coatings of printed circuit boards in a solution containing potassium rhodium and distilled 0, 2

0.1

0.5 1.0

Rest

2 - 3

0.5 - 0.6

9 Else

0.1

0.2

0.5 1.0

10 Else

2 - 3

0.5 - 0.6

23 10 Else

0.1

0.2 0.5 1.0

Rest

2 - 3 baths of the iBMecTo type of dyeing, as well as clarification of the coating in a solution containing potassium ferrocyanide potassium and distilled water, makes it possible to improve the quality of the silver coating by eliminating defects resulting from the brushing operation.

extend the shelf life of silver coatings on printed circuit boards by up to three months (when stored unpacked).

Formula of Invention

Claims (3)

1.SPOSO6 treatment of silver coatings predominantly of printed circuit boards, including etching with water, clarification in a potassium-based solution of ferrosynergide, repeated pro-watering with water and brushing is distinctive, and with the aim of improving the quality and extending the shelf life of the coating a solution containing potassium ferrosynergide, potassium rhodium and water distilled for 0 / 5–0.6 min; after repeated washing, the silver coating is treated in a solution containing potassium rhodium and water, distilled 18 within 0.5-1, O min, at temperature the solution 18-25c is subsequently washed with water for 23 minutes and dried. 2. A method according to claim 1, characterized in that the clarification solution contains the initial components in the following amount, wt.%: Potassium ferro-sintered 21-23 Potassium 8-10 10 Distilled water The rest,: 3. The method according to claim 1, characterized in that the solution for treating silver coatings contains the starting components in the following amount, wt.%: Potassium Rodanist 9-11 5 Distilled water Else. Sources of information taken into account in the examination 1. Industry standard. Printed circuit boards. Typical technological OST 0 IGO 054.058. Red Shares 1-72 sec. 45 prototype).