摘要:
Method and solution to be used in the method for the electroless deposition of goid-alloy layers and patterns onto a substrate. The solution has a pH value between 11 and 14 and contains gold in the form of a complex compound, copper ions and a complex-forming compound for copper ions, formaldehyde and alkalimetal hydroxide for adjusting the pH, the complexing constant of the gold complex being at least 10 5 times that of the complexing constant of the copper complex.
摘要:
A lead immersion bath and method of superficially exchanging a tin layer for a lead layer, and a lead-tin alloy layer, respectively, which bath comprises an alkaline solution of a lead (II) compound and a complexing agent, in which the complexing agent has been chosen so that the complex constant of the lead complex in the solution used is smaller than the dissociation constant of hydroxyplumbite ions. The lead-tin alloy layer is obtained by a thermal treatment between 183°C and 232°C.
摘要:
Improvement of an electroless tin-plating method of articles of copper or of a copper alloy with a strongly alkaline solution which contains at least 0.20 mol/litre of bivalent tin ions and at least 1 mol/litre of alkalihydroxide at a temperature between 60 and 95 °C. The improvement consists of a pre-treatment with an acid solution of a bivalent tin salt and a complex former for Cu ++ and/or Sn ++ ions with which a layer of copper at the surface is exchanged for tin. The complex former preferably is thiourea.
摘要:
Manufacture of metal patterns on the surface of a substrate consisting of metal or a semiconductor compound while using a mask selected from Si0 2 or Si 3 N 4 which is first provided uniformly on the substrate from the vapour phase and is then etched away locally. The exposed parts are metallized by means of an electroless plating bath, if desired after a separate deposition of nuclei.
摘要翻译:在使用选自SiO 2或Si 3 N 4的掩模的同时,在由金属或半导体化合物构成的基板的表面上制造金属图案,其首先从气相在基板上均匀地提供,然后局部蚀刻掉。 暴露的部分通过化学镀浴进行金属化,如果需要,在分离沉积核之后。