Precision polishing technique for stainless steel printed circuit board

Abstract

the invention discloses a precise polishing technology of stainless steel printing circuit, which comprises the following steps: electrolyzing to remove oil; cleaning working piece; removing burr through electrolyzing; polishing; inactivating; cleaning; drying. the electrolyte at electrolyzing disposal contains 1.62-1.65% sulfuric acid, 0.56-0.60% phosphoric acid and 97.76-97.80% water. the electrolyte at electrolyzing precise polishing contains 24-28% sulfuric acid, 47-51% phosphoric acid, 0.02-0.04% ammonia sulfate, 0.01-0.03% ammonium phosphate, 0.03-0.04% cellulose, 0.005-0.007% saccharin and 21.1-28.9% water.

Description

Technical field: [0001] The invention relates to a polishing process of a stainless steel printed circuit board after laser cutting, in particular to an electrolysis deburring treatment and precision polishing process of a stainless steel printed circuit board. technical background: [0002] Electrochemical polishing technology has been widely used in the polishing treatment of stainless steel moulds, catering utensils, large stainless steel pieces, plates and pipes in recent years. Looking at the application of electropolishing technology at home and abroad, especially the steel plate with large area and thin thickness (below 0.1mm ) There is no precedent for electropolishing treatment of precision parts. The reason is that on the one hand, the current density of electropolishing treatment requiring high brightness is too high, resulting in large dimensional changes, which is not suitable for stainless steel precision products that require strict dimensional changes. On the ...

AI Technical Summary

Problems solved by technology

The high current density causes energy waste, and at the same time, it is easy to cause severe hydrogen evolution at the cathode, and the electrolysis speed of the anode is too fast. The surface is prone to streak shadows and affects the surface quality.

[0005] Lanzhou Xingye Material Protection Co., Ltd. adopts a dynamic continuous polishing method for large-area engineering electrochemical polishing of stainless steel container equipment. The solution contains chromic anhydride, and a large amount of heat is released during electrolysis. Cooling equipment must be added, which consumes energy and increases cost, and the polishing time is long, the amount of corrosion is large, and the overlapping of the polishing surface causes the overall polishing surface to be uneven

And the current density also reaches 60~120A / dm 2 , resulting in a waste of energy

[0006] Although the electrolytic polishing solution developed by Kaifeng Electroplating Factory does not contain chromic anhydride, self-developed additives are added to the sulfuric acid and phosphoric acid systems, and the current density is reduced to 15A / dm 2 or so, but the process operating temperature is above 100°C, the operation is inconvenient, and it is limited to austenitic stainless steel, which has certain limitations

[0007] Xi'an University of Electronic Science and Technology and other units have adopted the method of adding additives to sulfuric acid and phosphoric acid alone in the electropolishing process of stainless steel 1Cr18Ni19Ti. Although it overcomes the shortcomings of using chromic anhydride, the corrosion amount exceeds 1mm when it is bright.