Titanium is best used as a hanger because titanium is more resistant to corrosion and has a long life. Titanium ions have no effect on the bath. It is recommended not to use copper hangers because copper ions will deposit a layer of copper on the stainless steel surface that will not affect the polishing quality. The bare part of the copper can be baked into a film with a polyvinyl chloride glue, and the insulating film is scraped off at the contact point.
1. Definition:
The electropolishing is to use the workpiece to be thrown as the anode and the insoluble metal as the cathode. The two poles are simultaneously immersed in the electrolytic cell, and the selective anode is dissolved by the direct current to achieve the effect of increasing the brightness of the surface of the workpiece.
2. Principle:
The principle of electropolishing is now a lot of debates among people from all walks of life in the world. It is generally recognized as the theory of mucosa. The theory is mainly: the metal ion detached from the workpiece and the phosphoric acid in the polishing solution form a phosphate film adsorbed on the surface of the workpiece. The mucosa is thinner at the convex portion, the concave portion is thicker, and the current density is high due to the convex portion. The dissolution is fast, as the mucous membrane flows, the irregularities change, and the rough surface is gradually leveled.
3. Electropolishing advantages:
(1) The color inside and outside is consistent, the gloss is long-lasting, and the recess that can not be thrown by mechanical polishing can be leveled.
(2) High production efficiency and low cost.
(3) Increase the corrosion resistance of the workpiece surface.
4. Electrochemical polishing requirements and equipment
(1) Power supply:
The power supply can be selected from two-phase 220V and three-phase 380V.
(2) Rectifier
Electrolytic polishing is not too strict on the power supply waveform. A high-frequency rectifier can be selected for the thyristor rectifier.
Rectifier no-load voltage: 0-20v
Load voltage (operating voltage): 8-10v
The working voltage is lower than 6v, the polishing speed is slow, and the brightness is insufficient.
Rectifier current: Depending on the size of the customer's workpiece.
(3) Electrolytic tank and supporting facilities (anode rod)
It can be welded by hard PVC sheet. Install three electrode rods on the groove, with a movable anode rod in the middle, connect the anode of the power supply (or the positive pole), and the cathode rods on both sides, connect the cathode of the power supply (negative pole).
(4) Heating facilities and cooling equipment
1 heating can use quartz heating tube, titanium heating tube.
2 Cooling optional coil, the coil can be heated to cool.
(5) Fixture
Titanium is best used as a hanger because titanium is more resistant to corrosion and has a long life. Titanium ions have no effect on the bath. It is recommended not to use copper hangers, because copper ions will deposit a layer of copper with poor adhesion on the surface of stainless steel "target=_blank> stainless steel, which will affect the polishing quality. The exposed parts of copper can be baked with PVC glue. , scrape off the insulating film at the contact point.
(6) anode and cathode materials
The anode and cathode rods are coated with copper rods or copper tubes. The length of the copper tubes is 20 cm for the length of the electrolytic cell. The lead plates are applied to the cathode plates. The lead plates are fixed on the cathode rods. The length of the lead plates is 10 cm and the width of the lead plates is according to the grooves. Long, usually 10 cm, 20 cm size.
For the moment, electropolishing is mainly for the surface brightening of stainless steel "target=_blank> stainless steel workpieces. Stainless steel" target=_blank> stainless steel workpieces are divided into 200 series, 300 series, 400 series materials, each series of materials must be used Electrolytic polishing liquid. For example, stainless steel "target=_blank> stainless steel 200 series stainless steel" target=_blank> stainless steel, must use 200 series of formula, this formula can not adapt to 300 series or 400 series of stainless steel "target=_blank> stainless steel material. This has been A major problem in China, because some manufacturers' materials are combined workpieces, including 200 series stainless steel "target=_blank> stainless steel, and 300 or 400 series stainless steel" target=_blank> stainless steel. In December 2007, Weihai Yun Senior engineer Wang Lingshu of Qing Chemical Development Institute developed a stainless steel "target=_blank> stainless steel universal electrolyte. This electrolyte is suitable for all stainless steel "target=_blank> stainless steel. It combines all the advantages of the original electrolyte, the specific gravity of the electrolyte is 1.70, the brightness is the mirror brightness. At the same time, new advantages are also developed. This electrolyte increases the original brightness and reduces the current density by half. In the production operation, it can save 50% of the electricity cost. The service life is increased by 40%. This electrolyte has been leading technology in China.
Http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn
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