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Advantages And Disadvantages Of Three Polishing Methods For Stainless Steel

Feb 02, 2021

Advantages and disadvantages of three polishing methods for stainless steel

Mechanical polishing

   Mechanical polishing is a mechanical term, which refers to polishing on a dedicated polishing machine, which relies on the relative grinding and rolling action between the extremely fine polishing powder and the grinding surface to eliminate wear marks. Its advantage is that the processed parts have good leveling and high brightness. The disadvantages are high labor intensity, serious pollution, inability to process complex parts, inconsistent gloss, short gloss retention time, dullness and rust. More suitable for processing simple pieces, medium and small commodities.  

Chemical polishing

  Chemical polishing is a method that relies on the chemical etching of chemical reagents to selectively dissolve uneven areas on the surface of the sample to eliminate wear marks and etch to level it.


Advantage

The advantage of chemical polishing is that the chemical polishing equipment is simple and does not require any special equipment. It only needs a glass cup containing the polishing liquid and a clamp for holding the sample. If the sample is cut with a thin abrasive sheet, it can be directly polished without sandpaper polishing after cutting. Some non-conductor materials can also be chemically polished, and non-conductor mosaic samples can also be polished directly. Chemical polishing can also handle parts with more complex shapes.


Disadvantage

1. The quality of chemical polishing is not as good as electrolytic polishing.

2. It is difficult to adjust and regenerate the solution used in chemical polishing, and it is limited in application.

3. During the chemical polishing operation, nitric acid emits a large amount of yellow-brown harmful gas, which causes serious environmental pollution.

4. The service life of the polishing solution is short, and the adjustment and regeneration of the solution concentration are difficult.


Electrochemical polishing

Electrochemical polishing is also called electrolytic polishing. Electrolytic polishing uses the polished workpiece as the anode and the insoluble metal as the cathode. Both electrodes are immersed in the electrolytic tank at the same time. Direct current is applied to produce selective anode dissolution, thereby achieving the effect of increasing the surface brightness of the workpiece. Suitable for mass production, it is mainly used for high-end goods, export goods, and public service goods. Its processing technology is stable and the operation is simple.


Advantages of electrolytic polishing

⑴The inner and outer colors are consistent, the luster is long-lasting, and the recesses that cannot be thrown by mechanical polishing can also be leveled.

⑵ High production efficiency and low cost.

⑶Increase the corrosion resistance of the workpiece surface

Disadvantages of electropolishing

High pollution prevention, large one-time investment in processing equipment, tooling and auxiliary electrodes for messy parts, and cooling equipment for mass production.