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Magnesium anode, aluminum anode and other anode materials are widely used in cathodic protection. In order to make magnesium metal play a better role, the quality of the anode materials must be tested before they are used to detect whether the anode surface is contaminated. So when the anode surface is contaminated, what cleaning methods can be adopted?
1. Grinding and rough polishing
Grinding and rough polishing-is to use sandpaper belts, sandpaper wheels, rotary milling, etc. to clean it. Among them, sandpaper belts can be used to remove burrs and surface defects of die castings.
2. Dry sand shot blasting
Dry sand shot blasting-this method is one of the most commonly used methods for cleaning magnesium alloy castings. Generally, companies will choose silica sand, steel sand, glass balls or cut zinc shots, aluminum shots, etc. for sand blasting. This method can also be used for surface cleaning before pickling. When using sand or steel sand shot blasting, because steel sand embedded in the magnesium surface is prone to surface corrosion problems, dry sand shot blasting needs to be treated with acid before treating the magnesium anode surface.
3. Disc or Grinding
Disc or Grinding - This cleaning method is mainly used to clean the die-casting lubricating oil and other surface contaminants on the surface of magnesium alloy die-castings. It is usually used in combination with a detergent, and it has a certain polishing effect while cleaning the surface.
4. Wire Brush
Wire Brush - Wire brushes can clean the middle of magnesium alloy plates and remove oxides before arc welding or resistance welding. In order to ensure the cleaning effect of the wire brush, the pressure should be appropriate to improve the quality of the anode.
