Accessories On Fire Products Surface Yellow Oxidation Aluminum Parts

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Aluminium or Aluminum Alloy Parts Surface Treatment:

1. Mechanical polishing;

2. Chemical treatment removes copper from certain alloy surfaces;

3. Cleaning de-oiling (for parts that have been anodeized, if you want to re-anode, remove the original anode surface with alkali or special agents);

4. Put the thin sulphuric acid into the anode for powering up and generating a surface oxidation layer (porous, with no color);

5. Staining;

6. Fix (heating or using chromates. close the holes in the surface oxidation layer).

The anode effect is a unique phenomenon of molten salt electrolytic, and the performance of electrolytic aluminum production is obvious. When the anode effect occurs in production, the electrolyte voltage rises sharply to 20 to 50V, sometimes even higher. Its occurrence has a great impact on the entire electrolytic series, reducing current efficiency, affecting the electrolytic technical indicators, and reducing the output and quality of aluminum, destroying the smooth power supply of the entire electrolytic series. In the treatment method, there are no more than two kinds: with the effect rod (wood rod) extinguished, or reduce the anode, increase the amount of alumina. To achieve the purpose of extinguishing the anode effect. To this day, no better treatment has been found.

In today's society, especially in Western countries, the control of anode effect in aluminum electrolytic production is very strict. It has now shifted from fluoride over several years to the amount of anode effect (USEPA) of the greenhouse gas PFCs-CF4-C2F6. Haupin, a well-known international aluminum expert, put forward the management idea of "targeting zero effect", which is worth thinking about, Haupin believes that according to the current situation of aluminum industry development, "zero effect" management is the most ideal. To this end, the author believes that: in the increasingly important environmental protection today, aluminum electrolytic production, especially in the production of large-scale pre-baking tank should strictly control the anode effect, as long as the electrolytic tank condition is normal, there is no need to effect. "Zero effect" management is the future development direction of aluminum electrolytic production.

How the anode effect occurs:

Up to now, there are many different opinions about the occurrence of anode effect, but what better explains the occurrence of anode effect is the the theorization of anode process change.1: The anode effect occurs because the oxygenated ions in the electrolyte gradually decrease with the electrolytic process. When a certain degree is reached, fluoride is produced and the anode carbon action produces carbon fluoride, carbon fluoride in the decomposition of the fine carbon particles, these carbon particles attached to the anode surface, to prevent the contact between the electrolyte and the anode, So that the electrolyte can not moisten the anode well, just as water can not moisten the surface of the oil, so that the electrolyte-anode between the formation of a layer of poor conductivity of the air film, the anode overvoltry increased, causing anode effect. When a new alumina is added, oxygen, oxygen and carbon powder reaction are analyzed on the anode, which gradually makes the anode surface quiet, the resistance decreases, and the electrolysis process tends to be normal.

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