"Understanding" what is the process of aluminium oxidation in surface treatment of medical devices?

Source:http://www.tenta-alu.com/news/4472.html  Release time:2019-02-20

Many people do not know exactly what process "aluminium oxidation" refers to. We will give you a brief introduction on this issue:

aluminium oxidation: aluminium or aluminium alloy products as anodes, placed in electrolyte solution for electrical treatment, using electrolysis to form aluminium oxide film on its surface, called aluminium and aluminium. Anodizing treatment of the alloy. After anodic oxidation treatment, several microns - hundreds of microns of oxide film can be formed on the surface of aluminium. Compared with the natural oxide film of aluminium alloy, its corrosion resistance, wear resistance and decorative properties have been significantly improved and improved. The principle of

aluminium anodic oxidation is essentially the principle of water electrolysis. When the current passes through, the following reactions will occur: on the cathode, H2: 2H++ 2e H2 is released on the anode, 4OH-4e 2H 2O + O 2. The oxygen released is not only molecular oxygen (O 2), but also atomic oxygen (O), and ionic oxygen (O-2), usually expressed as molecular oxygen in the reaction. Aluminum as an anode is oxidized by oxygen precipitated on it to form an anhydrous Al2O3 film: 2AI+3[O]=AI2O3+1675.7KJ. It should be pointed out that the generated oxygen does not react entirely with aluminium, and part of it is precipitated in the form of gaseous state. Anodic oxidation of

has been widely used in industry for a long time. There are many ways to classify the crown with different names. According to the current pattern,

can be classified as DC anodization, AC anodization, and pulse current anodization, which can shorten the production time to meet the required thickness. The film is thick, uniform and compact, and the corrosion resistance is significantly improved. According to the electrolyte, there are sulphuric acid, oxalic acid, chromic acid, mixed acid and natural colored anodic oxidation with organic sulphuric acid solution;

according to the nature of the film layer, there are ordinary film, hard film (thick film), ceramic film, bright modification layer, semiconductor barrier layer and other anodic oxidation;

DC sulphuric acid anodic oxidation method application It is common because it has the advantages of suitable anodic oxidation treatment for aluminium and most aluminium alloys; thicker film, harder and wear-resistant, and better corrosion resistance after sealing; colorless and transparent film, strong adsorption ability and easy coloring; lower treatment voltage and less power consumption;

treatment process does not need to change the voltage cycle, which is conducive to continuity. Production and practice operation automation; Sulfuric acid has less harm to people than chromic acid, wide supply, low price and so on. Over the past ten years, aluminium doors, windows and other decorative aluminium materials have been gradually used in China's construction industry. Their surface treatment production lines are all based on this method



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