Chemical Conductive oxidation

Conductive chemical oxidation forms a chromate film with a thin film, low contact resistance and certain electrical conductivity.

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Chemical conductive oxidation is divided into silver-white conductive oxidation and color conductive oxidation, the latter can be divided into khaki, rainbow and golden conductive oxidation.

1. The oxide film is colorless and transparent, with a thin film thickness of about 0.3 to 0.5 μm, with good electrical conductivity. It is mainly used for deformed aluminum electrical parts.

2. The film thickness is about 0.5μm, colorless to iridescent, dark brown, with good corrosion resistance and few pores. For larger parts or assemblies not suitable for anodizing.

3. The oxide film is golden yellow and iridescent, with good corrosion resistance, suitable for local oxidation of aluminum alloy welded parts.





4. The oxide film is iridescent and thin, and its conductivity is better than that of No. 2 formula, which is suitable for parts that require a certain conductivity.

5. After chemical conductive oxidation, the film needs to be post-treated and filled. The post-processing formula is: 30～50g/LK2Cr2O7 (or Na2Cr2O7) (CP grade); 90～95℃, 5～10min. It is usually used for the bottom layer of spray paint process or electrophoretic paint process.

6. Only by reducing the NaF content, the appearance of the film layer changes from iridescent to golden yellow. When the content of NaF was increased, the content of potassium ferricyanide was decreased, the oxidation time was shorter, and the appearance of the film was khaki, no longer iridescent.
 

The difference between anodizing and conductive oxidation:

1. Anodizing is carried out when the aluminum profile is energized in a chemical solution. It is an electrochemical reaction process; while conductive oxidation (also called chemical oxidation) does not require electricity, it only needs to be immersed in the potion. That's it, it's a pure chemical reaction.

2. The film produced by anodic oxidation has several microns to dozens of microns, and is hard and wear-resistant; the oxide film produced by conductive oxidation is only 0.01-0.15 microns, and the wear resistance is not very good. It can conduct electricity and is more resistant than the material. corrosion.

3. The anodizing of aluminum profiles takes a long time, and it takes dozens of minutes for a set of processes; the conductive oxidation is very fast, only ten seconds.

Therefore, the anodic oxidation or conductive oxidation of aluminum profiles should be selected according to the actual needs. In the occasions where conductivity is required, only conductive oxidation treatment can be used.

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Source: @cyanbat   Author: cyanbat

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