Flange Stainless Steel Electric Heating Tube Factory Direct - Yangzhou Darui

Flange Stainless Steel Electric Heating Tube Factory Direct - Yangzhou Darui

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How should the blackening problem of flange electric heating tubes be properly handled? Below, the aluminum casting heater manufacturer will introduce the relevant content to you:

1. Pre-cleaning preparation

First, clean the surface of the electric heating tube to remove impurities, thereby ensuring the surface of the heating tube is clean and tidy. 

2. Degreasing treatment

Immerse the electric heating tube in a degreasing solution with a pH value of about 13. The degreasing solution is easily available on the market. Immerse it in the alkaline degreasing solution for about 30 minutes. During this time, treat the surface of the heating tube. Use clean water to remove impurities generated by chemical reactions on the surface.

Ensure the surface is clean. 

3. Pickling

After degreasing treatment, the surface of the heating tube may have alkaline substances and other residues, so it is necessary to clean with an acidic liquid. Generally, the pH value of the acid solution is about 3. Immerse for about 10 minutes. After treatment, rinse the electric heating tube with clean water. 

4. Blackening treatment

Ensure the liquid pH value is between 2-4. The treatment time is about 10 minutes. After treatment, clean the surface of the heating tube. 

5. Drying and oiling

After the surface chemical treatment and cleaning of the heating tube,

it should be dried to remove surface water. After drying, apply oil to the electric heating tube. After blackening treatment, a layer of oxide film will form on the surface of the heating tube, which provides good corrosion resistance and protection for the heating tube.

Note: The above information and technical parameters are compiled and released by Yangzhou Darui Electric Co., Ltd.