How to protect the stainless steel heating element?

- Nov 24, 2020-

How to protect the stainless steel heating element?

The corrosion resistance of stainless steel heating element is not certain, but relative and conditional. At this stage, there is no steel grade that does not corrode in any environment, both at home and abroad. Stainless steel electric heating element are also difficult to apply in any environment, so there is a high possibility of corrosion.

The long-term existence of rust spots not only affects the appearance, but also reduces the service life due to surface corrosion of stainless steel tubes. Rust spots on the surface of stainless steel element should be treated in time. Today we will talk about how to deal with the rust spots on the heating element?

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chemical method:

Use spray or pickling paste to assist the rusted parts to be re-passivated to form a chromium oxide film to restore the corrosion resistance. Apply the pickling paste to the surface to be treated, the thickness of the coating film is 0.5-2mm, usually the reaction time is 3-10 minutes or more, when it is used below 0℃ or where the oxide scale is thick, the time needs to be extended appropriately. It is best to use a brush to wash it several times during the treatment process. After the surface oxide scale is completely removed, rinse it with clean water (lime water or alkaline water is better) to avoid returning rust. After pickling, in order to remove all contaminants and acid residues, it is important to rinse properly with clean water. After all treatments, re-polishing with polishing equipment, and sealing with polishing wax. For those with slight rust spots, you can also use 1:1 gasoline and engine oil mixture to wipe off the rust spots with a clean cloth.

Mechanical method:

Sandblasting, using glass or ceramic particles to clean, submerge, brush and polish. It is possible to use mechanical methods to wipe off the pollution caused by the previously removed materials, polishing materials or annihilation materials. All kinds of pollution, especially foreign iron particles, are likely to become sources of corrosion, especially in humid environments.

Therefore, the mechanical cleaning surface should be cleaned in a dry condition as much as possible. The use of mechanical methods can only clean the surface, and cannot change the corrosion resistance of the material itself. Therefore, it is recommended to re-polishing with polishing equipment after mechanical cleaning and sealing with polishing wax.