What is the reason why the electric telescopic door rusts?

For stainless steel products, such as electric telescopic doors and other processed products, most people think that it will not rust. This is a relatively one-sided view. In addition to its own defects, the corrosion of stainless steel is greatly related to the environment, such as the humidity of the air, the temperature of the air, the movement speed, the movement direction, the composition and quantity of impurities contained in the air.


1. There is dust containing other metal elements or attachments of dissimilar metal particles on the surface of stainless steel. In wet air, the condensate between the attachment and the stainless steel connects the two into a micro-battery, triggering an electrochemical reaction and damaging the protective film, which is called electrochemical corrosion


2. The surface of stainless steel is adhered with organic juice (such as rice juice, saliva, etc.), which forms organic acid under the condition of water and oxygen, and forms the corrosion of organic acid on metal surface for a long time.


3. In the polluted air (atmosphere containing a large amount of sulfide, oxide and hydrogen oxide), the condensation water will form nitric acid and acetic acid liquid points, causing chemical corrosion.



4. The surface of stainless steel adhered with acid, alkali and salt substances (such as alkaline water and lime water spray test for decorative walls) caused partial corrosion.

In conclusion, the protective film on the surface of stainless steel will be damaged and cause corrosion. Therefore, in order to ensure that the metal surface is permanently bright and not rusted, we advocate:


① Regularly check the condition of the electric door exterior watch, regularly clean and scrub, remove the attachments, and eliminate the external factors that cause corrosion.



② For those areas without industrial pollution, it is necessary to inform relevant personnel when installing stainless steel products, and select appropriate types of stainless steel materials, such as 201 and 202 raw materials.

③ The coastal area should use 304 raw material stainless steel, which can resist seawater corrosion.