What are the causes of rusting in stainless steel tubes?

When the surface of the stainless steel tube brown rust spots, people are surprised: think "stainless steel tube will not rust, rust is not stainless steel tube, may be a problem with the quality of steel". In fact, this is a one-sided misconception of the lack of understanding of the stainless steel tube. Stainless steel tubes will rust under certain conditions.

Bewell® Stainless steel tube has the ability to resist atmospheric oxidation, i.e. stainless, but also has the ability to resist corrosion in media containing acids, alkalis and salts, i.e. corrosion resistance. But the size of its corrosion resistance is with its steel itself chemical composition, mutual state, use conditions and environmental media type and change. Such as 304 material, in a dry and clean atmosphere, there is absolutely excellent corrosion resistance, but it will be moved to the seaside area, in the sea spray containing a large amount of salt, will soon rust. Therefore, not any kind of stainless steel pipe, at all times can be resistant to corrosion, not rust.

   　Bewell® stainless steel tube are resistant to corrosion by relying on the formation of an extremely thin but strong and fine stable chromium-rich oxide film (protective film) on its surface, preventing oxygen atoms from continuing to penetrate and continue to oxidise. Once there is some reason for this film to be continuously damaged, the air or liquid and oxygen atoms will continue to infiltrate or the iron atoms in the metal will continue to precipitate out, forming loose iron oxide, and the metal surface will be subject to continuous rusting. This surface film is damaged in many forms, the most common in daily life are the following.

   1. stainless steel tube surface storage containing other metal elements of the dust or foreign metal particles attached, in the humid air, attached to the condensation between the stainless steel tube, the two will be connected into a microcell, triggering an electrochemical reaction, the protective film is damaged, known as electrochemical corrosion.

   2. Stainless steel tube surface adhesion of organic juice, in the case of water and oxygen, constitute organic acid, a long time is formed organic acid corrosion of the metal surface.

   3. Stainless steel pipe surface adhesion containing acid, alkali, salt substances (such as decorative walls of alkaline water, lime water spray test) caused by local corrosion.

   4. In the polluted air (containing a large number of sulfides, oxides, hydrogen oxide atmosphere), encountering condensation, the formation of sulfuric acid, nitric acid, acetic acid liquid point, causing chemical corrosion.

   　All of the above can cause damage to the surface protective film of stainless steel tubes, causing corrosion. Therefore, in order to ensure that the metal surface shiny, not be rusted, we recommend that：
   ① The surface of the decorative stainless steel tube must often be cleaned and scrubbed to remove adhesions and eliminate external factors that trigger rusting.
   ②There is a 201 and 202 material stainless steel pipe on the market in the seaside area is easy to rust, suitable for use in the absence of industrial pollution and air corrosion environment.
   ③Seafront areas to use 304 stainless steel pipe, 304 material can resist seawater corrosion.
As a professional stainless steel pipe manufacturer, Budweiser Steel Co., Ltd. Is willing to provide you with high quality stainless steel pipe. Welcome new and old customers to continue to cooperate with us and create a bright future together! And we will provide you with the best after-sales service and timely delivery.