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Reasons for rusty stainless steel
Jun 25, 2018

Why stainless steel is also rusty? When the surface of stainless steel pipe appears brown rust

 (point) when people were surprised: that "stainless steel is not rusty, rust is not stainless

 steel, steel may be a problem." In fact, this is a lack of understanding of stainless steel a 

one-sided error view. Stainless steel under certain conditions will be rusty. Stainless steel has 

the ability to resist atmospheric oxidation - that is, stainless steel, but also in acid, alkali,

 salt, corrosion resistance of the medium - that is, corrosion resistance. But its corrosion

 resistance is the size of its steel chemical composition itself, plus the state of each state,

 the use of conditions and environmental media type and change. Such as 304 steel pipe, in the 

dry and clean atmosphere, there is absolutely excellent resistance to corrosion, but it moved to

 the beach area, in a large amount of salt containing sea fog, will soon rust; and 316 steel

 performance good. Therefore, not any kind of stainless steel, in any environment can be resistant

 to corrosion, no rust.

    Stainless steel is the surface of the formation of a thin layer of thin and strong and 

stable stable chromium oxide film (protective film), to prevent the continued infiltration of

 oxygen atoms, continue to oxidize, and get the ability to resist corrosion. Once for some reason,

 the film has been constantly destroyed, the air or liquid oxygen atoms will continue to 

infiltrate or metal iron atoms continue to precipitate out to form loose iron oxide, metal

 surface will continue to rust. This surface film is damaged in the form of many, more common

 in daily life are the following:

    1, stainless steel surface containing other metal elements containing dust or heterogeneous

 metal particles of the attachment, in the humid air, between the attachment and stainless steel

 condensate, the two into a micro-battery, triggering the electrochemical reaction ,

 The protective film is damaged, called electrochemical corrosion.

    2, stainless steel surface adhesion of organic juice (such as vegetables, soup, sputum, etc.),


in the case of water and oxygen, constitute organic acids, long time the organic acid corrosion

 of metal surface.

    3, stainless steel surface adhesion contains acid, alkali, salt substances (such as decorative

 walls of alkaline water, lime water splash), causing local corrosion.

    4, in contaminated air (such as containing a lot of sulfide, carbon oxides, nitrogen oxide

 atmosphere), in case of condensate, the formation of sulfuric acid, nitric acid, acetic acid

liquid point, causing chemical corrosion.

    The above can cause damage to the surface of the stainless steel protective film caused by 

corrosion. So, to ensure that the metal surface is permanently bright and not corroded,

 we recommend:

    1, must always clean the surface of the decorative stainless steel scrub, remove the 

attachment, to eliminate the external factors caused by modification.

    2, the beach area to use 316 stainless steel, 316 material can resist seawater corrosion.

    3, the market some chemical composition of stainless steel pipe can not meet the corresponding

 national standards, up to 304 material requirements. So it will cause rust, which requires 

users to seriously choose a reputable manufacturers of products.

Add: No. 16, Road 3, Sanjiang Industry Zone, Shengzhou, Zhejiang, China

Contact:Boris Yue      

Email: boris@benoelectric.com

Contact:Charles Yu     

Email: charles@benoelectric.com

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