Add Date: 2017/6/14 Views: 4277
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 the acid, alkali, salt medium is the ability to corrosion - that
is, corrosion resistance. But its corrosion resistance is the size of its steel
chemical composition, plus the 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 the ability to obtain
corrosion resistance. 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 many forms.
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 carefully choose a reputable manufacturers of products.
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