In all applications of stainless steel, stainless steel screws are a very inconspicuous but closely linked way of
application. The stainless steel is a very excellent alloy metal.
There are three main types of metal
corrosion and usually can approach are composition design of contact surface of
metal and metal dielectric properties, its application environment and external
medium, change the stainless steel itself, if you want to use the complete
corrosion resistance of stainless steel to produce stainless steel screws,
unless special application requirements, or from the angle of economy it is not
cost-effective nor practical, and put the screws on the surface and easy to
cause the corrosion of the environment medium complete isolation, the
feasibility is very low.
Improve the composition structure of
stainless steel can increase the corresponding resistance in some situations,
but as the application of less ordinary stainless steel screws basically is not
taken in the optimization of steel components to meet the demands for use, and
even if the optimization cannot completely screw can meet the diverse and harsh
environment of demand.
Therefore, for stainless steel screws, the
most widely used and the most suitable corrosion resistance method is to make
surface treatment of the material.
Stainless steel screw surface corrosion
prevention technique refers to the use of various methods on the surface of
stainless steel materials with common protective layer, and its role is to
isolate the metal medium environment and corrosion resistance from the
formation to suppress the corrosion process, or reduce the corrosive medium and
the stainless steel material surface contact degree, so as to avoid or the
purpose of reducing corrosion.
The requirements for the protection layer of
the stainless steel screw surface are required as described below. The first is
to have good corrosion resistance, wear resistance and high hardness. Secondly,
the structure of the stainless steel material used is dense, perfect and small
pore. The third point is that both the surface protection layer and the matrix
metal should be separated and have good bonding force. The last point is that
the surface protection layer should be spread evenly and with a certain
The surface protection layer of stainless
steel usually includes two kinds of metal coating and non-metallic coating. The
metal coating means the metal or alloy with strong corrosion resistance is used
as the protective layer on the stainless steel surface, and the coating is also
called the coating. There are many ways to produce metal coating, the most
commonly used is electroplating, then molten metal plating and chemical surface
Instead of metal coating refers to the use
of organic polymer materials such as paint or inorganic material such as
ceramic, forming a protective layer on the surface of stainless steel material,
the protective layer can be stainless steel and the external environment medium
is completely isolated, also can effectively prevent the substrate from corrosion
of stainless steel.
Source: China Stainless Steel Screws
Manufacturer – Yaang Pipe Industry Co., Limited (www.yaang.com)