Why Do Some Stainless Steel Filter Elements Turn Black?
Sep. 06, 2021
The stainless steel filter element occasionally turns black during use. What is the cause? This is still related to the constituent elements of the original material. As a Stainless Steel Wire Mesh supplier, let us analyze the blackening phenomenon of the stainless steel filter element together.
The main elements of the stainless steel filter element are iron, nickel, and chromium, which are alloy products of these three metals. The three metals can be produced in different proportions. The stainless steel products obtained also have different properties and different appearances. When the iron content is constant, the higher the chromium content, the brighter the stainless steel wire, and the higher the nickel content, the darker. If the content of chromium and nickel remains the same, the paste will become darker if the content of the paste increases. This is the judgment of the initial appearance of the product.
If the stainless steel filter element becomes black in use, it is caused by oxidation, and the iron element contained in it will quickly become black when heated and oxidized, and it does not show signs of rust.
In the production process of the stainless steel filter element, the lubrication of the wire drawing machine is not good enough, the friction resistance is too large, and the surface heating of the stainless steel wire mesh causes the segregation of gold elements in the steel wire. The alloy composition is analyzed, and the surface becomes black.
There is no single reason for the blackening of the stainless steel filter element. In order to solve this problem, it needs to be solved from many aspects.
Stainless steel filter element refers to all metal filter elements welded by argon arc welding. There are two main filter materials for the production of stainless steel filter elements: stainless steel woven mesh and stainless steel fiber sintered felt. The stainless steel woven mesh is made of stainless steel wire. The foldable filter element has the characteristics of smoothness, easy cleaning, high temperature resistance, corrosion resistance, non-shedding of the wire mesh, and long filtration cycle. Stainless steel fiber sintered felt is a kind of deep hole filter material made by high temperature sintering of stainless steel fiber. The pleated wave treatment filter element has the characteristics of high porosity, good air permeability, strong dirt absorption ability, and strong regeneration ability.
Compared with ordinary bonded pleated filter elements, the welding process of the melt filter element determines that the structural strength of the filter element itself is relatively large, and it will not collapse and leak even under high pressure conditions. Generally speaking, it is filtration. Contamination of the medium. The melt filter element has the characteristics of high temperature resistance, high pressure resistance, chemical corrosion resistance, and good permeability. With high gas content and high strength, good sealing, long service life, repeatable cleaning and other advantages.
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