Stainless Steel Laundry Cabinet Manufacturer Tells You What Is

  • Many customers go to the market to buy stainless steel, and they bring a small magnet. When you look at the goods, you can suck it. It is good stainless steel. Without rust, it will not rust. In fact, this is a wrong understanding. The stainless steel belt is not determined by the structure of the magnetic structure. The molten steel forms "ferrite" during the solidification process due to the different solidification temperature. The following Stainless Steel Laundry Cabinet manufacturers come to share the difference between the belt and the magnetic?

    Stainless steel of different organizational structures such as "austenite" and "martensitic", in which "ferritic" and "martensitic" stainless steel are magnetic. The "austenitic" stainless steel has better comprehensive mechanical properties and processability weldability, but only the "ferritic" stainless steel with magnetic properties is stronger than "austenitic" stainless steel. The so-called 200 series and 300 series stainless steels with high manganese content and low nickel content in the market are not magnetic, but their performance is very different from that of high nickel containing 304. On the contrary, 304 is stretched, annealed, polished, cast, etc. The process will also be micro-magnetic, so it is unreasonable to judge the quality of stainless steel with stainless steel without magnetic. It is also unscientific.

    When brown rust spots (dot) appeared on the surface of stainless steel, people were amazed: "Stainless steel will not rust, rust is not stainless steel, it may be a problem with steel." In fact, this is a one-sided misconception about the lack of understanding of stainless steel. Stainless steel will also rust under certain conditions.

    Stainless steel has the ability to resist atmospheric oxidation, that is, rust, and also has the ability to resist corrosion in a medium containing acid, alkali, or salt, that is, corrosion resistance. However, the degree of corrosion resistance varies with the chemical composition of the steel itself, the state of each other, the conditions of use, and the type of environmental medium. For example, material 304 has absolutely excellent corrosion resistance in a dry and clean atmosphere, but it is moved to the coastal area and will soon rust in sea fog containing a large amount of salt. Therefore, not any kind of stainless steel can resist corrosion and rust at any time.

    Stainless steel is a very thin and strong and stable chromium-rich oxide film (protective film) formed on the surface to prevent oxygen atoms from continuing to infiltrate and continue to oxidize, thereby obtaining corrosion resistance. For some reason, the film is constantly destroyed, and the air or liquid neutralizes the oxygen atoms, and the iron atoms in the metal are continuously separated, forming loose iron oxide, and the metal surface is continuously Corrosion. There are many forms of such surface film damage, and the following are common in daily life:

    1. The surface of the stainless steel accumulates the deposits of dust or dissimilar metal particles containing other metal elements in the wet
      In the air, the condensed water between the attached material and the stainless steel connects the two into a micro-battery, which triggers an electrochemical reaction and the protective film is destroyed, which is called electrochemical corrosion.
    2. The surface of the stainless steel is adhered to organic juice (such as melon, noodle soup, etc.). In the case of water and oxygen, it constitutes an organic acid, and for a long time, it forms an organic acid to corrode the metal surface.
    3. The surface of the stainless steel adheres to acid, alkali, and salt substances (such as alkali water and lime water sprayed on the wall) to cause local corrosion.

    4, in the polluted air (the atmosphere containing a large amount of sulfides, oxides, hydrogen oxide), in the case of condensed water, the formation of sulfuric acid, nitric acid, acetic acid liquid point, causing chemical corrosion. All of the above can cause damage to the stainless steel surface protective film and cause corrosion. Therefore, in order to ensure that the metal surface is permanently bright and not rusted, we recommend:

    1 The decorative stainless steel surface must be cleaned and scrubbed frequently to remove deposits and eliminate external factors that cause corrosion.

    2 There is a kind of 201 and 202 stainless steel on the market which is easy to rust in the coastal area, suitable for use in the environment without industrial pollution and air corrosion.

    3 The waterfront area should be made of 304 stainless steel, which is resistant to seawater corrosion.