When the surface of the stainless steel sink appears brown rust spots (dots), people are surprised: think "stainless steel sink is not rust, rust is not stainless steel sink, may be a problem with the steel". In fact, this is a one-sided misconception of the lack of understanding of stainless steel sinks. Stainless steel sink will also rust under certain conditions.
Stainless steel sink has the ability to resist atmospheric oxidation - that is, stainless, but also in the medium containing acid, alkali, salt is the ability to corrode - that is, corrosion resistance. But the size of its corrosion resistance is with its steel itself chemical composition, plus mutual state, use conditions and environmental media type and change. Such as 304 steel plate, in a dry and clean atmosphere, there is absolutely excellent corrosion resistance, but it will be moved to the seaside area, in the sea spray containing a large amount of salt, will soon rust; and 316 steel pipe is good performance. Therefore, not any kind of stainless steel sink, in any environment can be corrosion-resistant, rust-free.
Stainless steel sink is a layer of extremely thin and strong and fine stable chromium-rich oxide film (protective film) formed on its surface to prevent the continued penetration of oxygen atoms, continued oxidation, and the ability to obtain corrosion resistance. Once there is some reason, this film is constantly destroyed, the oxygen atoms in the air or liquid will continue to infiltrate or metal iron atoms constantly precipitated out, the formation of loose iron oxide, the metal surface is also subject to constant rusting. This surface film is damaged in many forms, the following are common in daily life.
1. Stainless steel sink surface containing other metal elements of the dust or foreign metal particles accumulated on the attachment, in the humid air, the attachment and stainless steel sink between the condensation, the two will be connected into a microcell, triggering an electrochemical reaction, the protective film is damaged, called electrochemical corrosion.
2. Stainless steel sink surface adhesion of organic juices (such as vegetables, noodle soup, spit, etc.), in the case of water oxygen, organic acids, organic acid corrosion of the metal surface for a long time.
3. Stainless steel sink surface adhesion containing acids, alkalis, salts (such as decoration of the wall of alkaline water, lime water splash), causing local corrosion.
4. In the polluted air (such as containing a large number of sulfides, carbon dioxide, nitrogen oxide atmosphere), condensation, the formation of sulfuric acid, nitric acid, acetic acid liquid point, causing chemical corrosion.
All of the above can cause damage to the surface of the stainless steel sink protective film caused by rust. Therefore, to ensure that the metal surface is permanently bright and not rusted, we recommend that
1. the surface of decorative stainless steel sink must be frequently cleaned and scrubbed to remove adhesions and eliminate external factors that trigger retouching.
2. Seaside areas to use 316 stainless steel sink, 316 material can resist seawater corrosion. 3. Some stainless steel sink tube chemical composition on the market can not meet the corresponding national standards, not up to 304 material requirements. Therefore, it will also cause rust, which requires users to carefully select the products of reputable manufacturers.