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<p>When brown rust spots appear on the surface of stainless steel pipes, people will feel strange and think: "Stainless steel does not rust, and rust is not stainless steel. It may be that there is a problem with the steel." In fact, this is a one-sided wrong view of the lack of understanding of stainless steel. Stainless steel is not absolutely non-rusting, it is relatively non-rusting. Stainless steel can also rust under certain conditions.</p><p><br></p><p>Stainless steel has the ability to resist atmospheric oxidation---that is, non-rust, and it also has the ability to corrode in acid, alkali, and salt-containing media---that is, corrosion resistance. However, the size of its anti-corrosion ability varies with the chemical composition of the steel itself, the state of mutual addition, the use conditions and the type of environmental media. Such as 304 steel pipe, in a dry and clean atmosphere, it has absolutely excellent anti-corrosion ability, but if it is moved to a coastal area, it will quickly rust in the sea fog containing a lot of salt. Therefore, it is not any kind of stainless steel, which is corrosion-resistant and does not rust in any environment.</p><p><br></p><p>Stainless steel is an extremely thin, strong, dense and stable chromium-rich oxide film (protective film) formed on its surface to prevent oxygen atoms from continuing to penetrate and continue to oxidize, thereby obtaining the ability to resist corrosion. Once for some reason, the film is continuously destroyed, oxygen atoms in the air or liquid will continue to infiltrate or iron atoms in the metal will continue to separate out, forming loose iron oxide, and the metal surface will continue to be rusted. There are many forms of damage to this surface film, and the following are more common in daily life:</p><p><br></p><p>1. The surface of stainless steel has accumulated dust containing other metal elements or attachments of foreign metal particles. In moist air, the condensation between the attachment and stainless steel connects the two into a micro battery, which initiates an electrochemical reaction , The protective film is damaged, which is called electrochemical corrosion.</p><p>2. The surface of stainless steel adheres to the organic juice (such as melon, vegetable, noodle soup, sputum, etc.), which forms organic acid in the presence of water and oxygen, and the organic acid will corrode the metal surface for a long time.</p><p>3. The surface of stainless steel is adhered to contain acid, alkali, and salt substances (such as alkaline water and lime water splashing on the decoration wall), causing local corrosion.</p><p>4. In polluted air (such as the atmosphere containing a large amount of sulfide, carbon oxide, and nitrogen oxide), it will form sulfuric acid, nitric acid, and acetic acid liquid spots when encountering condensed water, causing chemical corrosion.</p><p>The above conditions can cause damage to the protective film on the stainless steel surface and cause rust.</p><p><br></p><p>When using <a href="https://www.zhtdoors.com/stainless-steel-rolling-door" rel="noopener noreferrer" target="_blank">stainless steel rolling door</a>, to ensure that the metal surface is permanently bright and not rusted, we recommend:</p><p>1. The decorative stainless steel surface must be cleaned and scrubbed frequently to remove attachments and eliminate external factors that cause rust.</p><p>2. Different installation sites should choose different materials of stainless steel. For example, 316 stainless steel should be used in coastal areas, which can resist seawater corrosion. 304 stainless steel is difficult to resist the invasion of sea salt.</p><p><br></p><p>How to remove rust after stainless steel rolling door rusts</p><p>1. If it is rusty in a small area, sand it with the finest sandpaper until it is bright.</p><p>2. If there is a large area of rust, there will be pickling, auxiliary wire brushing, and washing with clean water.</p><p><br></p>
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