Let’s first talk about the classification of stainless steel commonly used in daily necessities: stainless steel is divided into: 201 stainless steel, 304 stainless steel, 304L stainless steel, 316 stainless steel, and 316L stainless steel. Among daily necessities, 201 and 304 stainless steel are mostly used; while 316L stainless steel is generally used for home improvement, residential and medical use. Under normal circumstances, stainless steel will not rust, but there is still a risk of corrosion under special circumstances. 201 stainless steel is the easiest to rust and the price is the cheapest; 316L stainless steel is the most expensive, quality and corrosion resistance It is also recognized as the best in the industry.
Stainless Steel refers to steel grades resistant to weak corrosive media such as air, steam, and water or stainless steel, also called stainless acid-resistant steel; steel grades resistant to corrosion by chemical corrosive media (acid, alkali, salt, etc.) It is acid-resistant steel. Their corrosion resistance is different because of their differences in chemical composition. Ordinary stainless steel is not resistant to corrosion by chemical media, while acid-resistant steel is non-corrosive. Stainless steel is rust-proof, which means the ability to resist atmospheric oxidation, but also has corrosion resistance, which means the ability to resist corrosion in media containing acids, alkalis, and salts. However, the size of its corrosion resistance varies with the chemical composition of the steel itself and the environment in which it is used. For example, stainless steel 304 has very good anti-corrosion ability in a dry and clean atmosphere, but when it is moved to seaside areas, the surface oxidation resistance is significantly weakened in sea fog containing a lot of salt; while 316 stainless steel But it is difficult to be corroded. Therefore, it is not any kind of stainless steel, which is corrosion-resistant and does not rust in any environment. The corrosion of stainless steel cups that are common in daily life are as follows:
1. An electrochemical reaction occurs between stainless steel and metal impurities on the surface, and the protective film is damaged, which is called electrochemical corrosion.
2. The residue in the food reacts to produce organic acid, which corrodes the surface.
3. The surface adhesion of stainless steel contains acid, alkali, and salt substances, causing local corrosion.
4. In the polluted air, it will form sulfuric acid, nitric acid, and acetic acid liquid spots when encountering condensed water, causing chemical corrosion.
The above conditions will cause damage to the protective film on the stainless steel surface. Therefore, we recommend the following methods to ensure that the metal surface is not corroded:
1. It is recommended that you frequently clean and scrub the decorative stainless steel surface to remove surface attachments and eliminate external factors that cause corrosion of stainless steel.
2. 316 stainless steel is easier to resist seawater corrosion. 316 stainless steel is recommended for coastal areas.
3. In order to avoid materials that are not up to standard, you need to find reliable and reputable manufacturers or merchants when purchasing stainless steel products. Don’t choose too cheap too much. The outrageous price is definitely not up to the standard.
4. In case of accidental rust, clean the rusty parts in time, keep the surface dry and clean, and wait for a period of time before the surface passivation layer is formed before use.
As long as the protective film on the stainless steel surface is not damaged, it can be used forever. It is best to change stainless steel tableware every three years. The main components of stainless steel are iron, chromium, and nickel alloys. In addition, it also contains trace elements such as manganese, titanium, cobalt, molybdenum and cadmium. This makes stainless steel stable, rust-proof and corrosion-resistant. sex. Good stainless steel products are corrosion-resistant, easy to clean, and not easy to damage. However, there are also disadvantages that the temperature resistance is not strong, and it is easy to burn if you do not pay attention.It should be noted that when buying stainless steel tableware, be careful not to buy unqualified tableware products.