Stainless steel is divided into "300" series and "400" series according to the grades, and is classified into "austenite", "ferrite" and "martensitic" according to the type. Due to its hard texture, martensitic stainless steel is the best choice for cutlery utensils. Relatively speaking, austenitic stainless steel with strong corrosion resistance is used in other stainless steel utensils. Some people may ask, why does stainless steel rust? Is rusty stainless steel safe? Stainless steel rust can be divided into two types: one is that after the sample is washed and dried, there are flaky white spots on the surface. This is more, accounting for about one-third of all samples; there is also a case where stainless steel is During the soaking process, black or red-black rust lines or rust spots appear on the surface, and there are a small amount or a large amount of dark precipitate in the soaking liquid, and sometimes the soaking liquid is also colored. In general, stainless steel with white spots, the heavy metal index is qualified, white spot formation may be due to the surface of the stainless steel protective film modified by acid, surface defects, pores or salt formation; dark rust is stainless steel An iron oxide formed by severe corrosion of iron. The above two kinds of stains are difficult to remove by ordinary consumers, that is, they are regenerated by using sandpaper. According to analysis, the rust of stainless steel is due to the iron contained therein, but as long as the surface has a protective film (oxide), the iron is not exposed to the air, and the stainless steel is generally not easily rusted. How to properly purchase and use safe and reliable stainless steel utensils? First, choose a reliable brand. During the laboratory test, a very small amount of stainless steel utensils were found to contain three serious toxic and harmful elements such as lead, cadmium and arsenic. The materials used in these stainless steels may be derived from recycled scrap. Therefore, we must strictly select a reliable brand, and we must not believe in the spread of goods, unlicensed goods. Second, choose the type of stainless steel. Austenitic stainless steels are suitable for use as containers for long-term contact with food, while martensitic types are not suitable because they are not resistant to corrosion. Here is a simple way to distinguish austenite and martensite - when consumers choose a pot, they can use a magnet to test the magnet of the pot. If some or all of the magnets are magnetic, the pot is not austenite. Stainless steel, it is best not to use. Although the martensitic stainless steel with magnetic properties is not resistant to corrosion, it has high hardness and is suitable for use as a knife and fork or a cutter head of a mixer or a pulverizer. In addition, the type can be judged by looking at the mark on the stainless steel product, such as the typical grade of austenitic stainless steel is 18-8 or 18-10. Third, stainless steel is not corrosion resistant in all cases. In salt water, stainless steel can also be corroded, losing its shiny appearance and posing a safety hazard. Therefore, all stainless steel utensils should be cleaned with detergent and dried after use; in order to prevent corrosion, stainless steel spoons and forks should not be soaked in the beverage for a long time. Do not use stainless steel containers for overnight storage (except dried fruits, etc.). In addition, if stainless steel utensils have rust or white spots, please discard them discreetly, because it is not feasible to manually remove the rust spots, and the rust spots will regenerate and deepen. (Wu Yiwei Lin Li) Smart Downlight,Wifi Smart Light Bulb,Led Smart Emergency Bulb,Smart Emergency Bulb JIANGMEN MOSCOT OPTOELECTRONIC TECHNOLOGY CO.,LTD. , https://www.jmsensorsled.com
Correct purchase and use of stainless steel utensils