Stainless steel products are sturdy and durable, which is a good helper in life, but its safety is related to people's health. In many news, many stainless steel products have exposed some hidden safety hazards, such as poor materials or improper use The phenomenon of rust, some stainless steel products used in tableware have exceeded the metal content, etc. For the safety of our friends, I will share some stainless steel maintenance tips.
1. Reasons for stainless steel products to rust:
(1). Steel type factor: It is the internal alloy composition of stainless steel. In fact, stainless steel is an alloy. However the size of the surface roughness. Determines whether it is easy to rust. Because the smaller the surface roughness is, the larger the surface roughness is. From a microscopic level, the area in contact with air is smaller, so it will not be easily oxidized.
(2), processing technology factors: stainless steel does not rust. It is because the combination of oxygen on its surface generates a passivation film (ie, an oxide film). The passivation film is formed during processing, such as a small extension of a flattener, and a small amount of grinding by a grinder. Both can cause the formation of an oxide film, of course, including the annealing of a bright annealing furnace under the protection of full hydrogen can form a good passivation film. Of course, there are many reasons for stainless steel rusting during processing and production of stainless steel, such as the excessive content of thionite in the grinding oil.
2, a good way to choose stainless steel products:
(1).Choose a reliable manufacturer
Among the stainless steel products on the market, some unscrupulous manufacturers use stainless steel products containing three harmful elements such as lead, cadmium and arsenic. The steel used in these stainless steels may be derived from recycled scrap materials. Those who choose to purchase must carefully select the producers, and the materials used are first-class authentic products from well-known steel mills.
(2).Select the right type of stainless steel
For example, austenitic stainless steel is suitable for containers that are in contact with food for a long time, while martensitic stainless steel is not suitable for holding food because it is not resistant to corrosion.
Stainless steel is not resistant to corrosion in all cases. In salt water, stainless steel may also be corroded, losing its shiny appearance and posing a safety hazard. Therefore, all stainless steel products must be cleaned with a detergent and wiped dry after use; to prevent corrosion, do not immerse stainless steel in an acidic solution for a long time.