The main reasons for the liner of the thermos cup to rust include material problems, improper use, natural aging and technical problems.
Material problem: If the liner of the thermos cup does not meet food-grade stainless steel standards, or it is not made of real 304 or 316 stainless steel, but lower-quality 201 stainless steel, such materials are more likely to rust. Especially when the liner of the stainless steel thermos cup is rusty, it can be directly judged that the material of the cup is not up to standard, possibly because of the use of fake stainless steel.
Improper use:
Salt water or acidic liquids: If the thermos cup stores salt water or acidic substances, such as carbonated drinks, for a long time, these liquids may corrode the stainless steel surface and cause rust. Therefore, it is not recommended to use high-concentration salt water to sterilize new thermos cups, as this will cause corrosion of the stainless steel surface, resulting in rust spots.
Environmental factors: If the thermos cup is stored in a hot and humid environment for a long time, the oxidation and rusting process of stainless steel will also be accelerated. Although good quality stainless steel water bottles will not rust easily, incorrect use and maintenance methods can lead to rust.
Natural aging: As time goes by, the thermos cup will undergo natural aging, especially when the protective layer on the outer surface of the cup body is worn away, rust will easily occur. If the thermos cup has been used for more than five years and the protective layer on the outer surface of the cup body has been worn away, rust is more likely to occur.
Technical problem: During the production process of the thermos cup, if the weld is too large, it will destroy the protective film structure on the stainless steel surface around the weld. In addition, if the painting technology is not up to standard, the paint will easily fall off at this location and the cup body will rust. . In addition, if the interlayer of the thermos cup is filled with sand or other workmanship defects, it will also lead to poor insulation effect and even rust.
To sum up, there are various reasons for the liner of the thermos cup to rust, including material, usage method, environmental factors, production technology and other aspects. Therefore, choosing a high-quality stainless steel thermos cup, correct use and maintenance, and paying attention to the storage environment are the keys to preventing the inner tank of the thermos cup from rusting.
Post time: Jul-12-2024