“I saw an article in the Evening News saying that the thermos cup could not be used to hold juice, otherwise the heavy metal in the cup would migrate out. After reading it, I was a little nervous. Many of my tableware were made of stainless steel, and I often contacted vinegar. Stainless steel containers do not work with juice. Is it more unsafe to encounter vinegar?" After reading the article "Insulation Cups of Juice is a little dangerous", Ms. Gong called the column and said that her family is jealous, now I don't dare to use stainless steel cutlery. Is this worry of Ms. Yan reasonable?
Disambiguation
Some juices are more corrosive than vinegar
In response to Ms. Qi’s question, the reporter contacted Xu Lei, a master tutor of the Metal Materials Teaching and Research Section of the School of Materials Science and Engineering, Qingdao University of Science and Technology.
“It is not advisable to store juice in stainless steel containers or glass containers.†Xu Lei explained, “This is because some juices are sour and have a pH of 1.2. Long-term exposure to stainless steel can be corrosive.†However, the pH of vinegar is relatively lower than that of such juice, and it is usually used in stainless steel chopsticks, spoons, and vinegar-containing dishes. It is so close to a few minutes. As long as it is of good quality stainless steel, there is no problem.
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304 stainless steel is the safest
What kind of stainless steel is the good quality stainless steel that Xu Lei said? "Stainless steel is also divided into many types. If you use austenitic stainless steel, which is usually called 304 stainless steel, it is food grade and has good anti-corrosion effect. However, Xu Lei also reminded that some stainless steel tableware does not necessarily use this type, and some use 200 series stainless steel, the corrosion resistance is worse. The corrosion product is the metal inside the stainless steel, such as chromium and manganese. If the amount is small, it is not too tight. "The trace elements of the human body also need some heavy metals."
Of course, we hope that the less bad substances we consume, the better the 304 material is when choosing stainless steel cutlery. Such tableware is usually purchased at large shopping malls and supermarkets, and can be distinguished by looking at the product identification when buying.
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Good stainless steel is not afraid of slight wear
People with stainless steel cutlery should have experience - this type of tableware takes a long time, and the surface of the wash brush will inevitably wear out. In the event of wear and tear, is it easy to precipitate harmful heavy metals when exposed to acidic substances?
“Food-grade stainless steel can be corrosion-resistant outside and inside.†Xu Lei told reporters that for 304 stainless steel, slight wear is not a problem and does not affect the use. As long as it is cleaned, it does not need to be replaced in a short time, unless there are many scratches on the surface, so it is easy to accumulate dirt, and it is not easy to wash off. This is not the same as the chopsticks of wood and bamboo. These chopsticks are best changed in half a year. Author: Zhang Yan
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