What is tinplate? Analysis of the white iron noun
Tinplate is a tin plate coated with tin on the surface. It is not easy to rust, also called tinplate. The tinplate was first produced in Bohemia (now in the Czech Republic and Slovakia). The area has been rich in metal since ancient times, with advanced technology and knows how to use hydraulics to manufacture machinery. Since the 14th century, it has been producing tinplate. For a long time, it has been the main producer of tinplate in the world. At that time, tinplate was mainly used to make tableware and drinking utensils.
In the 17th century, Britain, France and Sweden all hoped to establish their own tinplate industry, but due to the need for large sums of money, they have not been developed. It was not until 1811 that Brian’s production of tinplate was developed on a large scale. Today, the world produces about 250,000 tons of tin per year, more than one-third of which is used to make tinplate, most of which is used in the canned food industry.
White iron is a common name for galvanized iron. Prepare by immersing a clean piece of iron in molten liquid zinc. Although zinc is more active, it can form a layer of basic zinc carbonate in humid air containing CO2:
4Zn 2O2 3H2O CO2→ZnCO3?Zn(OH)2
This layer of basic zinc carbonate film is relatively tight and can be used as a protective film to prevent internal zinc from being continuously oxidized. If galvanic corrosion occurs after the galvanized layer is destroyed, since zinc is more active than iron, zinc will be lost as an oxidation reaction of the negative electrode of the primary battery, and the iron is protected. [In contrast to tinplate (tin-iron), when galvanic corrosion occurs in tinplate, iron is protected inside because iron is more active than tin. But if the tin layer is broken, since tin is the positive electrode of the primary battery, tin will make the iron corrode faster.)
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