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[Tinplate surface hardness test]
We know that the strength of the surface strength of a tinplate can be related to the thickness of the material and the hardness of the material used in the can. One factor alone is that it cannot judge the bearing capacity of the tank surface.
Tinplate is a tin plate coated with tin on the surface. It is not easy to rust, also called tinplate. It is prepared by dipping iron pieces into molten liquid tin. Tin is an inactive metal that is neither oxidized by air nor reacted with water, so it has a strong resistance to corrosion. A thin layer of tin is plated on the iron to provide good protection. However, when the coating is electrochemically corroded after being destroyed, since iron is more active than tin, iron will be lost as an oxidation reaction of the negative electrode of the primary battery, and the presence of tin will accelerate the corrosion rate of iron, so tinplate is different from white iron, and it can only The effect of protecting iron is only obtained when the plating is intact.
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 water to make 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. However, due to the need for large sums of money, they have not been developed. It was not until 1811, when Brian Donkin and John Hall opened tinplate canned food, the tinplate manufacturing 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.
2, the hardness test of tinplate
In the past, the hardness test of tinplate was mostly based on a desktop surface Rockwell hardness tester, and the ordinary steel flat anvil was used to test the hardness of HR30T.
In recent years, since the national standard GB/T2520-2000 for tinplate has adopted the internationally accepted HR30Tm hardness representation method, the HR30Tm hardness value of diamond anvil and test tinplate has been adopted in China.