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1. Principle. Because zinc does not change easily in dry air, and in humid air, the surface can form a very dense film of zinc carbonate, which can effectively protect the interior from corrosion. And when the coating is damaged for some reason and the matrix is not too large, the zinc and steel matrix form a micro cell, so that the fastener matrix becomes the cathode and is protected. It is widely used in automobile transportation and other industries, but what is needed is the trivalent chromium passivation layer, zinc nickel alloy plating closed coating, reduce the harmful and toxic layer of hexavalent chromium passivation.

Cotton is a staple fabric spun from the fibers of cotton plants. People around the world have been cultivating it for thousands of years. One of the earliest bits of cotton is at least 7,000 years old and was found in Mexico. In Egypt and Pakistan, people were weaving cotton thread into clothing in 3,000 BC. And in the 18th century, the British first found a way to spin cotton into textile with machinery.

'Bamboo has similar benefits to sateen,' says Bed, Bath & Beyond. 'It provides a silky smooth sensation and tends to be cooler to the touch than cotton. However, bamboo tends to be more expensive and requires more careful cleaning.'