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Last 10 Posts (In reverse order)
zhangxiaosan Posted: Thursday, March 14, 2019 10:53:24 PM(UTC)
 
Nickel, a hard ductile ferromagnetic metallic element similar to silver, is highly polished and corrosion resistant. Nickel belongs to ferrophilic elements. Nickel is the highest in the earth's core and is a natural ferronickel alloy. In the crust, the nickel content of mafic rocks is higher than that of silica-alumina rocks. For example, peridotite contains 1000 times more nickel than granite and gabbro 80 times more nickel than granite.
On October 27, 2017, the World Health Organization International Agency for Research on Cancer published a list of carcinogens for preliminary reference. Nickel compounds are listed in a class of carcinogens.
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Cobalt, nickel and alloy powders containing 66-67% nickel, 13-16% chromium and 7% iron were implanted into the list of 2B carcinogens.
Meteorites contain iron and nickel, which were used as good iron in the early days. Because the metal does not rust, it is considered silver by the indigenous people of Peru. An alloy containing zinc and nickel, called white copper, was used in China in 200 BC. Some even extend to Europe.304 stainless steel plate 3mm thickness
In 1751, Alex Fredrik Cronstedt, who works in Stockholm (the capital of Sweden), studied a new metal, nickel arsenate (NiAs), from Los in Helsinland, Sweden. He thought it contained copper, but he extracted a new metal, nickel (nickel), which he announced and named in 1754. Many chemists believe that it is an alloy of cobalt, arsenic, iron and copper - these elements occur in trace amounts of pollutants. It was not until 1775 that pure nickel was produced by Torbern Bergman, which confirmed that it was an element.
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