High purity metal chromium, as an important industrial raw material, plays a crucial role in multiple fields due to its unique physical and chemical properties. This article introduces the characteristics, production methods, and main application areas of high-purity chromium metal.

Characteristics of high-purity chromium metal

Physical properties

Appearance and color: High purity metallic chromium appears silver white with a metallic luster. Pure chromium has ductility, but chromium containing impurities may become hard and brittle.

Density and melting point: Its density is about 7.20g/cm ³, and its melting point is as high as 1875 ℃. The melting temperature of high-purity chromium has slightly increased, reaching around 1850 ℃.

Stability: Chromium has high stability in air and its oxidation rate is slow even at high temperatures. Its surface is prone to forming an oxide film, which further slows down the oxidation rate.

Chemical properties

Corrosion resistance: Chromium has high corrosion resistance and can resist the erosion of various chemical substances. Insoluble in water and weak acids, but soluble in strong alkaline solutions.

Reactivity: Chromium can slowly dissolve in dilute sulfuric acid to form a blue solution. When reacting with concentrated sulfuric acid, sulfur dioxide and chromium (III) sulfate are generated.

Production method

The production of high-purity chromium metal mainly adopts electrolytic method and aluminum silicon thermal method. Among them, the electrolysis method is produced by electrolyzing chromic acid aqueous solution or chromium ammonium alum aqueous solution, with high product purity but relatively high energy consumption and cost. The aluminum silicon thermal method utilizes aluminum to reduce chromium oxide and obtain high-purity chromium metal, which is widely used in China.

Application Fields

Alloy manufacturing

High temperature alloys: High purity metal chromium is an important component of nickel based and cobalt based high-temperature alloys, which are widely used in high-temperature and high-pressure environments such as aviation, aerospace, and nuclear reactors.

Corrosion resistant alloys: Chromium's corrosion resistance makes it a key element in stainless steel and corrosion-resistant alloys, which have wide applications in fields such as chemical engineering and marine engineering.

Electronic industry

Sputtering target material: High purity chromium sheets are used as sputtering targets in industries such as semiconductors and optoelectronics for thin film deposition and the preparation of high-performance electronic devices.

Other fields

Research and experimentation: High purity chromium is also an important material in research and experimentation, used for preparing standard samples, analytical reagents, etc.

Aerospace: In the aerospace field, high-purity chromium is used to manufacture high-temperature and corrosion-resistant components, improving the safety and reliability of aircraft.

High purity metal chromium, with its unique physical and chemical properties, has shown broad application prospects in various fields such as alloy manufacturing, electronics industry, scientific research and experimentation, and aerospace. With the continuous development of technology, the demand for high-purity chromium metal will continue to grow, driving continuous innovation and expansion in its production technology and application fields.