[1] Differences in physical and chemical properties
Although chromium (Cr) and nickel (Ni) are both transition metal elements, they are similar in many aspects, such as silvery-white metallic luster, good ductility and plasticity. However, there are also significant differences between them, mainly concentrated in the following aspects:
Difference in density: The density of chromium is 7.19 g/cm3, while the density of nickel is slightly higher, at 8.9 g/cm3.
Difference in melting and boiling points: The melting point of chromium is as high as 1907 degrees Celsius, and the boiling point is as high as 2672 degrees Celsius; in contrast, the melting point of nickel is 1453 degrees Celsius and the boiling point is 2732 degrees Celsius.
Difference in chemical properties: Chromium is known for its excellent corrosion resistance and high hardness, and is often used in the manufacture of stainless steel, steel chrome parts, wheels and aircraft launchers; while nickel is widely used in the manufacture of high-temperature alloy materials, casting molds and metal batteries due to its excellent heat resistance and toughness.
Differences in application in stainless steel: Chromium plays a role in forming a chromium oxide layer that is not easily oxidized in stainless steel; while nickel can improve the strength, ductility and corrosion resistance of the material.
Difference in magnetic properties: Chromium has a stronger magnetic property, so objects that can be easily attracted by a magnet often contain more chromium.
Difference in appearance color: Objects treated with nickel plating have a silvery-white and yellowish appearance; while objects treated with chrome plating have a bright white and bluish appearance.
[2] Different uses
Chromium and nickel have significant differences in application, which are specifically reflected in the following aspects:
The main application areas of chromium: the manufacture of stainless steel, steel chrome parts, wheels and aircraft launchers.
The main application areas of nickel: the manufacture of high-temperature alloy materials, casting molds, metal batteries and alloy materials in the power field.
Differences in application scope: The application of chromium is mainly concentrated in metallurgy, chemical industry, machinery and aviation; while the application of nickel is more extensive, covering medical, aviation, shipbuilding, chemical industry and power and other fields.
In summary, although chromium and nickel are similar in some physical and chemical properties, they have significant differences in their specific uses and application ranges. In various eras and different industrial fields, these metal elements have played a vital role and are indispensable to human production, life and technological progress.
Preparation method of nickel particles
Sol-gel method, this preparation technology has occupied an indispensable position in the field of materials science since it was proposed by French chemist J.J.Ebelmen in 1846. This method uses compounds containing highly chemically active components as precursors, uniformly mixes raw materials in the liquid phase, and undergoes hydrolysis and condensation chemical reactions to form a stable transparent sol system. Subsequently, after the aging process, the colloidal particles in the sol gradually polymerize to construct a gel with a three-dimensional network structure. At this time, the gel network is filled with solvents that have lost fluidity, forming a stable gel state. Finally, through drying and sintering solidification, molecular and even nano-substructured materials, such as nickel particles, can be prepared.
