High Temperature Corrosion Resistance Alloy
High temperature corrosion resistance is one of the most desirable performance characteristics of modern engineering materials. Numerous nickel-based alloys such as Ni-Cr-Co alloys are used to improve high temperature corrosion resistance and serve as important components in industries such as chemical, aerospace and energy.
Ni-Cr-Co alloys are an alloy of nickel, chromium and cobalt, with a large number of micro-alloyed additions from Al, Si, Ti, etc. It is a very versatile material and its composition can be tailored to produce a wide range of properties depending on the intended application.
For high temperature corrosion resistance alloys, the most important elements are nickel, chromium and cobalt. High temperature corrosion resistance is achieved by creating an alloy that is resistant to oxidation, reducing and sulfidation environments. Nickel-based alloys are well known for their excellent corrosion resistance properties, in addition to their exceptional mechanical and physical properties.
Nickel in Ni-Cr-Co alloys provides an additional protection against corrosion due to its high oxidation resistance. The addition of chromium improves the corrosion resistance of nickel and allows the alloy to form a protective layer of chromium oxide on its surface, effectively protecting it from further corrosion. The addition of cobalt, on the other hand, provides strength to the alloy, as well as improves its resistance to abrasive wear.
The high temperature corrosion resistance of Ni-Cr-Co alloys can be further improved by using various fabrication techniques like heat treatment and surface finishing. Heat treatment helps increase the hardness and strength of the alloy, thus improving the material’s resistance to corrosion. Additionally, surface finishing can also be used to provide additional protection by increasing the amount of protective oxide layer on the surface of the alloy.
Finally, Ni-Cr-Co alloys are particularly advantageous in applications requiring high temperature corrosion resistance due to their unique combination of excellent corrosion resistance, strength and resistance to oxidation, along with their relatively low cost. This makes these alloys suitable for numerous applications in the chemical, aerospace and energy industry, including high-temperature structural components, exhaust systems, and industrial pressure vessels.
