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Nickel-based corrosion-resistant alloys are nickel-based metals that maintain stability in corrosive media. Their nickel content typically exceeds 50%. Corrosion-resistant alloys with nickel contents exceeding 30% and a total nickel-iron ratio exceeding 50% are called iron-nickel-based corrosion-resistant alloys.

Monel alloy (nickel-copper alloy) was developed in the United States in 1905, marking the first application of this material. Germany subsequently produced Ni-Cr-Mo alloys in 1920. China began research and development in the 1950s, developing over ten grades by the late 1970s. These alloys are classified into six major series based on composition: Ni-Cu, Ni-Cr, and Ni-Mo. Properties are optimized through solution and aging treatments.

Nickel-based corrosion-resistant alloys generally have an austenitic structure. In the solution and aging state, intermetallic phases and metallic carbonitrides are present in the austenite matrix and grain boundaries of the alloy. Various corrosion-resistant alloys are classified by composition and their properties are as follows:
Ni-Cu alloys offer superior corrosion resistance to nickel in reducing media and superior corrosion resistance to copper in oxidizing media. In the absence of oxygen and oxidants, they are the best materials for high-temperature fluorine gas, hydrogen fluoride, and hydrofluoric acid (see Metal Corrosion).
Ni-Cr alloys are primarily used in oxidizing media. They resist high-temperature oxidation and corrosion from gases containing sulfur and vanadium, with their corrosion resistance increasing with increasing chromium content. These alloys also have good resistance to hydroxides (such as NaOH and KOH) and stress corrosion.
Ni-Mo alloys are primarily used in reducing media. They offer the best resistance to hydrochloric acid corrosion, but their corrosion resistance decreases significantly in the presence of oxygen and oxidants.
Ni-Cr-Mo(W) alloys combine the properties of the aforementioned Ni-Cr and Ni-Mo alloys. Primarily used in mixed oxidizing and reducing media, these alloys exhibit excellent corrosion resistance in high-temperature hydrogen fluoride gas, hydrochloric acid and hydrofluoric acid solutions containing oxygen and an oxidant, and wet chlorine gas at room temperature.
Ni-Cr-Mo-Cu alloys are resistant to both nitric acid and sulfuric acid, and also exhibit excellent corrosion resistance in some mixed oxidizing and reducing acids.

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