Corrosion Resistance of Nickel-based Alloys

(Corrosion Resistance of Nickel-based Alloys)

The main alloying elements are copper, chromium, and molybdenum. It has good
comprehensive performance and can resist various acid corrosion and stress
corrosion. The earliest application (produced in the United States in 1905) is
nickel-copper (Ni-Cu) alloy, also known as Monel (Monel alloy Ni 70 Cu30); in
addition, there is nickel-chromium (Ni-Cr) alloy (nickel-based heat-resistant
alloy) , The heat-resistant corrosion-resistant alloy in the corrosion-resistant
alloy), nickel-molybdenum (Ni-Mo) alloy (mainly refers to Hastelloy B series,
nickel-chromium-molybdenum (Ni-Cr-Mo) alloy (mainly refers to Hastelloy C
series) At the same time, pure nickel is also a typical representative of
nickel-based corrosion-resistant alloys. These nickel-based corrosion-resistant
alloys are mainly used in the manufacture of various corrosion-resistant
environmental components such as petroleum, chemical, and electric power.

Category Nickel-based corrosion resistant alloys mostly have austenitic
structure. In the state of solid solution and aging treatment, there are also
intermetallic phases and metal carbonitrides on the austenite matrix and grain
boundaries of the alloy. Various corrosion-resistant alloys are classified
according to their composition and their characteristics are as follows:

The corrosion resistance of Ni-Cu alloy is better than that of nickel in
reducing media, and the corrosion resistance of oxidizing media is better than
that of copper. It is resistant to high temperature fluorine gas, hydrogen
fluoride and hydrogen fluoride in the absence of oxygen and oxidants. The best
material for acid (see metal corrosion).

Ni-Cr alloy is also a nickel-based heat-resistant alloy; it is mainly used
under oxidizing medium conditions. It is resistant to high temperature oxidation
and corrosion by gases containing sulfur and vanadium, and its corrosion
resistance increases with the increase of chromium content. This type of alloy
also has better resistance to hydroxide (such as NaOH, KOH) corrosion and stress
corrosion resistance.

Ni-Mo alloy is mainly used under the conditions of reducing media corrosion.
It is the best alloy resistant to hydrochloric acid corrosion, but in the
presence of oxygen and oxidants, the corrosion resistance will be significantly
reduced.

Ni-Cr-Mo(W) alloy combines the properties of the above-mentioned Ni-Cr alloy
and Ni-Mo alloy. It is mainly used under the conditions of oxidation-reduction
mixed media. This type of alloy has good corrosion resistance in
high-temperature hydrogen fluoride, in hydrochloric acid and hydrofluoric acid
solutions containing oxygen and oxidants, and in wet chlorine at room
temperature.

Ni-Cr-Mo-Cu alloy has the ability to resist both nitric acid and sulfuric
acid corrosion. It also has good corrosion resistance in some
oxidation-reduction mixed acids.

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(Corrosion Resistance of Nickel-based Alloys)