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Nickel-based corrosion resistant alloy: 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 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) etc. 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 parts such as petroleum, chemical industry, and electric power.
From the element point of view, is the nickel-based corrosion resistant alloy austenitic?
Yes, in the state of solid solution and aging treatment, there are intermetallic phases and metal carbonitrides on the austenite matrix and grain boundaries of the alloy. The classification of various corrosion-resistant alloys and their characteristics are as follows:
The corrosion resistance of Ni-Cu alloy is better than nickel in reducing media, and the corrosion resistance in oxidizing media is better than 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. Resistance 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 corrosive media. It is the best alloy resistant to hydrochloric acid corrosion, but in the presence of oxygen and oxidants, the corrosion resistance will decrease significantly.
Ni-Cr-Mo(W) alloy combines the properties of the above-mentioned Ni-Cr alloy and Ni-Mo alloy. Mainly used in oxidation-reduction mixed media conditions. 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, and also has good corrosion resistance in some oxidation-reduction mixed acids.
Next, let's talk about the relevant properties of nickel-based wear-resistant alloys.
The main alloying elements are chromium, molybdenum, and tungsten, but also contain a small amount of niobium, tantalum and indium. In addition to wear resistance, its oxidation resistance, corrosion resistance, and welding performance are also good. It can manufacture wear-resistant parts and can also be used as a coating material, which can be coated on the surface of other base materials through surfacing and spraying processes. Nickel-based composite powders include self-fluxing alloy powder and non-self-fluxing alloy powder.
Adding an appropriate amount of B and Si to the nickel alloy powder forms a nickel-based self-fluxing alloy powder. The so-called self-fluxing alloy powder is also called eutectic alloy, hard-faced alloy, is a series of powders formed by adding alloy elements (mainly boron and silicon) that can form low melting point eutectic in nickel, cobalt, and iron-based alloys material. Commonly used nickel-based self-fluxing alloy powders are Ni-B-Si alloy powder, Ni-Cr-B-Si alloy powder, Ni-Cr-B-Si-Mo, Ni-Cr-B-Si-Mo-Cu, High-molybdenum nickel-based self-fluxing alloy powder, high-chromium-molybdenum-nickel-based self-fluxing alloy powder, Ni-Cr-WC-based self-fluxing alloy powder, high-copper self-fluxing alloy powder, tungsten carbide dispersive nickel-based self-fluxing Alloy powder, etc.
Nickel-based precision alloys include nickel-based soft magnetic alloys, nickel-based precision resistance alloys, and nickel-based electric heating alloys. The most commonly used soft magnetic alloy is Permalloy with about 80% nickel, which is an important core material in the electronics industry. The main alloying elements of nickel-based precision resistance alloys are chromium, aluminum, and copper. This alloy has high resistivity, low temperature coefficient of resistivity and good corrosion resistance, and is used to make resistors. Nickel-based electric heating alloy is a nickel alloy with 20% chromium. It has good oxidation and corrosion resistance and can be used for a long time at a temperature of 1000 to 1100 ℃. The above constitutes several major categories of nickel-based alloys.
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