Nickel-based alloys are excellent corrosion-resistant alloys. NICKEL200 has high corrosion resistance in many substances and even strong corrosive substances. Nickel-based alloys have excellent physical properties and process properties, but they are generally not used casually because of their high price. However, due to the development trend of high main parameters (temperature, working pressure, substance concentration) in the whole process of chemical plants, there are more and more places with highly corrosive substances, and the corrosion standards are becoming more and more stringent. Therefore, commonly used equipment is not only required to resist general corrosion but also more and more resistant to pitting corrosion, stress corrosion, crevice corrosion, etc. When selecting raw materials, not only the one-time project investment cost, but also the cost of maintenance, depreciation, downtime losses, and safety factors must be considered. Therefore, more attention should be paid to the stability of the long-term operation of machinery and equipment. This factor contributes to the increasingly common use of nickel-based alloys with high corrosion resistance.
At this stage, most of the nickel-based alloys commonly used in the manufacturing industry use international standard models. Therefore, the following is a brief and detailed introduction to pure nickel, dominated by the nickel-based deformed aluminum alloy of the American model.
Pure nickel has good corrosion resistance in a hot concentrated lye solution, does not cause alkali ductile stress corrosion cracking, and has excellent corrosion resistance to water, seawater, and high-temperature dry fluorine, but is not resistant to oxidizing acid and aqueous solution with reducing agent and its corrosion resistance. Corrosion of most molten metal materials. It can corrode and become brittle in the gas with high-temperature sulfur content. With the increase of nickel content in stainless steel and nickel-based alloys, the corrosion resistance in dilute hydrochloric acid, sulfuric acid, and ammonium sulfate is significantly enhanced, and the stress corrosion resistance in aqueous sodium hydroxide solution is also significantly enhanced. The corrosion resistance in caustic soda solution is basically positively related to the nickel content.
For a pure nickel, the market generally mainly includes NICKEL200 and NICKEL201.
Nickel Ni+Cobalt Co is higher than or equal to 99
The main use of NICKEL200: It is mainly used to solve the oxidizing halogen system vapor, alkali solution, non-reducing acid salt, organic acid, and other machinery and equipment and components, in the natural environment where the temperature should be less than 315 degrees. The corrosion resistance of NICKEL200: Corrosion is relatively slow in the air, and HCl in various sulfuric acids in the sea has excellent corrosion resistance, but it should be used with caution in HIC acid with high water flow, and it is not easy to use in H3PO4 and HNO3 In H2SO4, which is only used to block gas, it has very good corrosion resistance in HF without water at high temperature, and has excellent corrosion resistance in high-temperature chlorine and HCl, and has excellent corrosion resistance in chlorine and fluorine gas. Corrosion resistance.