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In the indoor atmosphere, Ni200 and Ni201 generally maintain a bright metallic luster. In the outdoor atmosphere, corrosion is slow due to a thin protective film on the surface. However, in the S02 industrial atmosphere, the corrosion rate increases with the increase of S02 content, and their cor...Read more »
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Pure nickel is a silver-white transition metal with a metallic luster and is one of the elements that have strong ferromagnetism at room temperature (the other two elements are iron and diamond). In the entire temperature range below the melting point, the crystal structure of nickel is face-cent...Read more »
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In 1960 H. Coriou and his colleagues first announced that Inconel 600 alloy produces intergranular stress corrosion in degassed high-temperature pure water. The authenticity of the Inconel 600 alloy has been questioned for more than 20 years, and eventually the water in the nuclear power plant is...Read more »
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In the caustic environment of NaOH aqueous solution, Ni-Cr alloy and Ni-Fe-Cr alloy have good stress corrosion resistance. Under a given medium, the stress corrosion behavior of the alloy is affected by the content of Cr and Ni in the alloy. Heat treatment conditions are constrained. The test res...Read more »
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Nickel-base and iron-nickel-based corrosion-resistant alloys have been successfully applied in some dangerous service conditions because of their good stress corrosion resistance, good manufacturing performance, good toughness, and wide applicability to corrosive environments. However, in a wide ...Read more »
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Puncture corrosion and crevice corrosion are commonly encountered localized corrosion. After the point corrosion and crevice corrosion environments are determined, the alloy’s resistance to such localized corrosion depends on the composition of the alloy. Chromium and molybdenum play the mo...Read more »
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The typical representative of Ni-Mo alloy is Hastelloy B with 28% Mo. Since its application in the industry in 1929, its weldment has appeared near the weld seam. J mouth corrosion, and intergranular corrosion in the heat affected zone (HAZ). The phenomenon of welding deterioration seriously affe...Read more »
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Ni-Cr-Mo type corrosion-resistant alloy, which is resistant to both reducing medium and oxidizing medium, is a kind of corrosion-resistant alloy system with wide applicability. Among the most representative and widely used alloys of this type are Hastelloy® c with 16 070 Mo, introduced in the 193...Read more »
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The commonly used Ni-Cr alloy is the more widely used Inconel 600. The sensitizing temperature range of this alloy is very wide. At 300-850°C, Cr23c6 is precipitated. The intermetallic corrosion of Inconel 600 with a carbon content of only 0.017% is related to the sensitization temperature and ti...Read more »
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Intergranular corrosion is a type of corrosion that occurs in a narrow area between grains of a metallic material and is a type of localized corrosion. Early nickel-base and iron-nickel-based corrosion-resistant alloys were almost completely corroded. In the middle of the 20th century, the corros...Read more »
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The characteristics of HCI are similar to those of dry CI. There is also a critical temperature that causes the corrosion rate of metal materials to increase sharply. For some corrosion test data, see Table 2-27, Table 2-28, and Table 2-29. Combining these corrosion data, it can be considered tha...Read more »
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HF gas is a common medium for certain chemical processing. In high temperature hydrogen fluoride, Ni201, monel400, inconel 600, C-276 and 00Cr16Ni65Mo2Ti alloys all have suitable corrosion resistance, and have been successfully applied to practical engineering. Some corrosion test data are shown ...Read more »
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Fluorine is the most powerful and most active halogen element. Its strongest oxidation potential makes it form compounds with all common elements. This property determines that it can react directly with the metal to form metal fluorides. The properties of the fluoride protective film are directl...Read more »
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Phosphoric acid is a kind of reducing inorganic acid, also called non-oxidizing acid. Its corrosiveness to the material depends on the type of phosphoric acid. Phosphoric acid and wet-process phosphoric acid are two types of phosphoric acid currently used in industrial applications. The former is...Read more »
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The corrosion resistance of nickel-based and iron-nickel-based corrosion resistant alloys in nitric acid depends on the chromium content of the alloy. The higher the chromium content in the alloy, the better the corrosion resistance. G-30 alloy and 690 alloy exhibit the best corrosion resistance ...Read more »
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In caustic, universal austenitic stainless steels can only be used below 100oC in concentrations below 50%. Nickel and its corrosion resistant alloys exhibit excellent resistance to caustic alkali corrosion, and the corrosion resistance of the alloy increases as the nickel content increases. Prac...Read more »
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HF acid is a reductive inorganic acid widely used in chemical processing. The industrially applicable HF acid concentration ranges from 30% to 70% HF aqueous solution and anhydrous HF. Although chemically classified, HF acid is a weak acid relative to hydrochloric acid and sulfuric acid, but its ...Read more »
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Full corrosion can occur in acids, salts, aqueous alkalis, and some corrosive gases. When the composition of the alloy is confirmed, the two dominant factors affecting its overall corrosion resistance are material and environmental effects. Material factors are heat treatment and thermal history,...Read more »
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Hydrochloric acid is one of the most aggressive corrosive reducing acids, and its corrosion to metal materials was a major technical problem that the corrosion resistant structure was difficult to solve. The corrosion rate of industrial pure nickel 200,201 and nickel-copper alloy Monel 400 in roo...Read more »
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Corrosion in general: In corrosive environments, bare metal surfaces are uniformly thinned by chemical and electrochemical reactions, also known as uniform corrosion, often at the corrosion rate g / m².h or the corrosion rate mm / a to determine the alloy’s Corrosion resistance. Local corro...Read more »
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In the case of a large amount of Cr, Mo, W and other alloying elements, high contain nickel alloys can still maintain the austenitic structure, it is still austenitic alloy easy forming, easy welding, etc., which is widely favored by this alloy The main reason. In the iron-based austenitic stainl...Read more »
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Stainless steel processing technology refers to the performance of stainless steel with stainless steel shear, folding, bending, welding and other mechanical processing of the final production of stainless steel products needed for the process, in the process of stainless steel processing with a ...Read more »
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Stainless steel corrosion resistance can be mainly due to the surface covered with a layer of very thin (about 1nm) dense passivation film, the film 1n corrosion medium isolation, stainless steel protection is the basic barrier. Stainless steel passivation has a dynamic character and should not b...Read more »
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Austenitic stainless steel has good corrosion resistance, high temperature oxidation resistance, good low temperature performance and excellent mechanical properties plus r Health. Therefore widely used in chemical, petroleum, power, nuclear engineering, aerospace, marine, pharmaceutical, light i...Read more »
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Electrolytic processing is the use of metal in the electrolyte occurs in the principle of electrochemical anodic dissolution of the workpiece forming a special processing method. Processing, the workpiece connected to the positive DC power supply, the tool connected to the negative pole, maintain...Read more »