In coal chemical equipment, the corrosion properties of nickel-based alloys, Hastelloys and high-temperature alloys are very important because these materials need to work in high temperature, high pressure and corrosive media environments. The following is an introduction to the requirements for the corrosion properties of these materials and methods of corrosion testing and evaluation.
1. Corrosion performance requirements
In coal chemical equipment, nickel-based alloys, Hastelloys and high-temperature alloys need to have good corrosion resistance and be able to withstand the corrosion effects of high temperature, high pressure and corrosive media. Specific requirements are as follows:
(1) Resistance to high-temperature oxidation corrosion: In high-temperature oxidation environments, materials need to be able to resist oxidation corrosion and avoid the generation of oxides and other corrosion products.
(2) Hydrogen sulfide corrosion resistance: In hydrogen sulfide-containing media, materials need to be able to resist the corrosive effects of hydrogen sulfide and avoid the generation of corrosion products such as sulfide.
(3) Resistance to acid and alkali corrosion: In acid and alkali media, materials need to be able to resist the corrosive effects of acids and alkali to avoid the production of acid and alkali products.
(4) Resistance to chloride ion corrosion: In media containing chloride ions, materials need to be able to resist the corrosive effects of chloride ions to avoid the generation of corrosion products such as chloride.
2. Corrosion testing and evaluation methods
In order to evaluate the corrosion resistance of materials, corrosion testing and evaluation are required. Commonly used corrosion test methods include cup test, electrochemical corrosion test and immersion test.
(1) Cup test
The cup test is a simple and easy corrosion test method suitable for evaluating the acid and alkali resistance, oxidation resistance and hydrogen sulfide resistance of materials. During the test, the material to be tested is placed in a cup containing corrosive medium, and then the corrosion test is performed at a certain temperature and time. After the test, the corrosion performance of the material can be evaluated by observing parameters such as surface morphology, weight loss, and chemical composition of the specimen.
(2) Electrochemical corrosion test
The electrochemical corrosion test evaluates the corrosion performance of the material by measuring parameters such as corrosion current and potential of the material under electrochemical conditions. During the test, the material to be tested is used as a working electrode, placed in a battery containing a corrosive medium, and then the potential and current changes of the working electrode are measured by applying an external voltage or current to evaluate the corrosion performance of the material. Commonly used electrochemical corrosion test methods include polarization curve method, AC impedance method and scanning electron microscope.
(3) Soaking test
The immersion test is to directly immerse the material to be tested in the corrosive medium to simulate the corrosive environment under actual working conditions, thereby evaluating the corrosion resistance of the material. During the test, the material to be tested is placed in a container containing corrosive media, and then the corrosion test is performed at a certain temperature and time. After the test, the corrosion performance of the material can be evaluated by observing parameters such as surface morphology, weight loss, and chemical composition of the specimen.
When evaluating the corrosion performance of materials, multiple factors need to be considered, such as test conditions, medium composition, specimen shape, and material surface state. Therefore, it is necessary to select appropriate corrosion test methods and evaluation indicators based on actual working conditions and equipment requirements to accurately evaluate the corrosion resistance of materials.
3. The impact of material corrosion properties on the reliability and life of coal chemical equipment
The corrosion properties of materials have an important impact on the reliability and life of coal chemical equipment. If the corrosion resistance of the materials used is insufficient, problems such as corrosion, cracking, and breakage may easily occur, leading to equipment failure and affecting the reliability and life of the equipment.
Nickel-based alloys, Hastelloys and high-temperature alloys have excellent corrosion resistance and can work in high temperature, high pressure and corrosive media environments, effectively avoiding the generation of corrosion and other corrosion products, thereby extending the service life and reliability of the equipment sex. Therefore, it is widely used in coal chemical equipment, such as petrochemical reactors, catalytic crackers, refining hydrogenation equipment, gasifiers, etc.
When selecting materials, it is necessary to comprehensively consider the actual working environment and equipment requirements, and select materials with excellent corrosion resistance. At the same time, during equipment operation and maintenance, appropriate measures need to be taken to protect equipment materials and avoid corrosion and other damage.
Tianjin Anton Metal Manufacture Co., Ltd. is a company specializing in the production of various nickel-based alloys, Hastelloy alloys and high-temperature alloy materials. The company was established in 2001 with a registered capital of 16.8 million, specializing in the production and sales of alloy materials. Anton Metal’s products are widely used in aerospace, chemical industry, electric power, automobile, nuclear energy and other fields, and can also provide customized alloy material solutions according to customer needs. If you need to know the price consultation of alloy materials or provide customized alloy material solutions, please feel free to contact the sales staff.
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Post time: Sep-09-2023
