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Review on corrosion resistance of steel flange fasteners


Date:

2024-03-15

The corrosion resistance of steel flange fasteners is mainly related to its material, manufacturing process and surface treatment. In different application environments, the appropriate fastener material and surface treatment method need to be selected according to the material and operating conditions of France to ensure the tightness and reliability of the system.

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The corrosion resistance of steel flange fasteners is mainly related to its material, manufacturing process and surface treatment. In different application environments, the appropriate fastener material and surface treatment method need to be selected according to the material and operating conditions of France to ensure the tightness and reliability of the system.

First of all, from the material point of view, the commonly used stainless steel flange fastener materials are mainly 304, 304L, 316 and 316L. These materials belong to austenitic stainless steel, which has good corrosion and heat resistance, but its mechanical strength is relatively low. Among them, the yield strengths of 304 and 304L are 205MPa and 170MPa, while the yield strengths of 316 and 316L are 210MPa and 200MPa, respectively. The difference of carbon content leads to the improvement of intergranular corrosion resistance between 304L and 316L. For occasions where higher corrosion resistance is required, materials such as 316L are usually chosen because they not only contain higher molybdenum content, but also lower carbon content, so corrosion and heat resistance are better.

In terms of manufacturing process, the manufacturing process of fasteners will also affect their corrosion resistance. For example, the use of heat treatment processes can improve the mechanical properties of fasteners, but may affect their corrosion resistance. Therefore, there is a need to balance mechanical properties and corrosion resistance in the manufacturing process.

Surface treatment is an important means to improve the corrosion resistance of fasteners. Common surface treatment methods include coating, chemical conversion film and coating. Coating treatment can be formed on the surface of the fastener a layer of metal or alloy coating, such as nickel, chromium, zinc, etc., to enhance its corrosion resistance. Chemical conversion film treatment is to form a stable chemical conversion film on the surface of the fastener by chemical or electrochemical methods to improve its corrosion resistance and oxidation resistance. The coating treatment is to coat the surface of the fastener with a layer of corrosion and high temperature resistant protective coating, such as organic coating, inorganic coating and ceramic coating.

In practical applications, corrosion problems of fasteners are very common. For example, fasteners on cars need to be surface treated to improve their corrosion resistance. Fastener engineers need to take appropriate solutions according to the corrosion problems in actual work, such as changing materials, adjusting manufacturing processes or using more effective surface treatment methods.
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Key Words:

flange,steel flange