Choosing the Right Material for Chloride Corrosion

When it comes to combating chloride corrosion, industrial processes across various sectors—from water treatment to pulp and paper industries, and even marine applications—face this challenge head-on. Chlorides pose significant risks to equipment durability, making it crucial to choose the right materials for fasteners. This article explores some of the best materials that provide reliable protection against chloride corrosion, ensuring your equipment remains resilient under demanding conditions.

One standout material is titanium, which boasts exceptional resistance to chloride-based compounds, including solutions like hypochlorites, chlorates, and even chlorine dioxide. Titanium Grade 5 fasteners, in particular, stand out not only for their excellent chloride resistance but also for their impressive tensile strength of up to 148 ksi. However, keep in mind that titanium should never be used in environments involving dry chlorides, as it can corrode rapidly under those conditions.

For a more cost-effective option, duplex steel fasteners present a solid choice, particularly when dealing with localized corrosion like pitting or stress corrosion cracking. Duplex 2205 and Super Duplex 2507 are popular grades known for their enhanced strength and chloride resistance, making them ideal for high-stress environments.

Another contender is AL6XN, which combines strong chloride resistance with the ability to function effectively at high temperatures up to 1000°F. While it offers moderate resistance to general chemical corrosion, its versatility makes it a go-to material in challenging conditions.

Lastly, Alloy 20 fasteners provide a balanced approach to corrosion resistance, offering commendable performance against chlorides as well as other aggressive chemicals like sulfuric acid. With an upper operating temperature of 1000°F, they represent a middle-ground solution that balances cost with durability.

In conclusion, selecting the appropriate fastener material depends largely on the specific demands of your application. Whether you need premium protection, economic efficiency, or a balance between the two, understanding these options can help safeguard your equipment from chloride corrosion’s detrimental effects.

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