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In cathodic protection systems, metal equipment is protected primarily through the consumption of anodes. Currently, the main anode materials used in cathodic protection systems include magnesium, aluminum, and zinc. Magnesium and aluminum are more commonly used, while zinc is less commonly used. So, what limits the use of zinc? What considerations should be taken when selecting zinc and its alloys? Today, Jiaozuo Aoxin Anticorrosion will share the following:
I. Understanding the Limitations of Zinc Anodes
Zinc metal has a narrow crystallization temperature range, a low melting point, is easy to fill and form, is difficult to porosify, resists mold sticking, and extends the life of die-casting molds. Therefore, it can be die-cast into a variety of complex, thin-walled castings. These castings are amenable to various surface treatments, exhibit excellent electroplating properties, and maintain excellent room-temperature performance. However, zinc is prone to dimensional shrinkage after die-casting into sacrificial anodes. Therefore, when using zinc alloy anodes, it is best not to add copper to avoid degrading mechanical properties. Furthermore, zinc alloys are prone to aging, so impurity content must be strictly controlled during material selection and smelting.
II: How to Select Zinc and Its Alloy Materials
When selecting zinc and its alloy anode materials, the selection should be based on the intended application, paying attention to the zinc alloy's mechanical properties, tensile strength, maximum fracture resistance, brittleness, plasticity, and hardness. Only by paying attention to various factors, including the precision and workmanship of the zinc anode, can magnesium metal achieve its maximum effectiveness.
After the cathodic protection system is completed and operational, a series of adjustments must be made based on electrode feedback to ensure optimal system performance. After installation, commissioning is required. Before commissioning, the circuitry must be checked for correctness. Short circuits and open circuits must be avoided, as these can have unintended consequences. It is important to ensure that commissioning is completed in one go.
Before installation, all cathodic protection electrodes must be thoroughly inspected. This inspection includes visual inspection to ensure the electrodes are clean and free of damage, as well as connections and resistance checks. Insulation must be ensured. If conditions permit, an anode screen should be constructed around the anode to ensure uniform current flow throughout the cathodic protection system. During construction, strict adherence to the construction drawings is essential, especially ensuring that the auxiliary anode and reference electrode are properly connected.
Derui Corrosion-Resistant Material Co., Ltd. as the region's largest sacrificial anode product R&D and production organization, boasts extensive experience in the design and production of various sacrificial anode protection materials and in providing effective cathodic protection solutions. Its products are of superior quality, with outstanding performance and practical effectiveness, earning them a high reputation and trust from numerous regional construction organizations.
