Discussion on the Stability of Galvanized Layer of hot-dip galvanized assembly bolted sectional water tank in High-temperature Water Environment

Hot-dip galvanizing process and zinc alloy protective layer
Hot-dip galvanizing is a process that forms a protective layer by melting a layer of zinc or zinc alloy on the surface of steel to prevent corrosion of steel. In this process, metallurgical bonding occurs between zinc and the steel matrix to form a dense and strong protective film. This zinc alloy protective layer performs well at room temperature and in general environments, and can effectively resist the erosion of moisture, oxygen and other corrosive media, ensuring the safety and cleanliness of the water quality inside the water tank. Especially under the condition that the temperature does not exceed 400℃, the zinc alloy layer has high stability and can maintain its protective performance for a long time, providing a reliable anti-corrosion barrier for the water tank.

Changes in zinc layer under high temperature environment
Although hot dip galvanized steel water tank for water treatment perform well under normal conditions, the stability of the zinc layer faces severe challenges in extremely high temperature environments. In high-temperature environments, such as near burning materials or in some high-temperature industrial areas, the temperature may far exceed the melting point of zinc (about 419.5℃). Under such conditions, the galvanized layer will undergo significant physical changes, including melting, evaporation and even blistering.

Zinc layer melting: When the ambient temperature reaches or exceeds the melting point of zinc, the galvanized layer will begin to melt, which not only destroys the original protective structure, but also may cause the zinc liquid to flow, affecting the overall structural strength and sealing of the water tank.
Zinc layer blistering: When the temperature rises sharply, the metallurgical bond between the galvanized layer and the steel substrate may weaken due to the thermal expansion and contraction effect, resulting in bubbles or peeling on the surface of the zinc layer. This phenomenon will significantly reduce the protective effect of the galvanized layer and accelerate the corrosion process of the water tank substrate.
Water pollution risk: The melting or peeling of the zinc layer not only affects the structural integrity of the water tank, but may also release zinc ions into the water body, causing potential pollution to the water quality, especially for water treatment systems that require strict control of water quality. This risk is particularly serious.
Countermeasures and solutions
In the face of the problems that the galvanized layer of hot-dip galvanized assembly bolted sectional water tank may face in high temperature environments, the following measures can effectively improve the high temperature resistance and overall stability of the water tank:

Material selection and optimization: Develop special coating materials suitable for higher temperature environments, such as aluminum alloys or stainless steel, to improve the high temperature resistance limit of the water tank.
Insulation design: Add an insulation layer on the outside of the water tank, such as ceramic fiber, rock wool, etc., to reduce the direct impact of external heat on the inside of the water tank.
Temperature monitoring and early warning system: Install temperature sensors and alarm devices to monitor the temperature changes around and inside the water tank in real time. Once the temperature approaches the critical value, take immediate measures to reduce the ambient temperature or move the water tank to a safe area.
Regular inspection and maintenance: Regularly inspect the appearance of the water tank to promptly detect and deal with problems such as blistering and peeling of the zinc layer to ensure that the water tank is always in good working condition.