1. Why can't galvanized coils of different materials be stored together?
There are two main reasons: First, to prevent confusion and misuse. If galvanized coils of different materials (such as cold-rolled and hot-rolled substrates, or galvanized and aluminized zinc) are stored together, it is easy to take the wrong material later, affecting the quality of the project. Second, there is a scientific limitation. When two metals with different electrode potentials come into contact in a humid environment, a potential difference will be formed, causing galvanic corrosion and accelerating the rusting and damage of the metals.
2.What are the specific requirements for prohibiting mixed storage, and are there any clear regulations?
According to industry regulations, "Steel of the same type or specification but different steel grades should not be mixed and stacked in the same finished product storage area." This means that even if galvanized coils appear to have identical specifications and dimensions, they cannot be stored together if their base material, strength grade, or production standards differ. Furthermore, galvanized coils must be stored separately from corrosive chemicals such as acids, alkalis, and salts.
3. What scientific principles should be followed when storing galvanized coils?
In practice, the principle of "categorized storage and batch storage" should be followed. When different types of metal equipment are stored in the same location, a clear distance must be maintained to prevent contact corrosion. Specifically, the following points must be observed: Different materials (such as cold-rolled and hot-rolled substrates) should be placed in separate areas with a spacing of at least 1 meter; galvanized coils of different specifications and batches should also be stacked separately according to their order of arrival at the warehouse; direct contact between galvanized coils and metals with large potential differences, such as copper, lead, and stainless steel, is strictly prohibited; in addition, an inspection passage of about 0.5 meters should be left between stacks to facilitate daily management and inspection.
4. Can the mixed storage requirements be relaxed in a relatively well-maintained indoor warehouse?
No. Corrosion typically requires the presence of electrolytes (such as humid air or a water film). Even in seemingly dry indoor environments, the effects of electrode potential differences become apparent once air humidity increases or temperature differences cause condensation. Therefore, regardless of whether it's indoors or outdoors, products of different materials must be stored separately, and storage locations should avoid humid environments. It is recommended to keep the relative humidity below 70%. Proper environmental control can extend the service life of galvanized products by 3 to 5 years, a fact reflected in many standards (such as ASTM A123).
5. What if warehouse space is limited and galvanized coils of different materials must be placed in the same area?
If warehouse space is limited and galvanized coils of different materials must be placed in the same stack, clear separation markings are essential. Specifically, physical barriers can be placed between different materials, such as wooden strips or rubber mats. At the same time, ensure sufficient spacing between materials to avoid direct contact, especially in humid environments. Furthermore, adhere to the "first-in, first-out" principle, shorten the inventory cycle, and it is recommended to use the materials within 3-6 months, and regularly check the surface condition of the materials.