Gi sheet metal

Gi sheet metal exhibits excellent performance in humid environments, mainly due to the galvanized layer on its surface. The following is a detailed analysis of the performance of gi sheet metal in humid environments:

1. Excellent corrosion resistance

1. The protective effect of the galvanized layer: The galvanized layer can react with oxygen and water vapor in the air in a humid environment, forming a dense zinc oxide film. This thin film can effectively prevent further corrosion reactions and protect the steel plate substrate from erosion.

2. Sacrificial anode protection: When the galvanized layer is partially damaged, the zinc layer will act as a sacrificial anode and be preferentially corroded, thereby protecting the steel plate substrate from further corrosion. This protective mechanism is particularly important in humid environments, as they accelerate the occurrence of corrosion reactions.

2. Possible problems in humid environments

1. White rust phenomenon: In humid and poorly ventilated environments, white or gray powdery corrosion products, known as white rust, may form on the surface of gi sheet metals. The formation of white rust is mainly due to the reaction between the galvanized layer and gases such as carbon dioxide in humid air. However, white rust usually does not have a serious impact on the anti-corrosion performance of the coating, and will gradually disappear as the surface of the galvanized part dries.

2. Corrosion aggravation: If gi sheet metal is exposed to a humid environment for a long time and poor ventilation, the corrosion reaction may intensify. This may lead to the gradual depletion of the galvanized layer, ultimately affecting the service life of the steel plate.

3. Protective measures

1. Improve storage and transportation conditions: When storing and transporting gi sheet metal in humid environments, it is advisable to avoid close stacking and ensure sufficient ventilation space between the plated parts. Meanwhile, it is advisable to avoid direct contact between galvanized sheets and damp floors or walls as much as possible.
2. Cleaning and drying: Regularly clean and dry the surface of gi sheet metal to remove impurities such as dust and oil stains, and prevent them from becoming a trigger for corrosion.

3. Adopting protective coating: Coating a layer of organic coating (such as epoxy paint, acrylic paint, etc.) on the surface of gi sheet metal can form a physical barrier, further isolating air and moisture, and improving corrosion resistance.

4. Application Fields

Due to its excellent corrosion resistance in humid environments, gi sheet metals are widely used in various fields such as construction, home appliances, and automobiles. For example, in the construction industry, gi sheet metal is commonly used to make corrosion-resistant industrial and civil building roof panels, roof grilles, etc; In the home appliance industry, gi sheet metal is commonly used to make the outer shell of household appliances such as refrigerators and washing machines.
Overall, gi sheet metal has excellent corrosion resistance in humid environments, but appropriate protective measures still need to be taken to extend its service life.