Anti-rust method of metal box in rainy season

Because of its beautiful appearance, light weight, and good heat dissipation, metal boxes are becoming more and more widely used and are gradually replacing paper boxes in many fields. Under normal circumstances, metal boxes are not easy to rust after surface treatment, but during processing and before assembly, they are easily corroded and rusted by processing fluids, cleaning agents and water. In coastal cities, due to seasonal influences, metal boxes rust are not uncommon. .

The metal box has strong activity and is easily oxidized in the air, but the iron oxide produced can prevent aluminum from being further oxidized like a protective film, so it gives people the impression that it is not easy to rust. However, pure iron is soft and cannot meet the needs of most applications, so alloying elements such as zinc and magnesium are added to greatly increase the hardness and strength of aluminum. Zinc and magnesium are also active metals. Magnesium is more active than aluminum, so metal boxes are more prone to rust.

The metal box contains water and water-soluble substances. The processing fluid and cleaning fluid contain water-soluble components. If they remain on the surface of the metal box, it will absorb moisture in the air and make the surface of the metal box moist. In the rainy season, higher air humidity not only easily produces condensed water on the surface of the metal box, but also water-soluble substances will actively absorb water to make the surface of the metal box moist. In the presence of liquid water, the electrons generated by the ionization of water-soluble substances can promote the corrosion reaction, and the air will corrode the metal box.

An effective measure to make the metal box easy through the rainy season is to use a suitable desiccant, which can effectively absorb the moisture in the air and reduce the air humidity. The choice of desiccant is very important to use silica gel desiccant. The desiccant alone is not enough to meet the strict protection requirements, and a sealed environment is also needed to prevent external moisture from entering the package. The desiccant can prevent the combination of gaseous water and oxygen molecules with the metal. Even if there is a small amount of liquid water on the surface of the aluminum alloy, the anti-rust gas can dissolve in the water to make the solution weakly alkaline and neutralize a part of the acidity brought by it. At the same time, it can be dried with the clay. The use of agent can avoid the emergence of liquid water.

With the development of the quantitative trend of metal boxes, the packaging industry's Christmas gift boxes, chocolate boxes, biscuit packaging boxes and other components are basically tin-plated iron metal boxes. The desiccant anti-rust bag protection program can help us a large number of customers in the packaging industry Successfully passed the rainy season.

With the continuous progress and development of the metal packaging industry, our R&D team is also exploring for customers a more cost-effective and more rigorous anti-rust metal packaging solution.