Vapor-phase rust-proof packaging technology

Rust-proof packaging is a packaging technique that protects packaged metal products from rust by adding rust-preventing substances to the packaging itself or to the packaging container. Due to the features of simple operation, instant effect, low cost, and good anti-rust effect, vapor-phase anti-rust has become the mainstream of anti-rust packaging technology.

Why does metal corrosion occur?
When the metal is in contact with the surrounding medium, the resulting electrochemical damage is called corrosion.

In general, metals contain various impurities. There is a potential difference between the metal and impurities, which generates electron flow. In addition, moisture in the atmosphere attaches to the surface of the metal and forms a water film. Various impurities in the oxygen and air can cause impurities. Dissolves in the water film and reacts with the metal ions to destroy the metal surface and cause corrosion. Under normal conditions, metal will rust whenever oxygen and water are present.

The air environment, temperature, and humidity all affect the corrosion of metals. Serious air pollution, high sulfur content in the atmosphere will make the metal corrosion more serious; Second, at the same temperature, the higher the relative humidity, the faster the corrosion rate; at the same relative humidity, the higher the temperature, the higher the corrosion rate. fast.

Since most of the packaging materials themselves have a certain permeability and moisture permeability, moisture and oxygen can be brought into contact with the surface of the metal products to be packaged through the packaging materials. Furthermore, due to the cracking and damage of the packaging materials, the packaged products will be seriously rusted. .

Commonly used metal rust prevention technology

For a long time, commonly used anti-rust technology is to apply anti-rust oil (commonly known as butter) on the surface of metal to isolate the metal surface from air and water so as to achieve the purpose of rust prevention. However, this method will lose its effect because the anti-rust oil itself will be oxidized. At the same time, it will take time and effort to remove the protective layer, and it is neither hygienic nor safe, and it will also adversely affect the environment. The use of desiccant to prevent rust is also a commonly used method. It has the advantages of low cost, simple operation, safety and environmental protection, and easy removal of protective packaging. However, it has a short effective time and is affected by the influence of the ambient temperature; it uses special dehumidification equipment for metal. Although the rust-proof effect of the material is good, it is costly, time-consuming and labor-intensive, and the operation is complicated.

VCI technology features

Vapor phase anti-rust technology is to continuously produce corrosion-resistant gas through vapor phase anti-rust agent, and to inhibit the corrosion reaction function in the enclosed space of the package or package to protect the metal products in the packaging material. In the packaging container, vapor-phase rust inhibitor molecules diffuse rapidly and adhere to the metal surface to form a protective film, cutting off the displacement of metal ions from the anode to the cathode, and the vapor phase rust inhibitor particles can be automatically adjusted according to the external environment to make the metal Completely isolated from external water, acid, salt, etc., to eliminate the conditions of metal corrosion.

Vapor-phase rust inhibitors can be sprayed or transferred to kraft paper, plastic film, and other packaging materials. This new antirust mechanism has many unparalleled advantages compared to traditional rust prevention methods. After the metal material is packaged or sprayed, the vapor rust inhibitor molecules begin to diffuse. They can penetrate into corners where traditional rust-proof oils cannot cover, preventing rust and no dead ends; vapor phase anti-rust molecules have long retention time for active ingredients. Achieve more than 10 years of rust protection period; even if there is moisture on the metal surface or the outside air is very moist, the rust inhibitor can also form a protective film on the metal surface to prevent the metal from corrosion rust; the air permeability of the rust-proof packaging material made Extremely low moisture permeability, waterproof, moisture, oil, chemical resistance characteristics. In addition, the special advantage of this rust prevention method is that different methods can be adopted to achieve flexible operations for different rust-proof target materials and different rust-proof period requirements. For example, for a material with a rust-proof period of only 1 week to 1 month, a rust-preventive liquid spray method may be used to facilitate rust-prevention treatment, and the rust-proof purpose may not be achieved even if the material is packaged; For devices with a rust-preventive period of 1 to 2 years, general sealed packages can be used. For devices with a rust-preventive period of up to 10 years, special rust inhibitor formulations can be used and aluminum foil laminated film bags can be used for sealed packaging. You can. When using materials that require anti-rust treatment, the traditional method must first remove the anti-rust oil on the surface of the material before using it. With this method, no matter which treatment method is used, the package can be immediately removed and used, and it is simple and clean. Safe, non-polluting, can also be used repeatedly after rust-proof packaging.