Application Significance of Military Packaging Anticorrosion Technology

The manufacture of weapons and equipment is inseparable from iron and steel, and steel products are prone to corrosion. After weapons and equipment are rusted, their performance will be directly affected, which will bring serious damage to wartime. In addition, weapons and equipment have a long storage time and a variety of storage environments. Therefore, it is particularly important for military packaging to prevent rust. It is of great significance to study the technology of military packaging corrosion protection.

1 Military packaging anti-corrosion technology

1.1 Antirust Oil Storage Technology

Since metal corrosion is a result of electrochemical effects caused by oxygen, water vapor and other harmful gases in the air acting on the metal surface, it is effective to protect the metal surface with rust preventive oil and isolate it from various factors that cause corrosion. Prevent metal corrosion. At present, anti-rust oil is mainly made of grease or resin, and anti-rust paint composed of oil-soluble corrosion inhibitor is added. The need to add a corrosion inhibitor is due to the small amount of water and oxygen that can be dissolved in the oil, which alone cannot be used to achieve satisfactory rust protection. Many studies have shown that the adsorption of corrosion inhibitors on the metal surface reduces metal activity is one of the main reasons for rust prevention of rust preventive oils. The main types of corrosion inhibitors include petroleum sulfonate, aluminum stearate, zinc naphthenate, and benzotriazole. Different corrosion inhibitors have different characteristics. For example, aluminum stearate has good salt water resistance, and benzotriazole has excellent anti-rust effect on copper and alloys. In practice, a variety of corrosion inhibitors are often added to achieve a satisfactory rust prevention effect. Antirust oil is required to have a certain thickness and continuity during use, and the coating integrity can effectively play a role in rust prevention.

In the military packaging, the rust-proof oil storage technology is widely used in the protection of the projectile, thus causing some problems. During the investigation of the troops, it was found that some domestic products protected by oil seals had reached the purpose of rust prevention, but the troops were very troublesome in use. The first is that it is difficult to remove oil and it takes a lot of time and effort. Secondly, it takes a lot of rags to remove oil, which increases the logistic workload. In addition, the deoiled ammunition is susceptible to moisture deterioration due to the loss of oil seal protection. The double-35 antiaircraft bomb used abroad is also sealed by oil. However, it can be used without degreasing, and it is convenient for maintenance. Therefore, military packaging should not only consider the anti-rust effect when selecting the type of anti-rust oil, but also consider whether it is convenient when the troops use it.

1.2 Vapour-phase rust-proof packaging technology

Vapor-phase rust-proof packaging technology is a technique for rust-proofing metal products in a sealed packaging container using a vapor phase corrosion inhibitor. The vapor phase corrosion inhibitor is a chemical substance that slowly volatilizes the corrosion inhibition atmosphere at room temperature and adsorbs on the surface of the metal product, effectively suppressing the corrosion of the metal in the atmosphere. Because the vapour phase rust-proof packaging technology does not require coating on the surface of metal products, this anti-corrosion packaging method does not affect the appearance of weapon equipment. When using weapons and equipment, it also omits the procedures for detachment. Therefore, it is used in domestic and foreign military packaging. Has been widely used. When it is used in conjunction with a suitable anti-rust oil and moisture-tight sealed inner package, it can solve the problem of long-term storage of weapons and equipment. Different vapor phase inhibitors have different mechanisms of action. Vapor phase inhibitors with -NO2 and -OH groups are believed to act as anode passivations on the metal surface to retard the electrochemical process of the cathode. A vapor phase inhibitor with a cationic group of dicyclohexylamine nitrite is cation-adsorbed on the metal surface to form a hydrophobic film. Both the role of the corrosive medium and the electrochemical reaction ability of the metal are shielded. The benzotriazolone corrosion inhibitor is considered to form a stable complex film on the metal surface to prevent metal corrosion. There are many compounds that have gas phase corrosion inhibition, and the use of vapor phase corrosion inhibitors is appropriately selected according to different protection targets. The best proven rust preventive effect for ferrous metals is dicyclohexylamine nitrite, which is also the most widely used vapor phase corrosion inhibitor for military products. For non-ferrous metals, dicyclohexyl chromic acid, dicyclohexylamine phosphate, benzotriazole, and the like are commonly used. Since light and heat can cause decomposition of corrosion inhibitors, vapor phase inhibitors should be protected from light and heat during their use and storage. Generally, they should not be stored in environments above 60°C or under direct sunlight. The development direction of vapor phase corrosion inhibitors is to study non-toxic or low-toxicity varieties, develop multi-potential, versatile gas phase corrosion inhibitors, and use it in the form of multi-purpose development to simplify packaging and reduce costs.

1.3 Dry and Moisture Packing Technology

Temperature and humidity are the main causes of the corrosion, destruction, and loss of use of military equipment. A variety of military equipment requires a certain level of humidity during packaging and storage. For example, the relative humidity limit of metal products is 10% to 45%, and corrosion is generally not observed below 45% relative humidity. Dry moisture control packaging technology uses molecular sieves, silica gel and other desiccants to absorb moisture in sealed containers, so that the products are in a dry sealed environment, thus protecting products from corrosion, deterioration, mildew, etc. Practice has proved that the storage of dry and moisture-control packaging technology is an economical and effective method. The military in various countries has used this method to develop large-scale equipment such as naval vessels, army tanks and artillery, and to archive weapons, electronics, and so on. Electrical instrument and military aircraft that integrates various materials. It has become the best reliable method for the long-term or short-term storage of military equipment by the armed forces of the sea, land and air. There is a trend for further research and application.

The Danish and Swedish Air Forces used dry air sealed packaging to successfully seal aircraft weapon systems. Denmark thus saves approximately 2 million DKK per year and saves 25% of maintenance personnel; Sweden therefore extends the average time between failures of electronic and electrical instruments, extending the average time for radar failures by 73%, and the aircraft cabin instrument lifetime With an extension of 155%, the total machine life has been extended by 26%. Together, these costs add up to approximately SEK 25 million per year. The German Air Force has also achieved good results with the dry air storage method for the storage of military aircraft, which was developed by Germany. 6 types of dynamic dehumidification systems for long-term storage of large military equipment, ie, dry room (MRZ), dry room (LEH), matched flexible packaging (ASH), universal flexible packaging (USH), modules Protective shed (MSB) and so on. The protective canopy for German storage of anti-tank guns consists of a bracket and a coated fabric envelope. The internal pressure of the 10 mm water column is naturally maintained by the dryer. The latter two types of sealed packaging are commonly used for various large military equipment, such as leopard tanks and Weasel infantry fighting vehicles. In addition, the United States, the United Kingdom, France, Canada, the Netherlands, and Israel have also adopted dry air systems for the storage of aircraft and weapon systems.

2 Some current problems

In military packaging, rust prevention of packaged goods is considered at the same time. Some ignorance of the rust prevention of the packaging container itself, especially the long-term rust prevention problem. Many packaging containers do not have problems at first, but over time problems have emerged. Especially in coastal areas, the requirements for corrosion protection are higher under conditions of high temperature, high humidity, and high salt content in air. During the investigation of the troops, the author heard relatively strong reflections of some iron drum (carton) packaging. Due to the long time after the iron drum (carton) packaging had some rust, the iron skin did not separate along its own preset stress line. Pull off the iron sheet and it will not open. In addition, iron cages in iron cages also rusted. Some of the metal locks of various packing boxes also cause corrosion, and the corrosion of the locks on the open boxes is even more serious. According to experiments, if the steel is rusted by 1%, its strength will be reduced by 5% to 10%. After the lock rust, it directly affects the tightness of the packing box. This should pay attention to the rust prevention of packaging materials.

3 Conclusion

Military packaging is an inseparable part of weapons and equipment. It is a partner of weapons and equipment and plays a decisive role in the logistics support of modern warfare. Anti-rust packaging technology is one of many military packaging technologies and plays an extremely important role in ensuring the tactical performance of weaponry and equipment. Actively researching various advanced military rust-proof packaging materials and technologies and applying them to the packaging of various weapons and equipment, not only can reduce the requirements for storage environment conditions, but also can adapt to transportation and storage in the field and in war conditions. It is very much in line with the requirements of modern warfare for field equipment storage conditions, and it is of great significance to improve the safe storage and reliability of our military's weapons and equipment, and the flexible mobility and rapid response capability of our troops.