What is the role of container desiccant in preventing corrosion in containers?

As a supplier of container desiccants, I’ve witnessed firsthand the transformative impact these products can have on protecting goods during transit. The shipping industry is fraught with challenges, and one of the most prevalent issues is corrosion within containers. In this blog, we’ll explore the significance of container desiccants in preventing corrosion and how they safeguard your valuable cargo. Container Desiccant

Understanding Corrosion in Containers

Corrosion is a natural process that occurs when metals are exposed to oxygen and moisture. In the context of container shipping, the enclosed environment can create a perfect storm for corrosion to take hold. Containers are often subjected to varying temperatures and humidity levels as they travel across different climates and regions. When warm, moist air enters the container and then cools, condensation forms on the surfaces of the container and the cargo inside. This moisture can lead to the oxidation of metal components, causing rust and corrosion.

The consequences of corrosion in containers can be severe. It can damage the structural integrity of the container itself, leading to potential safety hazards. Moreover, it can ruin the cargo, resulting in financial losses for both the supplier and the customer. Products made of metal, such as machinery, electronics, and automotive parts, are particularly vulnerable to corrosion. Even non – metallic items can be affected indirectly, as the presence of rust particles can contaminate and damage them.

How Container Desiccants Work

Container desiccants are designed to absorb moisture from the air inside the container, thereby reducing the relative humidity to a level where corrosion is less likely to occur. These desiccants work through a process called adsorption or absorption.

Adsorption is a surface – phenomenon where molecules of water adhere to the surface of the desiccant material. For example, silica gel is a common desiccant that adsorbs water vapor onto its porous surface. As the water molecules are attracted to the silica gel, the humidity inside the container decreases.

Absorption, on the other hand, involves the desiccant material taking in water molecules into its structure. Calcium chloride is a desiccant that works through absorption. It has a high affinity for water and can form hydrates when it comes into contact with moisture. This process effectively removes water from the air, keeping the container environment dry.

The Role of Container Desiccants in Preventing Corrosion

Maintaining Optimal Humidity Levels

The primary role of container desiccants is to maintain a low relative humidity inside the container. Most metals start to corrode when the relative humidity exceeds 60%. By using the right type and amount of desiccant, we can keep the humidity below this critical level. For instance, in a long – haul ocean shipment where the container is exposed to high humidity for an extended period, a powerful desiccant like calcium chloride can absorb large amounts of moisture, ensuring that the humidity remains within the safe range.

Protecting Metal Surfaces

Container desiccants create a protective barrier against moisture for metal surfaces. When the air inside the container is dry, the metal components of the cargo and the container itself are less likely to come into contact with water. This reduces the risk of oxidation and rust formation. For metal products with a high surface – area – to – volume ratio, such as wires and sheets, desiccants are especially crucial. They prevent the formation of thin water films on the metal surfaces, which are the precursors to corrosion.

Preventing Condensation

Condensation is a major culprit in container corrosion. As the temperature inside the container fluctuates, warm, moist air can cool and condense on cold surfaces. Container desiccants help to prevent this by reducing the amount of moisture in the air. When there is less moisture available, the likelihood of condensation forming is significantly reduced. This is particularly important during night – time temperature drops or when the container moves from a warm to a cold climate.

Different Types of Container Desiccants and Their Applications

There are several types of container desiccants available in the market, each with its own unique properties and applications.

Silica Gel

Silica gel is a popular choice for container desiccation. It is a non – toxic, odorless, and chemically stable desiccant. Silica gel has a high adsorption capacity, especially at low to moderate humidity levels. It is often used in containers shipping sensitive electronics and food products. The advantage of silica gel is that it can be regenerated by heating, which makes it a cost – effective and environmentally friendly option.

Calcium Chloride

Calcium chloride is a highly effective desiccant, particularly at high humidity levels. It can absorb up to several times its own weight in water. Calcium chloride is commonly used in long – distance and high – humidity shipments, such as those across the ocean or through tropical regions. It is often packaged in breathable bags or sachets and hung inside the container to maximize its moisture – absorbing efficiency.

Montmorillonite Clay

Montmorillonite clay is a natural desiccant that is derived from clay minerals. It has a good adsorption capacity and is relatively inexpensive. Montmorillonite clay is suitable for general – purpose container desiccation, especially for low – value or less – sensitive cargo. It is also environmentally friendly and can be disposed of easily.

Case Studies: The Impact of Container Desiccants on Corrosion Prevention

Let’s take a look at some real – world examples of how container desiccants have helped prevent corrosion. A machinery manufacturer was experiencing significant corrosion issues with their products during overseas shipments. The metal parts of the machinery were rusting, which led to customer complaints and costly returns. After implementing a container desiccant solution using calcium chloride, the corrosion rate dropped significantly. The desiccants were able to keep the humidity inside the containers below the critical level, preventing the formation of rust on the metal components.

Another example is an electronics company that was shipping circuit boards in containers. The circuit boards were sensitive to moisture and corrosion. By using silica gel desiccants, they were able to protect the circuit boards from moisture damage. The silica gel adsorbed the moisture in the air, ensuring that the relative humidity inside the container remained at an optimal level for the safe transportation of the electronics.

Choosing the Right Container Desiccant

Selecting the appropriate container desiccant depends on several factors, including the type of cargo, the shipping route, and the duration of the journey.

For high – value and moisture – sensitive cargo, such as electronics and precision instruments, silica gel or high – performance desiccants may be the best choice. These desiccants can provide a high level of moisture protection and ensure the integrity of the products during transit.

If the shipment is going through a region with high humidity or a long – haul ocean voyage, calcium chloride desiccants are recommended. Their high absorption capacity can handle large amounts of moisture and keep the container environment dry for an extended period.

For general – purpose shipments or low – value cargo, montmorillonite clay desiccants can be a cost – effective option. They offer a reasonable level of moisture protection at a lower cost.

Conclusion

In conclusion, container desiccants play a vital role in preventing corrosion in containers. They are an essential tool for safeguarding your cargo during transit, especially when dealing with metal products or moisture – sensitive items. By maintaining optimal humidity levels, protecting metal surfaces, and preventing condensation, container desiccants can significantly reduce the risk of corrosion and ensure that your products arrive at their destination in pristine condition.

Ethylene Absorbers As a container desiccant supplier, I am committed to providing high – quality desiccants that meet your specific needs. Whether you are shipping across the country or around the world, our desiccants can help you protect your valuable cargo from the damaging effects of corrosion. If you are interested in learning more about our container desiccant products or have any questions regarding corrosion prevention, please feel free to contact us for further discussion and potential procurement opportunities.

References

ASTM International. (2019). Standard Practice for Protecting Metals from Atmospheric Corrosion during Storage, Shipping, and Displays. ASTM G141 – 19.
International Maritime Organization. (2018). International Maritime Solid Bulk Cargoes (IMSBC) Code. IMO.
Singh, R. P., & Choudhury, A. (2017). Handbook of Barrier Coatings for Corrosion Protection. CRC Press.

Shenzhen Chunwang New Materials Co., Ltd.
Established in 1998, Shenzhen Chunwang New Materials Co., Ltd. is well-known as one of the leading manufacturers and suppliers of container desiccant in China. During the past two years, we have introduced advanced equipment and technology into our factory. Please be free to buy our cheap container desiccant made in China.
Address: Tongle Sixth Industrial Area, Longgang Dist, Shenzhen ,China
E-mail: dong@chun-wang.com
WebSite: https://www.absorbwell.com/