Metal industry: preventing corrosion on steel coils

The greatest threat during the transport of the rolls of strip steel and steel wire, known as coils, which sometimes lasts for weeks, is the formation of rust. Excessive humidity in the container, combined with fluctuating outside temperatures, can lead to a sharply rising corrosion curve.
Thematic image of the steel industry with lined-up steel coils

Challenge: leakage of drip systems and increasing risk of corrosion

A shipping company specializing in the transport of goods by inland waterway vessels had already addressed risk minimization for moisture damage. Those responsible initially decided to use desiccant in the form of a drip system. As the name suggests, a liquid is produced during dehumidification. This liquid, in the form of brine, leaked during one of our customer’s transports and created optimal conditions for the formation of rust on the metal coils.

Close-up of rust on metal
Corrosion on metal coils

Solution: Leak-proof moisture binding with SeaDry

The SeaDry container desiccant developed by ThoMar, on the other hand, consists of a salt-binder mixture. In addition to calcium chloride, starch is added to the desiccant bags to bind the water. The salt absorbs moisture from the ambient air, and the starch ensures that the resulting liquid is bound into a gel. This prevents water from leaking out, and the saturated desiccants can be easily disposed of.
For a test, the customer received precise instructions on how to use SeaDry together with data loggers and how to evaluate them after arrival. The relative water absorption capacity of SeaDry is ≥ 250% under real conditions over more than 60 days and ≥ 300% under extreme conditions – significantly more than the approximately 125% of pure drip systems. This makes SeaDry not only safer but also more economical to use.

Result: Effective corrosion protection and economic advantage

The use of SeaDry led to a significant improvement in moisture control within the container. No leaks occurred, the humidity remained stable, and the steel coils reached the recipient free of new rust. The combination of higher absorption capacity and leak-proof gel binding offers the customer a double advantage: maximized product safety with simultaneously lower usage and costs.

Product image ThoMar Data Logger 10TH for measuring temperature and relative humidity, detail with temperature
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Data Logger 10TH for Temperature and Humidity

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Product image ThoMar SeaDry Pole V vertical container desiccant application in the container
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SeaDry Pole V vertical container desiccant, with protective box

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Product image ThoMar SeaDry Pole H horizontal container desiccant application in the container
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SeaDry Pole H horizontal container desiccant, with protective box

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