FAQ - FREQUENTLY ASKED QUESTIONS

What is corrosion?

Corrosion is a chemical or electrochemical reaction between a material (usually a metal) and its environment that causes deterioration of the material and its properties. Typically, corrosion involves the oxidation of metals in the presence of water or steam and then takes the form of rust.

How can corrosion be prevented?

There are many ways to prevent corrosion, including modifying atmospheric conditions through drying, nitrogen protection, draining, etc., and creating a barrier on the surface of the metal to prevent moisture penetration. This barrier can be created through a liquid coating, such as oil, or through proper packaging of products that contain VCIs (Vapor Corrosion Inhibitors). Volatile corrosion inhibitors escape from the surface of the carrier (e.g. packaging film or paper) and are deposited on the metal surface. In this way, they form a corrosion-preventing inhibitor layer that inhibits the electro-chemical reactions that cause corrosion. Our company combines the use of volatile corrosion inhibitors with materials science and process management expertise to implement customized or supply chain solutions. We call this Zerust®/Excor® Integrated Corrosion Technologies (ICT).

What is the best way to store Zerust®/Excor® products before use?

During storage, we recommend that Zerust®/Excor® products be kept out of direct sunlight and away from water. Products should be stored in the original packaging (carton, bag, container) in which they were shipped. If the packaging in which the product was shipped is damaged, cover the product with a polyethylene sheet or bag to protect it from dust and dirt. Zerust®/Excor® products should be stored at a moderate temperature, typical of indoor conditions. This will minimize the risk of exposure to excessive heat, direct sunlight and adverse weather conditions such as rain or snow.

How do Zerust®/Excor® packaging materials work?

Zerust®/Excor® packaging materials contain VCI molecules that, when present on the metal surface, inhibit corrosion by forming a physical, hydrophobic layer that prevents direct contact between water and moisture and the metal. Because VCI molecules are carried by air, they must be collected close to the metal surface using a bag or other packaging. When metal components are in an environment where they are subject to corrosion or during long-term storage, products containing volatile corrosion inhibitors (VCIs) provide comprehensive rust protection.

Can Zerust®/Excor® bags and pouches be used to store parts that have been previously treated with oil?

A part coated with a thin layer of oil can be stored in Zerust®/Excor® bags and pouches. However, a thick layer of oil may prevent volatile corrosion inhibitors from settling on the metal surface and forming an anti-corrosion layer. To determine if oil can be used in your case and what the appropriate amount of oil should be, please contact our staff.

After how long after a component is placed in Zerust®/Excor® packaging materials, do the volatile corrosion inhibitors activate and begin to protect the metal part?

The time it takes for the active corrosion inhibiting molecules to fill the package depends on the volume and temperature of the package. Metal protection begins as soon as the volatile corrosion inhibitors (VCIs) settle on exposed metal surfaces. Maximum protection is provided when the entire volume of the package is saturated with VCIs.

Do Zerust®/Excor® packaging materials adversely affect electrical or electronic components?

Test results show that Zerust®/Excor® products do not adversely affect electrical or electronic components. In contrast, VCI molecules help improve the reliability of electrical and electronic components by preventing corrosion that is too small to see with the naked eye. Zerust®/Excor® packaging products can be safely used for corrosion protection of tools, jigs, fixtures, and equipment that contain electrical or electronic components.

What is a VCI film?

Our company uses VCI technology to inhibit metal corrosion. VCI film is a package that consists of polyethylene film impregnated with chemical compounds unique to each manufacturer. While the composition of individual chemical formulations may vary, the final product has similar functions, in that very low concentrations of invisible volatile corrosion inhibitors are released into the surrounding air. The volatile molecules gradually condense on exposed metal surfaces and form a molecular shield against corrosion, protecting against rust and other forms of corrosion for up to five years, and in some cases even longer. When the VCI packaging is later removed, all of the volatile molecules quickly volatilize. This keeps metal parts clean and ready for use.

Does Excor sp. z o.o. meet ISO standards?

Yes, Excor sp. z o.o. meets the requirements of ISO 9001:2008 Management System, which includes the production and sale of packaging and the sale of VCI anti-corrosion systems.

Can Zerust®/Excor® bags be reused?

Yes, if the Zerust®/Excor® bags are still in good condition with no holes or tears. Those ZERUST®/EXCOR® bags that have a large number of holes and tears, have begun to crack or have noticeably lost their properties as a result of exposure to sunlight will not provide adequate corrosion protection and should not be reused.

Are Zerust®/Excor® products safe for the environment?

We make sure that the corrosion preventatives we produce are not only effective, but also safe for users and the environment. Most Zerust®/Excor® products are biodegradable and recyclable. Our products help to reduce the environmental impact of industry by extending the life of the material. This reduces the energy required to produce new metal parts and the amount of waste generated in the process. Zerust®/Excor® products are safe for humans and the environment according to the criteria of the EU CLP (Classification, Labelling and Packaging) Regulation No. 1272/2008 and the standards of the Global Harmonized System of Classification and Labelling of Chemicals. Zerust®/Excor® products in original sealed packaging are not considered hazardous materials under CFR (Code of Federal Regulations) criteria - they are not flammable, corrosive, reactive or toxic.

What can you expect if you put already rusted parts in Zerust®/Excor® packaging?

When rusted parts are placed in Zerust®/Excor® packages, the corrosion process will be slowed down. However, the packages will not remove the rust on the parts. To remove rust and corrosion build-up from the metal surface, use Axxaclean 2048 rust remover. This is an excellent product to restore the metal to its original condition.

How to use ActivPak® emitters (LS)?

First, determine the appropriate number of ActivPak bags needed to provide corrosion protection in a given space. Be careful not to use too many bags. Remove the ActivPak from the plastic bag, taking care not to puncture the bag. Place the bag as close as possible to the center of the area to be treated. If you use more than one ActivPak you should place them evenly. Finally, make sure that the package or the closed space in which the bags are placed is tight, so that the volatile corrosion inhibitors accumulate inside. Remember: ActivPak bags can be in direct contact with ferrous metals. However, they must not touch brass, copper and zinc.

How to use Zerust® Axxanol™ 33 oil?

Make sure the parts are clean and dry before applying the Axxanol 33 oil. Wear gloves when applying the oil to avoid leaving fingerprints on the parts to be protected. Apply the oil in a well-ventilated room. Spray, spread, brush or dip metal parts in Axxanol 33. Remember to wear a protective mask or an oxygen mask during application. For additional protection of metal parts, you can use other Zerust®/Excor® products. For transportation and storage, keep protected parts in a sealed container. For more information on the oils in our range, visit products-vci.co.uk.