One of those scientific terms that you may be left wondering about. It is common jargon amongst Preservation Teams, but it may still be a little unclear. What does VCI stand for?
More importantly, why do we need VCI?
THE CORROSION INHIBITING PROCESS
What is a volatile corrosion inhibitor?
A volatile corrosion inhibitor (VCI) is a chemical substance that is added to the surface of a paper. Metal that is to be protected is covered with this paper, and these chemicals are slowly volatilized and release compounds within a sealed airspace that actively prevents surface corrosion of the metal (Corrosionpedia).
How do volatile corrosion inhibitors work?
A VCI’s vapour moves from the initial packaging in which it was contained and fills the entire volume within the storage system with a continuous chemical cloud. When the vapour concentration reaches a certain level, equilibrium is established (which works most effectively if the package is airtight), and crystals condense rapidly on the surface of the metal. VCI molecules attach themselves to metal surfaces to form an invisible, thin film only a few molecules thick. This layer of molecules passivates the charged surface and creates a barrier that prevents oxidation, thus halting corrosion (Corrosionpedia).
How does this technical information relate to Daywalk VCI Plastics and Papers?
Daywalk VCI Plastic provides outer protection from external elements such as rain or moisture. Therefore, the plastic is providing physical protection as well as chemical protection due to its VCI properties.
Daywalk also offers VCI Paper to complement the VCI Plastic. This extra layer protects the equipment or parts that are being packaged from drips of condensation that will potentially form on the inside of the outer plastic layer. Condensation forms when the temperature outside the area contained by the plastic cover is cooler than that of inside the cover. If this occurs, and a droplet forms on the plastic that is heavy enough to drop, the VCI Paper will protect the equipment or parts. The paper simply provides an extra layer of protection by preventing the droplet from contacting the equipment. As the paper will not hold condensation like the plastic does, the equipment is therefore protected.
Furthermore, Daywalk VCI Paper also emits the Volatile Corrosion Inhibitor which effectively adds to the layer of chemical protection on the equipment or spare parts in question.
Information in ‘What is a volatile corrosion inhibitor?’ and ‘How do volatile corrosion inhibitors work?’ sourced from Corrosionpedia,. “What Is A Volatile Corrosion Inhibitor? – Definition From Corrosionpedia”. N.p., 2016. Web. 2 Mar. 2016.
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