Wednesday, August 29, 2018

The Myth of Corrosion

Chlorine dioxide (CD) is an oxidizer, as is hydrogen peroxide, ozone, bleach, and many other decontaminating agents. However, CD gas is the gentlest on materials among those options, due to its lower oxidation potential. A higher oxidation potential means it is a stronger oxidizer and more corrosive. As shown in Table 1, chlorine dioxide has an oxidation potential of 0.95V, which is lower than other commonly used oxidizing biocides. CD is not as aggressive an oxidizer (oxidation potential data) as chlorine, ozone, peracetic acid, peroxide, or bleach — and it should be non-corrosive to common materials of construction.

Table 1: Oxidation Potential of Common Biocides

While scientifically less corrosive, chlorine dioxide gas has a bad reputation due to the link with chlorine as well as the other chlorine dioxide products that lack the purity that our process uses. Other methods of generating chlorine dioxide mix an acid and a base which forms a chlorine dioxide solution which is then off-gassed to fumigate a space.  That generation method produces two acidic components, acidified sodium chlorite and chlorous acid, alongside chlorine dioxide which makes these methods more corrosive. Our method of generating pure chlorine dioxide gas is accomplished by passing a low concentration chlorine gas through a proprietary sodium chlorite cartridge to convert the chlorine gas into pure chlorine dioxide gas. This allows our process to be safe when decontaminating stainless steel, galvanized metals, anodized aluminum, epoxy surfaces, electronics, and the most common materials of construction. Typically, if water will not corrode an item, neither will our CD.

To learn more about material compatibility, click here. If you have a specific item of concern, send us some samples. We offer free material testing* to give confidence that chlorine dioxide gas will be safe on your equipment, products, components, tools, etc.

*Testing is free for small items or batches. For large items or extended testing, please call (908) 236-4100. Shipping not included.

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