Home Blog Did you know that... rouging can form in your purified cold water supply networks?

 

| September 2019

Did you know that... rouging can form in your purified cold water supply networks?

Did you know that... rouging can form in your purified cold water supply networks?

Rouging is basically like the superficial oxidation of stainless steel equipment. This corrosive phenomenon, which isn’t very well defined in scientific literature, looks like a double-diffusion chemical phenomenon. Oxygen in the environment penetrates the material and oxidises the iron and metallic chrome. Iron diffuses out from the core of the material to the surface, where it is oxidised and forms an external layer rich in iron oxides. 

This phenomenon begins with contact from high purity liquid at a high temperature. In the pharmaceutical industry, rouging only happens, according to the literature, in contact with water for injection (WFI) or pure steam (PS). 

In practice, cold ozone purified water networks also experience colouring after a few months of use. The ultra-oxidising nature of ozone (O3) forms oxides on the surface. Although physically different, this layer is chemically comparable to the one produced by rouging. So issues arising from the risk of particulate release or the notion of the cleanliness of surfaces apply directly in this case. Moreover, the risk of the development of bacteria becomes a reality, as the new oxides that are formed increase the roughness of the surface on the one hand, and on the other, they are porous, which means that bacteria are more likely to stick.

A derouging or deoxidation process can therefore be considered to restore the surface of affected equipment to their original state. 

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