Washing and Passivation

CORROSION

Stainless iron features excellent anticorrosive properties towards most of the fluids used in the food and pharmaceutical industries: this is due to the self-passivating layer that naturally covers stainless iron.
However, machining like cutting and welding, which are performed during plant manufacturing, create discontinuities in the chromium oxide protective layer, which naturally enwraps the material, in such a way making the material more vulnerable to corrosion effects. This is the reason why the plants must undergo washing and passivation cycles.

ROUGE

“Rouge” is a well know phenomenon in the pharmaceutical industry, which uses ultra pure high temperature waters. The main components of “rouge” are iron oxides, which form a colour layer that can vary from reddish to dark black and in the course of time gradually cover the internal walls of the plants. The plants must regularly undergo a specific cleaning procedure called “derouging”.

WASHING, PASSIVATION AND DEROUGING

Idroinox Impianti gained multiannual experience in washing, passivation and derouging.
We perform these activities with specific products for pharmaceutical plants, each previously tested by hundreds of washing, passivation and derouging testing performed in the most reliable pharmaceutical multinationals.
The substances and the procedures involved in the passivation processes are certified according to the ASTM 380 – 967 USA standards, easy to neutralize and dispose, and not-aggressive towards pipes.

CHECK

The passivation check is made by measuring the corrosion potential residual of the pipes with apposite testers and procedures. This process takes places in accordance with the USA FEDERAL CODE.