Passivation

In addition to iron, stainless steel alloys contain chromium, nickel, molybdenum, and other constituents. In combination with oxygen, chromium in particular forms a stable, chromium-oxide-rich layer that protects the system from rouge. This so-called passive layer can be strengthened by chemical passivation. To minimise the susceptibility of rouge from the start, new systems should therefore be professionally passivated after installation.

Efficient passivation in three steps

Our method for passivating stainless steel systems is a three-stage process that includes a pH-neutral pre-cleaning followed by passivation treatment and a final rinse. Throughout this process, the equipment is treated in a controlled recirculation system with chemicals that do not attack stainless steel pipes. Our specialised chemicals optimise the chromium-to-iron ratio of the surface, creating a more robust passive layer that significantly contributes to reducing susceptibility to corrosion.

Regularity is the key

Regular maintenance is essential for effective maintenance of the passive layer and long-lasting protection of your systems. Factors such as high temperatures, e.g. caused by welding, or mechanical damage to the surface can compromise the integrity of the passive layer. A result is the potential build-up of rouge, which makes renewed cleaning, derouging, and repassivation necessary. Periodic repassivation of the system is therefore essential for sustainable success in preventing rouge.

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