Galvanic corrosion protection

In high-voltage substations, many components are made of hot-dip galvanized steel: this technology coats the steel with hot zinc, which cools to form a cathodic anti-corrosion layer. HV gantries, retention tanks, fire extinguishing covers and fire suffocating gratings, electrical towers and pylons, transformer radiators and many other metal structures are hot-dip galvanized from the factory in molten galva baths.


As the zinc layer ages, it disappears. Hot-dip galvanizing protects your metal parts from rust for several decades under the oxidizing and aggressive conditions of the “standard” environment. According to ISO 1461-2022 and ISO 9223, “standard” outdoor industrial activities are considered to be C3 or C4 corrosion environments: normal industrial, urban or maritime environments with low salinity.


When the corrosion class approaches C5, in outdoor environments with high industrial pollution or salinity, hot-dip galvanizing degrades extremely rapidly, reducing the corrosion resistance of hot-dip galvanizing from several decades to just a few years (C5, C5H, CX, C5HV, etc.).


GALVAGRID RUST ANODE PRIMAIRE technology combines a revolutionary galvanic coating with a unique operating procedure that not only provides your new galvanizations with an additional zinc thickness greater than that of hot-dip galvanizing, but also enables you to recharge oxidizing metal structures in situ, giving them a second life for the next 20 to 40 years without having to change the structures: this is known as room-temperature galvanizing, either in the factory or on site.


GALVAGRID RUST ANODE PRIMAIRE is the result of a unique development with NATO since the 1960s, and has been available to the civilian market for some years now. This unique technology benefits from over 50 years’ experience and is distributed exclusively by SYNERDIS® in Europe for the electrical industry.

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