Stand alone system without topcoats to replace hot-dip galvanising or hot metal spray
Zinga is used in a wide variety of applications which can be basically divided into the following:
As a repair for worn or damaged hot-dip galvanising or hot metal spray
This is probably the most common use of Zinga as it requires the simplest surface preparation. Zinga’s mechanism of protection is so similar to conventional galvanising that they work in complete unison – after all they are merely different forms of zinc. Rather than replace galvanised assets, structures can simple have their protection “re-charged” by applying Zinga to the rough surface of the old galvanising after appropriate decontamination.
As a stand alone system without topcoats to replace hot-dip galvanising or hot metal spray
Zinga provides comparable protection to conventional galvanising without the need for topcoats. Although Zinga is only available in grey the significant advantage of this form of application is that the Zinga layer can be re-coated at any point in the future with the bare minimum of preparation without compromising the integrity of the coating (see Re-Liquidising of Zinga). Zinga on its own is often used when specifiers are unable to galvanise because the structure is already in situ or too big for the molten zinc baths. Additionally Zinga is commonly specified on delicate structures (wrought iron gates, sculptures etc.) or when architectural demands require a higher standard of surface finish (no need to drill to de-gas, fettle etc.).
As a primer with suitable topcoats
Not everybody likes the colour grey and with the additional protection of a compatible topcoat the coating durability offered is significantly increased. The Zinga does not even have to start actively working until the topcoat has been compromised and with no underlying corrosion creep or rust bubbling the topcoat itself inevitably lasts longer (see Duplex Systems for more detail).
As protection to concrete reinforcement bars (rebars)
Widely used in countries where the available aggregate for concrete can be saline (e.g. Iran , India, Saudi Arabia etc.), Zinganising the steel re-bars before assembly and immersion in concrete ensures vastly increased protection from corrosion without reducing the pull-out strength of the bars. Recent tests in three independent laboratories showed that Zinga had at least twice the corrosion protection of either galvanised or epoxy coated rebars. Please click here to read about this aspect of Zinga usage in greater detail (please note this is a comprehensive document and may take some time to download) or here for specific lab reports on the subject.