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 download the product sheet
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GEOMET® 720
GEOMET® 720 is a non-electrolytically applied thin-film coating of metallic grey colour for the corrosion protection of parts made from steel, cast iron, or other iron metals.
GEOMET® 720 is composed of zinc and aluminium flakes in an inorganic binder; it has been developed by NDS, the producer of DACROMET® 380, as the chromium-free alternative.
The GEOMET® 720 coating is obtained by the application of an aqueous dispersion by cold immersion or spray and is therefore free of any risk of hydrogen embrittlement. |
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CHARACTERISTICS
GEOMET® 720 is a sacrificial coating. Its corrosion resistance depends upon the thickness of the coating and is due to the combination of several mechanisms:
· barrier effect due to the tile-like structure of the film,
· controlled sacrificial protection of the zinc in relation to the metal substrate,
· the integral film passivation, which reduces the speed at which the zinc and aluminium are con-sumed.
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COATING THICKNESS
(Base Coat) GEOMET® 720 > 20 g/m² > 1000 Hrs. (Salt spray test)
(Base Coat) GEOMET® 720 > 20 g/m² (Topcoat) PLUS® >3g/m2 > 1500 Hrs. (Salt spray test)
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APPLICATION FIELD
GEOMET® 720 must be used according to the specifications of automotive and truck industry (e.g.Toyota, Nissan...). In industries with no specific standard, the ISO 10683 and ISO 13858 can be used. The standards describe requirements for zinc-flake coatings. Related information can be found at www.dacral.com and www.n-d-s.co.jp.
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HOMOLOGATIONS
GEOMET® 720 is a chromium free corrosion protective coating made from water-based chemicals free of harmful substance. It meets the requirements of the European legislation on recycling, especially the directives 2000/53/EC and 2002/95/EC.The water-based dispersion used to obtain the coating helps to comply with the current legislation on gas emissions.
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