GEOMET® is a proprietary water-based coating dispersion containing metal oxides, metallic zinc and aluminum flakes. Multiple layers of zinc and aluminum platelets align forming a metallic gray-silver coating. Geomat coating applied as a liquid, becomes totally inorganic after curing at 575-600° F (300- 315°C)
Dip-Spin – Dip-Spin application methods are used for coating small parts. Bhalla Fasteners which is the leading manufacturer, supplier and exporter of geomat coated fasteners has geomat testing laboratories inc in which fasteners are loaded into a perforated metal basket and immersed into the GEOMET coating. On lifting the basket excess coating are spun-off the parts.
GEOMET coating was first employed in 1998, by automotive manufacturers across Japan, United States and Europe. Well established brands like Toyota, Honda, Nissan, Ford, GM, VW, BMW, FIAT, are using this coating for corrosion protection.
GEOMET has applications not only in automotive industry but in wind power, rail, electrical, public works and many industries including fasteners industry.
Environmental awareness across the globe in past years and with increasingly stringent laws are being enacted in order to regulate toxic substances certain coatings like the use of hexavalent chromium, which was widely used as effective coating for prevention of rust - is likely to be regulated and phased out under the new environmental regulation, especially those being adopted in US and Europe.
Among this geo met was born as a new chromium free coating technology.
GEOMET coating minimizes rusting of fasteners and also enhances aesthetic beauty. Bhalla Fasteners uses geomet 360 as high performance thin layer anti-corrosion systems as geomet coating is chrome free and is well suited for protecting both large and small parts with simple or complex geometry
Bhalla Fasteners has various geo met coatings
GEOMET 720 is applied to protect fasteners and othertypes of metallic parts from corrosion and is used in many industries. In Asia it is the reference zinc flake coating.
Characteristics and performances
GEOMET® 321 is applied to protect fasteners and many type of metallic parts from corrosion and is used in many industries. It can be combined with PLUS®, DACROLUB® or GEOKOTE® layers to provide a very broad range of friction coefficients. It is the most widely used product in zinc flake technology.
GEOMET® 360 is formulated to protect brake discs against corrosion. The brake disc surface can be totally thin layer coating, still providing high performances without any influence on braking characteristics. GEOMET® 360 is obtained from a water-based dispersion of zinc and aluminium flakes. The color of the coating is silver Characteristics and performance*
GEOMET® 500 is applied to fasteners and many type of metallic parts to protect from corrosion, and it is used in many industries
Characteristics and performance
1. Non polluting, environmentally responsible coating
a) Water based chemical solution
b) Completely chromium free solution
c) Closed system coating process
2. Outstanding resistance to the salt spray test and cyclic corrosion test
GEOMET® coating when put through its paces in the salt spray test and cyclic corrosion test provides a very high degree of corrosion resistance.
3. Superb resistance to high temperature heat and corrosion
GEOMET® coating withstands high temperatures for an extended period of time as it contains no crystalline waters or resins that can easily deteriorate under heat. With electro galvanized coating (colored chromate coating), the surface chromated film will fail at approximately 100ºC, where upon the surface properties will after and corrosion resistance will plummet.
4. Superior prevention of galvanic corrosion of aluminium parts
Galvanic corrosion is when a metal or alloy of a given corrosion potential contacts another metal or alloy having a different corrosion potential. It is also anticipated in conditions where an aluminium material contacts a galvanized part or a GEOMET® coated part. The corrosion potential of zinc (the material used in the process of galvanization) is lower than that of aluminum, so electrolytic corrosion with aluminium will be prevented for the time when the sacrificing anti corrosion effect of the zinc coating is maintained. Once the zinc metal is consumed and the base iron material is exposed, galvanic corrosion will occur between the iron and the aluminium. GEOMET® coating effectively suppresses the consumption of zinc metal, due in part to the fact that its corrosion potential which is close to that of aluminium, and partly due to its controlled sacrificing protection effect over zinc. Hence geomet , provides lasting protection against galvanic corrosion with aluminium. When stainless steel is coated with GEOMET, the corrosion potential of the stainless surface can be reduced, thereby preventing the pitting corrosion that can otherwise occur through contact with aluminium.
5. Excellent coating properties
GEOMET® provides superior rust proof performance on the inner surfaces of pipes which can be hardly reached by galvanizing.
6. No concern for hydrogen embrittlement
The absence of hydrogen embrittlement in the application of GEOMET® has been confirmed by the delta gauge method, which measures the extrusion distance before fracturing occurs.
7. Applicable over various metals
GEOMET® coated can be applied over a a wide range of materials, from iron and cast iron to stainless steel, aluminum and sintered metals.
8. Overcoat can be applied on GEOMET® coating
The overcoat compatibility of GEOMET® coating with solvent type was verified with melamine alkyd resin baking and powder coating.