Posted by Gordon England (62.252.0.12) on 16:10:36 04/05/05
In Reply to: need a comparison between posted by Omry Karplus
Galvanising and thermal spray zinc coatings are very similar in that they both provide very effective galvanic protection to iron and steel substrates. they will protect small adjacent un-coated areas and work without forming a 100% complete barrier to the environment as needed with many other paint/coating systems.
The advantage with thermal spray zinc coatings:
1. Life of coating is primarily effected by coating thickness/mass. Thermal spray coatings can be applied thicker and so extend life.
2. Can be applied to objects not suitable for hot dipping, on-site structures, low temperature process (substrate)
3. Rough texture can be better for accepting additional paint finish.
Advantages of galvanising:
1. Thermal spray is a line of sight process, so galvanising may be better for parts with complex shapes and out of sight areas.
2. Galvanising produces metallurgical bond, is denser and has a smooth finish.
Probably more pros and cons could be added.
Regards Gordon
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