Protection against Corrosion

An absolute resistance to corrosion cannot be achieved technically. Therefore all of our products are equipped with a zinc alloy. This serves as means of protection in order to prevent deterioration of the device during its serviceable
life.

Due to aggressive influences of environment the zinc alloy wears off with time though. The speed in which this can occur can be influenced by various methods of zinc-coating.

Active cathodic protection against corrosion

Since zinc is less noble than iron in the electromechanical contact displacement series, the coating functions as anode and protects the less noble material - iron - in cathodic form until the zinc has been corroded off.

You can find the following versions in our catalogues:

Sendzimir zinc-coating (band zinc-coating) acc. DIN EN 10327 (formerly DIN EN 10147 and DIN 10142) middle value lamination strength app. 20 μm.
Interfaces are secured by means of the cathodic protection against corrosion up to a material thickness of 2 mm.
Hot-dip zinc-coated (piece zinc-coating) acc. DIN EN ISO 1461 middle value lamination strength app. 40-60 μm.
Interfaces must be zinc-coated as aftertreatment.
Galvanically zinc-coated (electrolytic zinc-coating acc. DIN EN 12329) Middle value lamination strength app. 2,5 - 10 μm.
V2A stainless steel material number 1.4301 or American Norm 304

Class	Inside	Outside	Corrosion Aggressiveness	Average Decomposition of Zinc Thickness / Year
C1	bheated rooms for example offices	-	inconsequential	< 0,1 μm/year
C2	unheated rooms for example warehouses	rural areas	little	0,1 bis 0,6 μm/year
C3	high humidity little to medium air pollution for example creameries, breweries	municipal and industrial areas with moderate pollution	moderate	0,6 bis 2,3 μm/year
C4	chemical plants, swimming pools	municipal and industrial areas with high pollution	strong	2,3 bis 4,5 μm/year
C5	rooms with strong and continuous condensation	shore and offshore areas	very strong	>4,5 bis 8,4 μm/year