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The colour the coating is
determined varying the process duration and type, well the layer
thickness.19: Typical colour variations
Housings made aluminium alloys can protected from corrosion by
chrome plating.4 Yellow Chrome-plating
Fig.2. The type seal chosen based the required degree of
protection (refer Sections 2. The chrome layer consists chrome compound created
with chrome containing acidic alkaline solutions. disadvantage this kind coating that
the colour varies considerably; yellow chrome layers range from light yellow
to dark brown. This chrome finish frequently used for EMC housings, because
of its electrical conductivity.Hoods and Housings 33
3. Defined samples the seal material are inserted between two
polished steel plates and then compressed the dimension specified the
standard.
For housings deployed very rough environments, layer powder
coating applied over the chrome.4 and 3.3 Sealings
3. 3.1 Type seals
Connectors always consist two more parts and therefore must sealed
accordingly. This problem tolerated, because yellow chrome plating is
very inexpensive, and does not contain substances that are harmful health. The seal between the bulkhead mounted housing and the
mounting surface stressed only once, during installation (the two parts are
usually screwed together), and remains position afterwards.17 3.
Mating forces stress the seal between the upper and the lower bulkhead
mounted housing. applied by
immersion, spray-painting electrolytically.
After the seal has been exposed prolonged pressure stress, its elasticity is
tested.3.
3.2.
Different sealing levels are created, depending the housing combination. The user determines the test time and temperature, well the
.2).3.18 3. The so-called permanent set measured accordance with DIN
53517
