8.4.3 Cleaning aluminum parts
The surface of untreated aluminum is always covered by a thin but dense oxide skin. The
affinity
of aluminum to oxygen is sufficiently strong that if the oxide skin is scratched, the metal
reacts immediately with oxygen in the air. This forms a new oxide skin. This natural oxide layer
acts as surface protection and is the reason for the good weathering resistance of aluminum
materials. In most cases, this means that additional protective measures are superfluous.
Remove particularly greasy deposits with ethyl alcohol. If there are other heavily polluted areas,
use ESD-compliant fiber or plastic brushes to clean them.
NOTICE
Unsuitable cleaning chemicals for aluminum
Any
strongly alkaline chemicals such as caustic potash or soda as well as acids corrode the
aluminum and roughen the surface. The agents often recommended for cleaning glass also
exhibit this effect and must therefore not be used on aluminum.
Only use cleaning agents that are suitable for aluminum.
NOTICE
Unsuitable cleaning utensils for aluminum
The
use of unsuitable cleaning cloths and brushes may transfer metallic, corrosion-inducing
impurities onto the aluminum. This can result in corrosion damage.
● Use ESD-compliant brushes and cloths.
● Do not use cleaning cloths and brushes that have been treated with copper, brass, bronze
or other heavy metals.
● Use neither brass, bronze, or steel-wire brushes nor cloths or steel wool interwoven with
copper wire.
8.5 Repairs
WARNING
Insufficient cable insulation
Improperly laid or damaged cables and incorrectly attached cable shieldings can heat up in
places and cause fires or short-circuits wherever they make contact.
●
Check whether all the cable shields are intact.
● Insulate damaged cable shields.
● Make sure that a short-circuit cannot occur on the power cables due to failure of the
insulation as a result of incorrect cable installation.
Servicing
8.5 Repairs
Applications for Cabinet Modules, liquid cooled
Operating Instructions, 04/2015, A5E35974555A 119
Siemens Drives & PLCs
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