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the occurrence of protective cover layers is prevented. Instead, so-called "white
rust" forms on the surface of galvanised parts.
White rust consists mainly of zinc hydroxide and slight proportions of zinc oxide and
zinc carbonate. In practice white rust can only become a problem with freshly hot-
dipped galvanised parts. The formation of white rust has no connection with the
galvanising process and is not a measure for the quality of the galvanisation. The
probability for possible white rust formation fluctuates depending on the weather in
the course of a year. White rust occurs more frequently in autumn and winter.
Frequent precipitation in the form of rain and snow, fog and dropping below the
dew point due to low temperatures promotes possible white rust formation.
Aggressive liquids, for example salts, brake fluids, chemical additives or acids have
a negative effect on the zinc layer. If they come in contact with the zinc galvanised
surface they must be removed immediately and the area cleaned (see the chapter
Cleaning and Care)
Touch-up after incidence of white rust:
With only a slight incidence, the removal of white rust is not absolutely
-
necessary.
With a strong incidence, smaller areas can be removed with a special brush
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(e.g. made of soft bronze wire, brass or a plastic brush). Be careful, if brushed
too intensively the surface can become dark.
If necessary, zinc and stainless steel cleaner (e.g. Leraclen ZNR) can be used.
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Traces of usage due to tyre wear
Traces of usage due to tyre wear result in an unattractive surface on the drive rail.
These have nothing to do with the quality of the galvanising. (see point Cleaning
and Care)
Spotting due to spilling liquids
See chapter Cleaning and Care
Cleaning and care
Regularly clean the galvanised parts (and immediately after contact with
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aggressive substances) with plenty of clean water.
If necessary the surface must be brushed off with a special brush and with slight
-
pressure
Let the surface dry well!
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The drive rail must be free during this, there must be no vehicle on the lift.
Seal the surface with a temporary corrosion protection against recurrence of
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the white rust. For this use acid-free oils, greases or waxes.
UNI LIFT 6500 - 8000
Operating instruction and documentation
- 53 -
UNI-LIFT 6500 - 8000
Version 4.2
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