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5
Service instructions
5.3
Check points at Intermediate Service
Stainless steel
Stainless steel parts corrode when in contact
with either chlorides or acidic solutions. Acidic
solutions cause general corrosion. The chloride
corrosion is characterized by local damage
such as pitting, grooves or cracks. The risk of
chloride corrosion is higher if the surface is:
Example of chloride corrosion in stainless steel
•
Exposed to a stationary solution.
•
In a crevice.
•
Covered by deposits.
•
Exposed to a solution that has a low pH.
Corrosion damage caused by chlorides on
stainless steel begins as small dark spots that
can be difficult to detect.
1.
Inspect closely for all types of damage by
corrosion and record these observations
carefully.
2.
Polish dark-coloured spots and other corrosion
marks with a fine grain emery cloth. This may
prevent further damage.
!
WARN
ING
Disintegration hazard
Pits and spots forming a line may indicate cracks
beneath the surface.
All forms of cracks are a potential danger and are
totally unacceptable.
Renew the part if corrosion can be suspected of
affecting its strength or function.
Polish corrosion marks to prevent further damage
Other metal parts
Separator parts made of materials other than
steel, such as brass or other copper alloys, can
also be damaged by corrosion when exposed to
an aggressive environment. Possible corrosion
damage can be in the form of pits and/or cracks.
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