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5.3 Check points at Intermediate Service
5 Service Instructions
52
Stainless steel
Stainless steel parts corrode when in contact with
either chlorides or acidic solutions. Acidic
solutions cause a general corrosion. The chloride
corrosion is characterised by local damage such
as pitting, grooves or cracks. The risk of chloride
corrosion is higher if the surface is
•
exposed to a stationary solution,
•
in a crevice,
•
covered by deposits,
•
exposed to a solution that has a low pH
value.
A corrosion damage caused by chlorides on
stainless steel begins as small dark spots that
can be difficult to detect.
•
Inspect closely for all types of damage by
corrosion and record these observations
carefully.
•
Polish dark-coloured spots and other
corrosion marks with a fine grain emery cloth.
This may 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.
DANGER
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.
Replace the part if corrosion can be
suspected of affecting its strength or
function.
S
0
02
06
1
1
Example of chloride corrosion in stainless steel
S
0
02
05
1
1
Polish corrosion marks to prevent further damage
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