PS Magazine - TB 43-PS-693
PS, The Preventative Maintenance Monthly
ISSUE 693
AUGUST 2010
28
PS 693
AUG 10
29
PS 693
AUG 10
UNIFORM (or general attack):
Affects a large area of exposed metal surface, like rust on steel or tarnish on silver. It
gradually reduces the thickness of the metal until it fails.
9
Types of Corrosion
CREVICE:
Occurs in crevices created by rubber seals, gaskets, bolt heads, lap joints, dirt or other
surface deposits. It will develop anywhere moisture or other corrosive agents are
trapped and unable to drain or evaporate.
SELECTIVE LEACHING:
One element, usually the anodic element of an alloy, corrodes away, leaving the
cathodic element. This can create holes in metal.
INTERGRANULAR:
Metal deterioration caused by corrosion of the bonds between or across the grain
boundaries of a metal. The metal will appear to be peeling off in sheets, flaking, or being
pushed apart by layers. A particular type of intergranular corrosion is exfoliation.
With this
knowledge,
you can catch
and cut
corrosion
before
it
gets out of
hand.
it’s definitely
better to find out
about corrosion
in less stressful
circumstances.
Once you know the kind
of corrosion you’re
dealing with, it’s much
easier to defeat it!
a short time
later…
SERGEANT DROHEN!
I’ve uploaded
the info to your
system. do you
see
it?
roger
that,
connie!
inter-
granular
metal deterioration caused by
coRosion of the bonds betwEn
or acroS the grain boundar
ies
of a metal. the metal wiL.
.
erosion
results when a moving fluid
or gas flows acroS a m
etal,
particularly when solid part-
icles are present in the fluid.
galvanic
oCurs wen two
diFerent kinds
of metal come in contact with
each other, like stEl bolts on
aluminum, for example.
inter-
granular
metal deterioration caused by
coRosion of the bonds betwEn
or acroS the grain boundaries
of a metal. the metal wiL.
.
erosion
results when a moving fluid
or gas flows acroS a metal,
particularly when solid part-
icles are present in the fluid.
galvanic
oCurs wen two diFerent kinds
of metal come in contact with
each other, like stEl bolts on
aluminum, for example.
693.28-29.indd
1-2
7/9/10
11:43:10 AM
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