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Swimming
Pool Corrosion Staining
Corrosion staining from swimming pool ladder poles
was observed on the concrete decking supporting the
ladder poles. An overall view of the staining is
shown in Photograph A
Photograph A:
Overall view of concrete pool ladder support.
The swimming pool ladder poles were removable and
were set into a cup receiver as shown in Photograph
B.
Photograph B:
Close-up view of receiving cup that was ladder pole
receptacle. Note corrosion on inside surface of
receiving cup.
The poles were chemically analyzed and were found to
be type 304L as prescribed in the construction
specifications. The bottom of the pole receiving
cups, shown in Photograph B, were solid without
drainage capability. Thus, chlorinated pool water,
which washed into the receiver cups, would remain
and concentrate. The bottom of the ladder poles
would thus be subjected to concentration cell
corrosion and pitting attack by chloride in the
swimming pool water+.
The rusty corrosion product and concentrated
chloride pool water was forced up and around the
receiver cup lip and stained the concrete decking.
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Dr.
R. Craig Jerner, Ph.D., PE specializes in accident
investigation and metallurgical failure analysis,
with over 30 years experience as a metallurgical
consultant and accident investigator. He has
testified as a metallurgical expert in over 250
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