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Letter 31047
Surface pitting of painted steel parts
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Some carbon steel parts that we paint exhibit pits on the surface
immediately after painting and drying. We are not sure if the pits
(1/16" long, 0.002" to 0.004" deep) are initially in the steel(they
are not visible on the parts prior to painting); or if they are being
created during the treatment & painting process (iron phos coated
and paint). We have been investigating original pitting on the steel
surface without finding a cause, but now we think that it may be
caused in the paint process. Is it possible that these pits could be
caused during the pretreatment and paint process? What should we be
looking at in this process to understand? Does anyone have experience
with pitting during the treatment & paint process?
D. Klesser
Manufacturer - Pittsburgh, PA, USA
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