Blisters
Blisters
(OP)
Hello guys,
This is an incinerator burner nozzle section.I can find a blisters at some location.What might be causing it? Is it because of painting?
This is an incinerator burner nozzle section.I can find a blisters at some location.What might be causing it? Is it because of painting?





RE: Blisters
TTFN
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RE: Blisters
Poor cleaning and surface preparation before painting.
RE: Blisters
RE: Blisters
Wrong paint and/or exceeding temp limits, or poor surface pres and/or curing.
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P.E. Metallurgy, Plymouth Tube
RE: Blisters
I was not able to pop them because it was at higher elevation.
So this is because of painting failure and not because of improper material selection/ material deterioration at high temperatures?
RE: Blisters
Not sure where you get that; at least two posts talked about wrong paint or overtemp
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RE: Blisters
Then you can decide if the correct coating was selected.
I am suspicious of the surface prep because of the location of the blisters, but if was the coater and you complained to me I would say that clearly you took it too hot.
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P.E. Metallurgy, Plymouth Tube
RE: Blisters
TTFN
I can do absolutely anything. I'm an expert!
homework forum: //www.engineering.com/AskForum/aff/32.aspx
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RE: Blisters
Is the paint a silicon-alkyd base high-temp paint?
These 'paint blisters' look as if they may have nucleated at/near weld-spatter sites that were incompletely ground-down and/or not 100% cleaned-off.
NO paint will adhere to a 'dirty' surface; and will only partially adhere to a surface with discontinuities such as weld -spatter, dust , rust, etc. NOTE: a surface that is contaminated with trace moisture might have this same appearance... especially after a warm/hot coating cure.
Even if completely clean using chemical or steam methods, weld spatter [or any other raised surface particulate] will generally cause paint-coatings [with high solids/pigments] to 'bridge' [create a small air void/cavity at/around these raised/pinpoint details]. Voided paint [IE; with pockets of air and/or moisture] may be expanding due to heat [and joining many small voids together?] without popping/tearing the paint blisters.
Suggest using a stiff long weld rod [sharpened to a point] to poke at these 'blisters'.
Regards, Wil Taylor
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RE: Blisters