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Letter 20073
Pitting before anodizing
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Dear Sir,
Galvanic pitting have any relationship with material chemical
composition or any metallurgy effect. Recently, we found pitting
problem suddently appear on our 6063-T5 anodize product. This pitting
happen before anodizing process. The pit can be observed after
desmutting process. We leave the aluminium extrusion in rinsing tank
very short time. For information, one carry bar has two types
aluminium extrusion but only one type has pitting problem but the
other one do not have. Not all aluminium extrusion have pitting but
some particular extrusion facing this pitting problem. If titanium
jig which attached to aluminum carry bar holding aluminium extrusion
and touching with rinsing water, galvanic effect pitting problem can
be occured? If ion chloride in etching (caustic soda) tank too high
can resulting this pitting problem?
Thank you,
Eddy Lim
- Selangor, Malaysia
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