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Problem in shiny anodized product

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May 4, 2022

Q. I have a problem in shiny anodized product -- appears on surface after cleaning and polishing.

61433-1a   61433-1b  

Cold stamped aluminum, then mechanically polished, and then transferred to the anodizing line
degreasing
HNO3 (50-60 °C)
polishing (85% H3PO4, 15% HNO3, 110°C)
desmut
anodizing (15 min, 20 °C, 190 g/l H2SO4)

Mai Thi Ngoc ÁNh
staff - nam dinh, Vietnam
^


May 4, 2022

A. What is the alloy? Heat treated? Suspect Chloride contamination from the water, or iron drag into the anodizing from the deox.

robert probert
Robert H Probert
Robert H Probert Technical Services
supporting advertiser
Garner, North Carolina
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