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Yellow streaks in clear anodizing



(-----) February 26, 2008

Hello,
I am having a problem with anodizing, we are trying to anodize 36 x 83 inch cabinets and after the process there is a yellowish to brown steak running a straight line with the grain of the material, I have tried sanding the cabinets with a thousand grit sandpaper it seemed to help but know I can see the swirl marks of the orbital sander.Any help would be appreciated.
Thanks,

John Jacob
engineer - Colorado
^


First of two simultaneous responses -- February 28, 2008

John

What is the alloy? Are the streaks vertical with respect to part racking (drips)? At what step in the process do the flaws become noticeable? Is this a new problem or new part/process?

Willie Alexander
- Colorado Springs, Colorado
^


Second of two simultaneous responses -- February 28, 2008

Come back and tell us more: Alloy?, Free acid? Dissolved Aluminum? Are you imbeding foreign material into the soft aluminum with the sanding? Is the sander designated aluminum only.? Surface Prep? What kind and how long in the deoxidizer? Chinese metal? Are you getting the current on the large flat thin part? Thickness measured in the middle?

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


March 3, 2008

I can say that this type defect comes from your material. Modifying bath temperatur,electrolyte concentration or current density etc could not solve this problem effectively, but if possible(allowed), you may eliminate the problem by changing the type of electrolyte (from sulphuric to Oxalic) or adding new surface preparation process (for example b-blast).

John Hu
- Singapore
^

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