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How to mask workpiece holes in black anodizing? is possible thanks to our supporting advertisers, including:
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Q. The customer wants to close the hole of the nut. I use nylon screws to close the holes. There are chemicals flowing out as shown in the picture.


Thanks for the advice.

Ple Wannamongkol
Anodizer in thailand- Lamphun Thailand
October 22, 2023

A. Hello, Ple.
Vinyl plugs in those holes would probably not leak like that.
Luck & Regards,

pic of Ted Mooney
Ted Mooney, P.E. RET
Striving to live Aloha - Pine Beach, New Jersey

A. Hello Ple
I hope I am not late to the party with my response.
Masking is a funny thing, not always any rhyme or reason as to why rundown of solution occurs. The best thing I found over my years was to rinse, rinse and more rinse. You don't always know when you rinsed enough but you will sure know when you did not.

All that being said what works many times is after the dye process, take the liad back to anodize for about 5 minutes, re-rinse the parts and then dye again. Many times this solves the problem (not all the time but many times). I used this trick for many years.

philip j. verzal
- newport, tennessee
November 14, 2023

Ed. note: Thanks Phil! I once read a 'Hints from Heloise' column where Heloise advised the writer: "If the wine stain hasn't dried ...", which sure sounded unlikely to me in the days of postal mail and type-setting and newspapers :-)
We can only hope that Ple will benefit from your posting but we know, like Heloise did, that lots of readers will.

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