No cost, no registration, no passwords -- just aloha, fun & authoritative answers
(as an eBay Partner & Amazon Affiliate we earn from qualifying purchases)

Where the
world gathers for metal finishing
Q&As since 1989

-----

'Tiger Stripe' phenomenon in Black Anodize Electrolytic Coloring

Hi all,

I believe you all had heard about the 'Tiger Stripe' phenomenon in Black Anodize Electrolytic Coloring in AL 6061 T6 and also in AL 5053 H32. Currently is there any fact or root cause that cause the 'Tiger Stripe' phenomenon? I had done fews Design of Experiment, and roughly have a gut feel that this phenomenon is related to the surface roughness (Ra value). The very fine surface (Ra32~64, bead blasting surface) also will not have this phenomenon.

This are some of my finding, can somebody have more experience on this experience and make my finding more concrete.

I also would like invite those who know the chemical behind this process to share with us, and maybe we can have some ideas or brainstorm on what is going wrong.

Thanks

Collin, Chris
Undergrad Student - Singapore
2006

(No "dead threads" here! If this page isn't currently on the Hotline your Q, A, or Comment will restore it)

Q, A, or Comment on THIS thread -or- Start a NEW Thread

Disclaimer: It's not possible to fully diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations might be harmful.

If you are seeking a product or service related to metal finishing, please check these Directories: