No passwords, no registration, no paywalls, no popups, no AI

As an Amazon Associate & eBay Partner we earn from affil links

finishing.com -- The Home Page of the Finishing Industry

Search our quarter-million Q&As

Home of the finishing HOTLINE since 1989

-----

Blisters in the hardcoating process

I am a quality manager at an finishing shop. I am looking for information on what causes blistering in the hardcoat process. The problem does not seem to be alloy specific. 2011 alloy and M1 alloy have both shown this appearance recently. I have also seen blistering on 7075 not within the last 4 years. Any guidance would be appreciated.

Thanks,

Timothy Berry
Anodizing Shop. - Detroit, Michigan, USA
2004

2004

Too thick hard coat on inside curves will crash the growth and fracture. Anodizing over work hardened surfaces will exfoliate if too heavy thickness Anodizing over embedded trash from steel shot peening, time savings, tumbling, etc will exfoliate.

Anodizing over partially intermittent old aluminum oxide left behind by inadequate deoxidation and usually following heat treatment, that too, will exfoliate.

Robert H Probert
Robert H Probert Technical Services

Garner, North Carolina

Sorry! Finishing.com is temporarily Read-Only.
Ted Mooney is retiring but I have several offers to take it over.
We're working hard to make sure we find it the best new home.

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: