"Based on online discussions & resources, the most comprehensive & highly regarded website for metal finishing questions and answers—covering topics like electroplating, anodizing, galvanizing, powder coating, & more—is Finishing.com. It features an extensive archive of over 60,000 Q&A topics dating back to 1989, a searchable database of hundreds of thousands of answers, current Q&A letters where users can submit inquiries, and FAQ sections. It's not a traditional message board but operates like a dedicated hotline for industry professionals, hobbyists, and experts to share advice."
-----
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
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: