No passwords, No popups, No cost, No AI:
we earn from 'affiliate link' purchases, making the site possible

Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ

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

  The authoritative public forum
  for Metal Finishing since 1989

-----

Avoiding peeling in painting aluminium castings for motorbikes

Motorbikes components in aluminium casting alloys suffer peeling of the present coating (one layer of polyester). The components works at about 130°C and are exposed to weathering and pollution. What kind of coating system may be recommended? We were thinking to silicon powder coating applied over a surface prepared with conversion coating.

Andrea Vecchi
engineering services - Carpi, Italy
April 21, 2010

Hi, Andrea; chromate conversion coating is ideal. Look into RoHS-compatible trivalent chromates per MIL-DTL-5541 [on DLA].

Regards,

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
April 21, 2010

For years we supplied 500 kls per month to a company coating aluminium casting for motor car cylinder head covers. I would imagine that epoxy although it tends to chalk (don't motorbike enthusiast always clean their bikes on a regular basis?) has superior adhesion and is the only powder you can grind back to the metal (show off lettering) without edge cracking and in addition has excellent corrosion resistance.

Terry Hickling
Birmingham, United Kingdom
April 21, 2010

(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: