Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ
The authoritative public forum
for Metal Finishing since 1989
-----
Peeling after 180 Degree bend test
I did EN over Al. One of the criteria spelled out is no peeling after a 180 degree bend. Though it's not really peeled off, some blisters can be seen especially near the edge.
Any advise will be greatly appreciated.
Job shop plater - China
2005
A 180 bend test is a very rigorous test for EN on aluminum.
You need a superior zincate and an excellent strike. Are you using the largest allowed mandrel for the test?
- Navarre, Florida
2005
2005
While the coating will crack perpendicular to the bend, it should not flake, peel, blister, or otherwise come loose from the substrate.
Poor adhesion is almost always because of inadequate pretreatment. You do not say how you cleaned the coupons.
Ron Duncan [deceased]
- LaVergne, Tennessee
It is our sad duty to note Ron's passing on Dec. 15, 2006. A brief obituary opens Episode 13 of our Podcast.
(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
Q, A, or Comment on THIS thread -or- Start a NEW Thread