-- The Home Page of the Finishing Industry

on this site
current topics
Live! From beautiful Pine Beach New Jersey: Welcome to the world's most popular metal finishing website

topic 54602

Intermittent Pitting After HAE Magnesium Anodise

March 18, 2010


We have machined AMS4439 [link by ed. to spec at TechStreet] castings HAE anodized at a surface treatment supplier. On occasion, the parts have hundreds, if not thousands of tiny black indications of minimal depth. The part can also have short wormlike black indications of similar depth to the black dots.
If anyone has an idea as to the root cause of this intermittent deviation, it would be greatly appreciated.

Grant Morris
Manufacturing planner - Montreal, Quebec, Canada

March 22, 2010

Do you perform vacuum impregnation on the casting? I'm not 100% sure that is your problem, but I do know that impregnation addresses some of the problems associated with magnesium castings.

Jon Barrows
Jon Barrows, MSF, EHSSC
Springfield, Missouri

If you have a question in mind which seems off topic, please Search the Site

ADD a Q, A, or Comment on THIS topic START an UNRELATED topicView CURRENT HOT TOPICS

Disclaimer: It's not possible to 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 may be deliberately harmful.

  If you need a product/service, please check these Directories:

JobshopsCapital Equip. & Install'nChemicals & Consumables Consult'g, Train'g, SoftwareEnvironmental ComplianceTesting Svcs. & Devices

©1995-2019, Inc., Pine Beach, NJ   -   About   -  Privacy Policy
How Google uses data when you visit this site.