-- The Home Page of the Finishing Industry
23+ years of serious education, promoting Aloha,
& the most fun you can have in metal finishing smiley
    no popups, no spam
on this site
current topics
topic 8852

Magnesium corrosion protection


I am developing a new housing and covers using a AZ91d mag casting. I will be using steel hardware to secure these together. The mag parts are finish with DOW20 under a powder coat(where these parts mate, there is no paint for emi issues).

Am I going in the right direction, with this type of protection?

I am also thinking about having the hardware zinc plated.

Carlos Santos
- Lowell, Massachusetts


Zinc plating the hardware is a good idea as there is the issue of bi-metallic corrosion between the dissimilar metals. If bare steel bolts are screwed into the magnesium they will corrode together and be almost impossible to remove.

Martin Trigg-Hogarth
Martin Trigg-Hogarth
surface treatment shop - Stroud, Glos, England


If this is for an outdoor application...I would suggest you run painted sample plates of your material in a salt chamber prior to introducing any other components. You will get a feel for the reactivity of az91d by itself, as it will be 10 times worse with other materials...especially a conductive gasket with Silver or Nickel. Dual gasket approach will be your best option if shielding is necessary.

James Hale
- Arlington Heights, Illinois, USA

This public forum has 60,000 threads. If you have a question in mind which seems off topic to this thread, you might prefer to Search the Site

ADD a Comment to THIS thread START a NEW threadView CURRENT 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

©1995-2018, Inc., Pine Beach, NJ   -   About   -  Privacy Policy
How Google uses data when you visit this site.