Home
 
FAQs
 
Good
Books
Public
Forum
SEARCH  🔍
This Site
finishing.com -- The Home Page of the Finishing Industry
Not a lecture hall but a roundtable with a seat for you!
60,000 topics spanning 36 years. Education, Aloha, & Fun


topic 2278

Does Zinc Plating Cause Hydrogen Embrittlement?



1998

Does zinc plating reduce the strength of the underlying metal? I have been told that the acid bath introduces hydrogen into steel, reducing its strength. The specific application is bolts used in flanged connections for industrial process piping. How much reduction in strength? Does the same situation occur in hot dipped galvanized steel? Technical articles/references?

Thanks.

John Byrne
design - Richmond, Virginia


1998

Dear John ,

What you should have been told is that Zinc Plating can induce "Hydrogen Embrittlement" in certain steels with a hardness of greater than 30 Rockwell C .

The plating does not lessen the hardness of the steel but it makes it inclined to break from a "Brittle Fracture"

there are ways of lessening the effect of this phenonemon by baking for several hours after plating , the correct procedure is laid out in the ASTM Specifications .

Plating Zinc from Acid Chloride baths is not as likely to cause this phenonemon as these baths approach 95 +% in effeciency whereas a Cyanide Bath which has been in constant operation for a number of years will probably be plating at about 65% effeciency .

There is a process called Mechanical Plating that claims to offer no Hydrogen Embrittlement , it is in use by most of the motor companies on their critical parts in braking assemblies "etc" for this very reason .

Do a literature search under "Hydrogen Embrittlement" and it will turn up the papers you want

regards

John Tenison-Woods
John Tenison - Woods
- Victoria Australia


1999

Thought must also be placed on turned metal parts that are hardened. An issue recently occured where a special self tapping screw being hardened after forming and then plated gave failures due to hydrogen de-embrittlement.

Charles Tones
security systems - Birmingham,England

adv.   anoplateyoutube

Q, A, or Comment on THIS thread SEARCH for Threads about ... My Topic Not Found: Start 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 need a product/service, please check these Directories:

Jobshops Capital Equip. & Install'n Chemicals & Consumables Consult'g, Train'g, Software Environmental Compliance


©1995-2021 finishing.com, Inc., Pine Beach, NJ   -   About finishing.com   -  Privacy Policy
How Google uses data when you visit this site.