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

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

topic 17433

Vac Cad plating problems and fatigue failures in H-11 tool steel


2002

We process H-11 tool steel threaded parts and we are achieving fatigue results of 300,000 cycles and more prior to Vac-Cad plating. The parts are then sent to the plating company and lightly blasted with low pressure using glass bead or aluminum oxide. We have found that over the years we have had better luck with the Glass Bead and we have tried different platers. The problem is, we still are experiencing too many failures. We require 65000 cycles at final testing and we are not even meeting that. The finish on these parts are more rough after the plating. We can see this through metallurgical evaluations. Is there another way to pre-treat these parts prior to plating and still achieve the adhesion? We must plate to MIL-C-8837 and we would prefer not to acid clean unless it is more beneficial. Is the time between plate and post bake as critical as the cad plate per QQ-P-416 [link by ed. to spec at Defense Logistics Agency, dla.mil] ?

Thanks,

Don J. Huffman
- Torrance, California, USA


2002

The VacCad plating process should not reduce the fatigue strength of the steel but your preparation treatment may. Have you tested the fatigue strength after preparation but before VacCad plating?

Donald M. Mattox
Society of Vacuum Coaters
Albuquerque, New Mexico

Ed. note:
            Mr. Mattox is
            the author of -->



2002

No we have not tested fatigue prior to plating as the spec requires that plating shall be done immediately after abrasive pre-clean and the parts are not plated at our facility, but at an outside source. Can you recommend a pre-clean light blast prior to plate? We have tried Aluminum Oxide and Glass Bead.

Don Huffman
- Torrance, California USA



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