-- 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 55264

E-coat and Hydrogen Embrittlement

June 24, 2010

We supply a customer with a latch that has a forged steel component, which is e-coated. A recent lot showed signs of being brittle. Can e-coat andphoretic paint processes create hydrogen embrittlement?

Craig Baker
buyer - Windsor, Connecticut, USA

July 29, 2010

Hydrogen embrittlement is normally never seen in CED coating. De embrittlement is carried out by heating the electroplated part as hydrogen embrittlement is very common in electroplating. An E-coated part is always baked and even if hydrogen embrittlement is suspected, this baking process should be curing it. I hope the part without the coating was also tested for comparison?

Gurvin Singh
Coatec India
supporting advertiser
Mohali, Punjab, India
coatec india

First of two simultaneous responses -- August 6, 2010

Dear Craig Baker
Brittleness will happen for lot of reasons.
Even in E-coat also it is possible.
In Electrical method possibilities are more. we are not able to do the de-embrittlement after e-coat.
Better you check the parts as per Gurvin Singh with & without coating.
If you have the problem Before coating, better you do the Stress relief process before coating.
if, you have the problem in After coating also, do the stress relief process.

Kannan Boopathi
- Salem, Tamil Nadu, India

Second of two simultaneous responses -- August 10, 2010

Further to what Mr Gurvin has written, Id like to add that the current used in CED is too minimal to cause generation of Hydrogen and that the epoxy covers the component almost simultaneously ensuring no generation of Hydrogen.

Since you have mentioned its a forging, please look into the pretreatment process, Id suspect a pickling operation has crept in someplace. Do the comparative tensile test on a part as it is, after pretreatment; and after E-Coat to determine the cause of failure.

Khozem Vahaanwala
Khozem Vahaanwala
Saify Ind supporting advertiser
Bangalore, Karnataka, India

saify logo

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.