finishing.com -- The Home Page of the Finishing Industry
A website for Serious Education, promoting Aloha,
& the most FUN smiley you can have in metal finishing

HomeFAQsBooksHelpWantedAdvertiseForum
topic 7350

Dull Stainless Steel After ElectropolishingˇÜ³.But I Want it Shiny!


(2001)

I am having huge problems electropolishing some 304 stainless steel wire. We use a Phosphoric, sulphuric acid bath and usually the wire is very shiny and highly reflective.

Using a new batch of wire, the surface is dull and on closer inspection much preferential etching is occurring. Have tried changing the current to see if this changes things, but unfortunately it doesn't.

Is there a problem with the bath (which appears to be electropolishing other parts quite well) or with the wire material?

Is there something I may be able to add to the bath to aid in forming a surface that isn't dull?

Thanks in advance.

Kayte Worrall
- Melbourne, Australia


(2001)

Two common causes of etching are:

Sound like the wire, but I don't really know what spec you would insist on. Hopefully, someone else can offer further advice.

Ted Mooney, finishing.com Teds signature
Ted Mooney, P.E. RET
finishing.com
Pine Beach, New Jersey


(2001)

Hi Kate,

If the same solution is being used to polish other items and they are OK, are you using a separate rectifier for the wire process? Then that could be the cause, possibly a phase out ? Over temperature could be another possibility.

Regards,

John Tenison-Woods
John Tenison - Woods
- Victoria Australia



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 Q or A to THIS thread START a NEW THREADView This Week's 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


©1995-2017 finishing.com     -    Privacy Policy
How Google uses data when you visit this site.