-- The Home Page of the Finishing Industry

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

topic 3565

Iridite is smutty


I am using 25% by volume nitric acid as deox (I've even tried 50%) I still have to wipe the traces of smut off the aluminum parts in order to get smut free clear Iridite finish.

Adel Taghdi
Nepean, Ont.

First of two simultaneous responses--


Hi Adel ,

i suggest that you try the following Deox it is in wide use on Al / alloy wheels as a Deox
30 % by volume of 70% Nitric Acid
20 % By Volume of 98% Sulfuric Acid
1 pound to the US gallon of Ammonium Bifluoride

Be careful with it but it definitely works especially on alloys with high copper & high silicon .

Best regards

John Tenison-Woods
John Tenison - Woods
- Victoria Australia


Second of two simultaneous responses--


You didn't specify the alloy you are trying to chromate. There are several types of deoxidizers for the various types of Aluminum so you have to match the chemical to the alloy.

jim conner
Jim Conner
Anoplex - Dallas, Texas USA



If the aluminum alloy is high in copper or silicon you could try Deoxidiser 7-17 which I have found to be most successful either as a deoxidiser or a desmut.

I am replying from the UK but there must be an equivalent material in the US.

Brian James Ormsby
- Southend on Sea

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