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.
    no popups, no spam
HomeFAQsSuggested
Books
Help
Wanteds
Advertise
on this site
FORUM
current topics
topic 4069

How to clean hot rolled steel for preparation of a rust finish?


(1999)

What can be used to clean hot rolled sheet steel to remove the factory coating? The reason I ask is because I make lamp shades and finish them with a rust finish. Someone had suggested I use muriatic acid? Is there a less toxic chemical available to clean this rolled sheet metal with?

Philip Burch
custom furniture - Phoenix, Arizona


(1999)

Dear Philip

You don't obligate to use Muriatic Acid , as a matter of fact every acid will do the job including Citric Acid . You have to remove the natural oxide layer which existing on the metal surface and then you will get rusted again.

TIP - You can increase the rate of rusting by using Salt Spray cabinet . Just put the part in it and you will get every level of rust you want

yehuda blau
Yehuda Blau
YB Plating Engineering and Quality - Haifa Israel


(2000)

I assume that you need to remove the scale from the steel. Inhibited phosphoric acid at 50-70 deg C preferably containing degreasing additives (commercial products readily available)will do the job in a stainless steel tank. Water wash and use a final hot rinse containing rust inhibitor. If you require higher paint performance you may need to consider further pretreatment stages.

Roger Bridger
- Croydon, Surrey, UK


(2000)

To remove any deposits of white rust I suggest an ambient temperature immersion in inhibited phosphoric acid with HF based activator. Immersion time 5 - 10 minutes then rinse in cold water and dry.

Alex Jennings
- Hawarden, North Wales



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