plating, anodizing, & finishing Q&As since 1989
Room Temperature Blackening Problems.
Q. I have recently introduced Room temperature blacking chemicals for Blacking of Iron and steel and find that after the last process of dipping in de-watering oil, the blacking is coming off if rubbed. I would be grateful to learn how this problem can be solved or where I could be going wrong.Hemant Manek
- Calcutta, India
A. You don't say how aggressive the rubbing is, but I am assuming a relatively firm manual rub. You also don't say what oil is being used. That being said, you may be having an activation problem. Be sure to activate the parts in an acidic activator to ensure complete coating formation and adhesion. Remember though, even the best room temp black oxide can be rubbed off with a pencil eraser - these are decorative coatings, not necessarily protective or durable.Dan Brewer
chemical process supplier - Gurnee, Illinois
Q. Dear Sir, I want to know about steel blacking chemicals. If you have any information on this, please send me some. corrosion, price, break away, etc. Your prompt reply will be highly appreciated. best regards, James KimJames Kim
- Seoul, South Korea
A. Hi, James. Please see our Black Oxide & Cold Blackening FAQ for a quick intro.
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
February 23, 2009
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