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 4597

What is "pre-dip blackener" made of?


(2000)

Hi, several companies make a "Pre-dip blackener" used in the firearms industry to give a "black" finish to Manganese Phosphate coated weapons.

I know a few companies sell this product (Mount labs', Brownells [linked by editor to Brownells website]). But what exactly is this stuff?

You dip the long arm in the pre-dip blackener solution then into your phosphate bath for processing. The result is a truly "black" phosphate coating that won't come off as opposed to the charcoal to dark grey we normally see.

What exactly is this stuff? Antimony Trichloride?

What?

Any help is appreciated. -Russ

R.B. Rogers
- Tampa, Florida USA


(2000)

Russ - Manganese (and zinc) phosphate blackening pre-dips are an acidic antimony compound. Some are better than others for color consistency.

Dan Brewer
chemical process supplier - Gurnee, Illinois


(2000)

Does the Tenifer finish of Glocks pose a problem for getting a good even finish with the pre-dip blackener and phosphate finishes? Is it necessary to strip the existing phosphate off prior to refinishing? Could scratches to an existing phosphate finish be touched up with pre-dip blackener and the phosphate finish or is it necessary to totally refinish for a good match?

marty
- melbourne, florida

Ed. note: full name next time, please, Marty.


August 10, 2009

Tenifer is a proprietary process that is similar to QPQ or Melonite. I do not believe you can phosphate this already plated part, but would have to strip it. Its not an easy coating to remove, due to its high surface hardness.

Jeff O'Brien
- Tucson, Arizona



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.