-- The Home Page of the Finishing Industry
23+ years of serious education, promoting Aloha,
& the most fun you can have in metal finishing smiley
    no popups, no spam
on this site
current topics
topic 5864

Med-Hot Black Oxide


I am interested in clearing up some details about blackening. Any help in the following two questions would be greatly appreciated.

We currently use a room-temp. black. Throughout the ten years of use, many of our customers have been dis-satisfied with the corrosion protection it offers. We have avoided hot-black because of the dangers involved. Recently we(engineering) proposed a new solution, an new system that supposedly uses alkaline technology. It is a med-hot (190-200F) black oxide. In our lab testing it has proved to be significantly better in inhibiting corrosion. Are any of you familiar with this process, and is it as good as hot black?

I also have a question about the possibility of masking during the blackening process. We are a clutch and brake manufacturer, and through lab testing have decided not to have the blackening process done to our friction interfaces. This causes us to go to a secondary machining process after blackening. Is there a way to mask this surface with a tape or adhesive, so we can do all the machining first, and then blacken?

Kevin Weiss
- Vadnais Heights, MN, USA


I have seen the new "195 black" and it looks quite impressive. I do not have extensive field experience with same but can tell you its quickly gaining popularity with end users. Masking ; I ran a hot black years ago , flat surfaces that stick do not coat really , , but do fringe coat. Masking may be an answer , but with what?

Ron Landrette
plating equipment supplier - Bristol, Connecticut


Hi Mr. K. Weis! We are a brazilian company and we would like to prove this new med-hot black oxide process. Could you please inform us where we can get it? Thanks in advance for your assistance Ricardo Bastos

Ricardo Bastos
- Diadema, SP , BRAZIL


As far as masking is concerned, I have been experimenting with grease. I am a hot black operator and know too well how grease will prevent the black from coating. Some of the larger parts I run have to be done half at a time. This will leave a brown stripe where the part touches the mud layer at the surface. Using grease to protect the already blackened part, I have almost eliminated this stripe. I use standard bearing grease. But I think something a little lighter might work better. Good luck, I look forward to hearing about your results. Aaron

Aaron Talcott
- Willoughby, Ohio USA

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