Sciencemadness Discussion Board
Not logged in [Login - Register]
Go To Bottom

Printable Version  
Author: Subject: Titanium etching
underground
National Hazard
****




Posts: 448
Registered: 10-10-2013
Location: Far from the stars
Member Is Offline


[*] posted on 16-2-2019 at 02:55
Titanium etching


I would like to etch a titanium sheet with electrochemistry. Since i do not have access to HCL i was thinking to use an oxalic acid solution to etch the titanium sheet at room temperature. My intention is make a Mno2 anode for chlorate production. Any thoughts ?
View user's profile View All Posts By User
Simoski
Hazard to Self
**




Posts: 57
Registered: 24-12-2017
Location: Johannesburg South Africa
Member Is Offline

Mood: No Mood

[*] posted on 16-2-2019 at 08:37


clean, dry and wipe with acetone.

electrolyse in sodium hydroxide 50 grams per liter.

titanium as the anode.

20 minutes. 2amps 5 volts.

thats a guess

[Edited on 16-2-2019 by Simoski]




View user's profile View All Posts By User
underground
National Hazard
****




Posts: 448
Registered: 10-10-2013
Location: Far from the stars
Member Is Offline


[*] posted on 16-2-2019 at 16:36


Wow thanks
View user's profile View All Posts By User
markx
International Hazard
*****




Posts: 545
Registered: 7-8-2003
Location: Northern kingdom
Member Is Offline

Mood: Very Jolly

[*] posted on 17-2-2019 at 10:23


Hot phosphoric acid (approx. 50%) will etch Ti very nicely. Ive used the method as a precleaning treatment for Ti before deposition of Pt.
The electorlytic etching approach will likely not work....passivation of the surface shall hinder any reactions. One can sort of etch Ti under anodic potential, but the applied voltages have to be high and the resultant surface is not in a condition that can be called clean by any means.




Exact science is a figment of imagination.......
View user's profile View All Posts By User
underground
National Hazard
****




Posts: 448
Registered: 10-10-2013
Location: Far from the stars
Member Is Offline


[*] posted on 18-2-2019 at 03:07


Quote: Originally posted by markx  
Hot phosphoric acid (approx. 50%) will etch Ti very nicely. Ive used the method as a precleaning treatment for Ti before deposition of Pt.
The electorlytic etching approach will likely not work....passivation of the surface shall hinder any reactions. One can sort of etch Ti under anodic potential, but the applied voltages have to be high and the resultant surface is not in a condition that can be called clean by any means.


Any other way to etch Ti nicely? I do not have access to phosphoric acid too
View user's profile View All Posts By User
markx
International Hazard
*****




Posts: 545
Registered: 7-8-2003
Location: Northern kingdom
Member Is Offline

Mood: Very Jolly

[*] posted on 18-2-2019 at 03:42


Quote: Originally posted by underground  


Any other way to etch Ti nicely? I do not have access to phosphoric acid too


Well, you do not have to etch it as a "nonegotiable must". Just sand it clean with 240-400 grit wet dry paper and call it good. I really saw no difference in the longevity of sanded Ti vs. etched one as anode substrate. Both were outstandingly mediocre. Don't sand it with a very fine paper (above 400grit), the surface will become very hydrophobic and one can not wet it evenly with the Mn nitrate solution.
Also do not let the sanded Ti sit around, proceed immediately with the coating treatment after sanding. If left exposed to air the bare Ti will quickly form an oxide coat that serves as a barrier which shall proceed towards passivation under anodic conditions.




Exact science is a figment of imagination.......
View user's profile View All Posts By User
underground
National Hazard
****




Posts: 448
Registered: 10-10-2013
Location: Far from the stars
Member Is Offline


[*] posted on 18-2-2019 at 04:56


Thanks a lot markx, really appreciate
View user's profile View All Posts By User

  Go To Top