Current question and answers:
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Q. Hello,
I am currently working on a project that involves generating repeated short-duration high-voltage pulses (around 6 microseconds and 80 kV) and making current flow though an aqueous solution. For this, I have been using stainless steel 316 in the shape of plates as electrodes, but the amount of iron, chromium and nickel ions released is too high. Unfortunately, this contaminates the treated solution and makes the electrodes last very little.
I was wondering if there was any type of plating that could withstand these high voltages. As far as I know (no experience), titanium works very well and it can be plated with inert metals like ruthenium, rhodium, palladium, iridium, platinum and gold. Do you think any of these are worth trying or if they could even work? Do you recommend other plating materials?
Thank you very much in advance for any advice that you can have.
Q. Does anyone have any information or experience with selective passivation of portions an Iridium surface? I know low concentrations of F will accelerate passivity of the entire surface, but is there a way to selectively passivate (permanently) small areas or edges - I do not want to grind off
Ed SkorupskiQ. The process involves continuous plating of copper out of acid sulphate bath on to a rotating cathode - the anode is wider than the cathode and as a consequence the hi-current density at the edge is manifesting itself as a "heavy" plated edge - because of the configuration and size of the anode and how the Ir coated anode plates are affixed to the subframe, mechanical methods are not feasible. When I use "passivate". I mean render non-conductive.
Ed Skorupski [returning]⇩ Related postings, oldest first ⇩
Q. I'm looking for an anode resistant to corrosion in aqueous media and at high voltage (25 - 50 volts). For example, When proceeding to electrolysis of water, a relatively inert anode which also has some good electric properties is required. I am looking for that kind of anode.
Vincent CaronRFQ: Our company is based in Malaysia and we are involved in plating of leadframes. We are presently looking for a vendor to plate iridium oxide on our titanium anodes. We plan to convert all our platinum anodes to Iridium oxide coated Titanium anodes.
Nick LimEd. note: This RFQ is outdated, but technical replies are welcome, and readers are encouraged to post their own RFQs. But no public commercial suggestions please ( huh? why?).
Q. I am searching for the electrical and corrosion properties of ruthenium oxide and iridium oxide anode coatings intended for the electrodeposition of cationic coatings.
Paul R. KerrQ. Dear Sir,
We are looking for the RESISTIVITY of IRIDIUM OXIDE ( IrO2 ). Many thanks for an answer on this subject.
Sincerely yours.
Jean-Michel.DESVIGNESA. The electrical resistivity of our IrO2 films is about 40 micro-ohm-cm (which compare well with that of single-crystal bulk IrO2). this particularly answers the questions of Jean-Michel.DESVIGNES from Lab. CHARLES FABRY de l'INSTITUT d'OPTIQUE and Paul R. Kerr.
-We have developed a new physical process to coat virtually any surface (Titanium is an excellent substrate with highly conductive and dense IrO2 films with an excellent adherence (Appl. phys. Lett. 69, () ) . So this is a direct response to the Nick Lim - Malaysia.
- These iridium oxides have been tested for some specific corrosion studies and they have exhibited excellent corrosion resistant behaviors. Other applications are currently under evaluation.
Prof. My Ali El KhakaniQ. I need information on how to coat Iridium on Titanium anodes. I am trying to coat a spring finger on a rack that is involved for plating.
James J. SezemskyQ. I am studying about DSA for chlor-alkali industry. I know that they are mostly made from titanium coated with titanium oxide - ruthenium oxide.
My question is this: How is the way of coating this DSAs? and what are the salts used in the coating? I will be thankful if you can guide me.
Yours faithfully,
Mohammad AbediMultiple threads merged: please forgive chronology errors and repetition ????
Q. I am looking for information on the use of Ruthenium or Iridium Oxide coated Ti anodes in electro-coating. Why are expanded metals used in this type of anodes? One would think it would be difficult to have complete coverage of the expanded metal. I'll appreciate hearing from someone with experience or knowledge in this area.
Want more information on iridium oxide coated titanium anodes? Feel free to contact us.
Thanks,
Paul LimRFQ: We are a service looking forward to supplying below product to our good customers. Kindly offer your quotation as below. Titanium Mesh Dimension: W250mm x L640mm x T1 mm, with Iridium Oxide coating as an insoluble plating anode. Life time: in pulse mode of rectifier, Fw120A / Rev240A(current density 120ASF) can last for hour. General need: 600~ pieces per year. If any question please let me know. We are looking forward to receiving your response soon.
Mika CEd. note: This RFQ is outdated, but technical replies are welcome, and readers are encouraged to post their own RFQs. But no public commercial suggestions please ( huh? why?).
Multiple threads merged: please forgive chronology errors and repetition ????
Q. The electrolytic chlorine generation industry and the "grounding" industry associated with galvanic corrosion both reference a Mixed Metal Oxide or MMO coated Titanium electrode. The metals referenced are NIOBIUM, PLATINUM, RUTHENIUM, IRIDIUM, etc. Does anyone have any details on this MMO coating and the process involved in producing this MMO coating? In addition, there seems to be new technology out there emerging which allows the polarity of the anode and cathode to change without damage to the coating. All info would be appreciated.
Thanks,
Q. I need the detailed information about how the mixed metal oxide coating on Titanium mesh.
SK.GajalakshmiQ. I need the detailed information about how the mixed metal oxide coating on Titanium mesh/plate.
John WongRFQ: We are interested in buy some anodes plated with the IrO2 coating, 50 square meters.
TONNY [last name deleted for privacy by Editor]Ed. note: This RFQ is outdated, but technical replies are welcome, and readers are encouraged to post their own RFQs. But no public commercial suggestions please ( huh? why?).
Q. How to coat the Iridium & ruthenium oxide with titanium metal.
aparna sivalingamQ. DSA. We need to coat the mixed metal oxide like Ir, Ru Oxide coating technologies.
regards
Q. We are using iridium coated anodes in our chloride zinc plating bath. After 3 weeks the resistance started going up and the current flow started down. I checked them with x-ray florescence and found the iridium is still there but I am now showing chrome also. I had a problem with chrome contamination around the same time. Could chrome immersion plate on the surface of the iridium and would it stop the current flow?
Chuck BeckerditeQ. Formula needed: I want to have Titanium Plates coated in Iridium for Hydrogen production in distilled water using a non caustic Electrolyte. What is the Electrochemical formula for the amount of hydrogen produced, by the amount of square inches of plate or mesh size, by the amps used?
Is there one?
Plate size example:
2.75" x 8" plates , 8 solid plates, or 8 mesh plates?
RFQ: I need titanium coated with a mmo that is compatible with KOH as an electrolyte and able to be used as an anode in electrolysis. I am looking for a price to coat both sides of titanium sheet .8 mm thick 4' x 8', 4' x 10', 8" x 8", 6" x 6", 4" x 4".
Jason BambenekEd. note: This RFQ is outdated, but technical replies are welcome, and readers are encouraged to post their own RFQs. But no public commercial suggestions please ( huh? why?).
RFQ: Need 3 square meters / month
David LeeQ. I am looking to bring Iridium coating in house. It is currently out sourced to a company that I believe is brushing it on. The material we are coating is Titanium and it is an anode structure.
I am not having much luck finding techniques or information on the topic. I think the people doing it now are roughing the surface then painting a coating on it, which is bluish (I believe IrO). Then I believe it is being baked in an oven.
Any help would be appreciated.
A. The substrate is sand blasted and pickled for the removal of scales. A paint of isopropyl alcohol with the metal chlorides along with titanium tetra chloride is painted by brush with no metal parts. It is baked in oven at 400 to 600 degrees. Painting and baking done many times to achieve the desired thickness. If wear resistance is needed iridium chloride is added, if catalytic action is needed ruthenium chloride is added, for water electrolysis, more platinum chloride is added. If high current density is required niobium is added. As far as I know.
Ganesanbala ChandranQ. We use Ti electrodes in electrolysis of salt solution. We need to coat the Ti with ruthenium and iridium oxide. Any suggestions about how to do it will be greatly appreciated.
Vinod SikkaI wanted a detail parameters for iridium coating on titanium plates. Also wanted to know whether these parameters remain same for MMO coating as well?
For more information, please visit platinized titanium anode.
Eshan Gupta