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 10870

Platinized titanium anodes for electroplating


Q. How can you test if platinized titanium anodes still have coating of platinum? What can destroy it? This is in reference to chrome related plating. What will be the effect on plated surface? If plating has patches, could it be due to this? (bad electrical contacts are ruled out)

Payal Mag
- Charlotte, North Carolina


 

A. Put a torch to it. If it discolors, there's no Pt left.

James Totter
James Totter, CEF
- Tallahassee, Florida


Platinized Titanium Anode

 

A. This is easy. Take a cigarette lighter or small torch and play the flame on the anode mesh until it glows red in dim light. Once it is cooled, if there is an area of discoloration, then the platinum has been plated off. By the way, you can get Titanium or Columbium (Niobium) anodes re-platinized cheaper than buying them new.

Mike Brewington
plating shop - Salisbury, Maryland


 

A. Look under a microscope to see if you have the Ti showing. It should be gray in color whereas the Pt is black. Also if you have access to XRF and the anode fits in the chamber you could do a spot analysis to see if you have any Pt left. Usually the coating fails by erosion, as you plate you generate lots of gas and the gas bubbles wear away the coating. Another way the coating fails is by porosity in the coating. When this happens you get solution undercutting the adhesion between the Pt and Ti. As for the spots on your parts check the thickness by XRF our what method you use to see if you have a thickness distribution problem in those areas.

George Shahin
George Shahin
Atotech - Rock Hill, South Carolina


 

A. VISUALLY YOU CAN SEE THE DIFFERENCE IN color OVER A PERIOD OF TIME. IF THE THICKNESS OF COATING IS LESS BECAUSE OF DISSOLUTION (EVEN ITS SAID TO BE INERT)THE COATING WILL DISAPPEAR AND IT WILL BE LEFT WITH ONLY TITANIUM(BLACKISH color). THIS WILL NOT LEAD TO PATCHED DEPOSITION, BUT IT IS SURE TO AFFECT THE CONDUCTIVITY OF ANODE AS TITANIUM IS A POOR CONDUCTOR.

S.J.VENKATASUBRAMANIA RAJA
- HOSUR, TAMIL NADU, INDIA


 

A. Perhaps you can test the amount of voltage you need to pass the same amount of current in equivalent conditions.

Take a new conforming anode of the same size and shape, and compare voltage required to pass current at 100 amperes per square foot cathode current density.

High anode current density can reduce the life of the auxiliary anode.

Patchy plating could be the result of de-platinized anodes.

tom pullizzi monitor
Tom Pullizzi
Falls Township,
   Pennsylvania 


 

A. Very simple, put the platinised anode in the furnace and heat it up to 500 °C. The result is - the oxide is to formed as block color in unplatinised area. Platinised area is too bright like silver.

Vanajambika Jeyakumar
- Chennai



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.