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topic 11052

Problems with Ematal Bath


Dear sir:

We have to start Ematal Anodizing, but we have some problems with our chemical solutions. P.T.O. 10g/ltr. citric acid 10g/ltr. chromic acid 10g/ltr. 40to100v at 50deg c temp. We want solution on this. Our solution did not take long life.

Yours faithfully,

[inquirer's name & city deleted due to the age of the letter]
- India


Hello, you write P.T.O. Are you really using Potassium- Titanium- Oxide- Oxalate-2-H2O?

We have good experience without Cr and the solution will last at least several months.

If I shell help you, please tell me your questions.


Roberto Kistler
- Nussbaumén, Switzerland


Dear sir,
I am having problem with the ematal bath.I am using 10g/l potassium Titanium Oxalate Acetate, 10g/l citric acid and 10g/l chromic acid. Temperature at 50 °C.
My problem are:
1.What is the correct current density used?
2.The deposit is soft. The deposit will peel out when cut with a sharp aluminium part. How to make it hard as the hardness of quartz?
3. What is the deposition speed (micron/minute) when apply certain current density e.g 3A/dm2?
4.Please advise on the ematal bath ingredients e.g the chemicals and their concentration.
5.What is cathode material used?

Thank you very much in advance.

Bronson Cheok
Plating shop - Penang , Malaysia

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