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How to check the chromate content in dichromate solution





December 22, 2011

Q. Initially we make a standard bath of dichromate solution with two ingredients water and chromate solution but after use the ratio of water and chromate solution getting disturb because of deposition of chromate on parts, my question is what is the method for the testing of chromate content in solution

If chromate poorly deposited than there is chance of white rust appearance

Abdul Baseer Siddiqui
- Karachi, Pakistan



December 28, 2011

I believe a simple titration could be the easiest way to test the chromium concentration, but before I make a suggestion, I would like some more information about the tank.
What are you using this tank for or what is its purpose? The tank you described kind of sounds like a hot seal tank but I am not entirely sure based on the information you provided.
How big is the tank and what is the tolerance on the concentration?
Does the tank operate at a certain temperature?
What types of metals are you processing through this tank?
Do you have a picture of the white rust on a part?
Any additional information you can provide, will provide you with better answers.

Aimee Longacre
- Savannah, Georgia, USA



January 3, 2012

Thanks Aimee for your reply

Answers of your questions are given below:

Q- How big is the tank and what is the tolerance on the concentration?

A-Tank size is 2 ft x 2 ft x 2 ft and we have no any standard we are working only with experience (that is why I am asking this question)

Q- Does the tank operate at a certain temperature?

A-Room temperature

Q- What types of metals are you processing through this tank?
A-Free cutting steel with zinc plating (cyanide Zinc Plating)

Q- Do you have a picture of the white rust on a part?

A-It is normal white rust which appears in Salt spray test (96 Hrs test)

Abdul Baseer
- Karachi, Pakistan



February 11, 2012

Personally, I use titrations to monitor all my tanks from Dichromate to Nitric acid. It is the simplest way to do it, not to mention is highly effective.

Jose Morales
- Berkeley, California, USA


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