Dear Vinod Upadhyay ;

The concentration of the chromate inhibitor concentration depends on the service used, and the type of the corroded metal, as detailed in TABLE 10.1 in the attached reference. https://www.uv.mx/personal/rorozco/files/2011/02/CORROSION-INHIBITORS.pdf

Thank you Dr. Mahmood!

Dear Dr. Vinod Upadhyay ,

I suggest you also to have a look at the following, interesting paper:

-Chromate replacement: what does the future hold?

Oumaïma Gharbi, Sebastian Thomas, Craig Smith and Nick Birbilis

npj Materials Degradation, 2:12 (2018) - doi:10.1038/s41529-018-0034-5

Available at: https://www.nature.com/articles/s41529-018-0034-5.pdf

This paper highlights the negative impact of chromium compounds on the environment and human health.

This has led to the need to revisit most of the current industrial corrosion protection measures.

The work traces the origins of the reasons for replacing chromium, introducing the various regulations

actions to reduce the use of chromium compounds and critically review preventive alternatives to corrosion technologies developed in the last decades.

My best regards, Pierluigi Traverso.