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Iron phosphating conversion layer over a galvanized steel (spray system)

2005

The recommended PH for the iron phosphating bath differs according to the substrate type
( hot rolled steel - cold rolled steel - galvanized steel )

WHY the lowest PH used for the galvanized steel?
what is the best accelerator used in this system?
what is the best rust inhibitor used in the iron phosphate bath and what is the best chelating agent?
how to get a deep blue color for amorphous phosphate over the galvanized steel?

Ahmed Fouad Serag Eldin
Ein Shams - Cairo - Egypt

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