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Phosphating fails salt spray test

My phosphatnig solution doesn't withstand for salt spray test of 24 hrs.
I want it to withstand for atleast 48 hrs.this is main part of my project.
which chemicals along with H3PO4 should be added ?
The aim of my project is to protect mild steel for 48 hours or more...
please help me.

Sagar Deshpande
student - Alibag, Satara, Maharashtra
2007

2007

Hi

You can apply any good rust preventive oil after phosphating to meet your requirement.

Regards,

Anurag Kanaujia
A- New Delhi

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