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"Zinc phosphating bath"



2005

Hello!
I am a metal engineer. I study about converting coating(tri cationic phosphating bath).My coating bath ingredients is:

1.H3PO4:10(g/lit)
2.zno:6(g/lit)
3.NICKEL NITRATE:3
4.MN(NO3)2:1
5.NaNO2(ACCELERATOR):1
ph=3 T=50-60(c) t=5-7(min)

My process stages cosist of:oil cleaning-acid washing(sulforic acid5%)-water rinse-phosphating bath-water rinse

The result coating is very smooth,dense and light gray color.but after two time immersion coating the bath is not work

good.my coating pieces are steel plates.(st37)
how can I improve the bath?
must I add other materials in working bath?
what are the best conditions of my bath?
what must I add to the bath for increase the saltspray time?
my bath sludge is very high.the way of coating is immersion. how can I solve this problem.

Amir Khakzad
- Tehran
^


2005

Hi Amir,

Your primary problem is that you appear to be using a "home-brewed" zinc phosphating bath. I suggest to contact a supplier of pretreatment chemicals and they can suggest a product that is properly formulated for your application.

George Gorecki
- Naperville, Illinois
^

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