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Phosphating




Dear Reader :

I am manufacturing phosphating chemicals (I started this as a hobby). I use phosphoric acid with zinc oxide [affil link] and little nickel nitrate with Sodium Nitrate [affil link]. This in a hot bath does not work. Can anyone guide me?

Regards,

Harish Chitkara
- Chennai, India
2001



2002

Try sodium nitrite as an accelerator rather than sodium nitrate.

Ron Zeeman
Continuous Colour Coat - Brampton, ON, CAN



Can anyone suggest material sources for Class 4 phosphating as per DOD-P-16232 [ed. note: replaced by MIL-DTL-16232 [affil link or from DLA] ]?

Aryeh Asher
- Ashkelon, Israel
2000


Can you put your specifications in detail? Based on your requirement we can suggest for the chemical or the process.

DR.D.SEN
- calcutta, INDIA
2000



Dr. Aryeh Asher,

You might give Ted a wrong impression that there are no suppliers in your country....-:)

sara michaeli
sara michaeli signature
Sara Michaeli
Tel-Aviv-Yafo, Israel
2000



Country? I thought Israel was a city.
(only joshing, folks)

Ted Mooney, finishing.com
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
2000



Which is the best phosphating method for powder coated product? hot or cold.

K.L.Nemade
irrigation systems - Jalgaon, M.S. INDIA
2006



The best is usually the most difficult and most expensive, K.L. Zinc phosphate with a final chrome rinse is probably the 'best'.

Ted Mooney, finishing.com
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
2007



I want to know the right pretreatment & powder coating process for metal irrigation water filters AS these filters will be always in contact with water & soil may have some contact with fertilisers ( specially in case of fertiliser tanks ) & of course always in open sunlight & mounted in the farm itself for paint durability & resistance to corrosion ,protection against weathering effect ?

I have already done experiments of existing seven tank pretreatments ? & various ( epoxy & pure polyester & hybrids )

if someone know specific way of coating of water filters & fertiliser tanks pl. tell me.

V.R.PATIL
irrigation systems - Jalgaon, MS, India
2007



We buy some spherical plain bearings from market & dealers give different brands according to availability. Japanese makes looks deep black colour, local makes are light grey. Catalogues say only phosphated. What is better? Black oxide also acceptable? Please clarify.

Regards,

S M Sundaram
- Tamilnadu, India
2002



Hi, go for manganese phosphate it blackish in colour and secondly it is recommended for the parts where some lubrication is required eg: bearings, pinnion etc. Grey finish is of zinc phosphate and zinc phosphate looks grey in colour.

Qutubuddin Saify
- U.A.E.
2002



2002

Dear Mr Saify,

Thanks for the reply. Would you suggest the cycle time for Mn Phosphating, because it is eating the material, or should we have to keep stock considering erosion. Pl advise for bearing steel material SAE52100, High Carbon High Chromium steel erosion pattern

Regards,

S MEENAKSHI SUNDARAM
- Chennai, Tamilnadu, India



Mn phos time should be 10 mins. The imported bearings are not Mn Phos, they get the dark tone on account of different heat treatment process.

Khozem Vahaanwala
Khozem Vahaanwala
Saify Ind
supporting advertiser
Bengaluru, Karnataka, India
saify logo
2002



Dear Mr. Sundaram,

Keep the bath pointage around 30 35 ml, control iron to minimum and immerse the component when temp is 95 C and above for 10 min.

Prabhakar Gupta
- Kanpur, U.P., India
2004




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