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Ted Mooney, P.E. RET
Pine Beach, NJ
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for Metal Finishing since 1989
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Surface of hot dip galvanizing bath is "creamy"
Q. My name is Dario, I am a General Manager at HDG facilities in Brasil.
My question is about the surface of the Zinc Bath.
The surface of zinc bath is expected to show the appearance of zinc oxide (powder), but lately the surface seems like "cream" with a certain viscosity. What would cause this effect?
Thank you.
- Sao Paulo, SP, Brazil
January 31, 2012
February 2, 2012
Sir:
Does this creamy surface have a color? If yes, what color? Do you use prime western or SHG zinc? Do you use additives? If so what and in what concentrations?
Regards,
Galvanizing Consultant - Hot Springs, South Dakota, USA
February 7, 2012
Dear Dr. Thomas
The color of zinc bath is grey (strong or dark intensive colour).
The zinc is SHG
The bath mix is:
Al : < 0,005%
Fe : 0,0246%
Ni : 0,0375%
Zn : 99,8416%
Thank you
- S.Paulo, SP, Brazil
February 8, 2012
Sir:
Do you buy pre-alloyed Ni/Zn zinc or do you use nickel powder plus a spinner to maintain 0.035% nickel? If you alloy nickel powder, is this the time you see the creamy surface?
Regards,
Galvanizing Consultant - Hot Springs, South Dakota, USA
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