Zinc phosphate (Zn3(PO4)2) is an inorganic chemical compound used as a corrosion resistant coating on metal surfaces.
Phosphate salts is applied via spraying or immersion and chemically reacts with the surface of the part being coated to form a layer of insoluble, crystalline phosphates. Normal operation pH : 2.6 - 3.0
The operation should be controlled, to make best result :
- Temperature (if use Hot Temperature)
- Time
- pH
- Product concentration
- Free and Total Acid
--Total acid is measure of total bath concentration/ Zn Content
--Free Acid is maintain Zn solubility
--Free Acid is maintain Zn solubility
The other chemicals should be add in Zinc Phosphating are :
- Accelerator (Dia Toner 20)
- Neutralizer (Dia Starter 40 - maintain pH, Free acid)
Advantage :
- Coating thickness 2.000 - 10.000 nm (usually 1.5 - 2.5 g/m2)
- High corrosion protection
Quality requirements on phosphate coating prior to painting :
- Uniform, small crystal
II. Zinc Phosphate, 2 kation (dipping application) :
Our Product : Diafos 2000-1 Alim, packaging : 30 Kg/can
DIAFOS 2000-1 chemicals are conversion coating agents formulated for treating mixed production of zinc-coated steel (either hot-dip or electro-galvanized) and steel. Limited quantities of aluminum can be treated. Cadmium must never be run through the solution because it will poison the bath. Immersion application may be used.
A. A clean, grease-free surface
B. A corrosion-inhibiting base for paint
C. A non-conducting bond between the base metal and the paint
D. A chemically inert surface which prevents reaction between the metal surface and the paint ingredients
Optimum process sequence of phosphating in Customer, Dipping application :
a. Degreasing
Product : Diaclean H-280
Concentration : 2 - 5%
Temperature : 40 - 60°C
Contact Time : 2 - 15 minutes (depending on the oil)
Contact Time : 2 - 15 minutes (depending on the oil)
Product : City water
Temperature : Room Temperature (RT), ambien
Contact Time : 1 - 2 minutes
Product : Dialene 80
Concentration : 0.1 - 0.2%
Temperature : Room Temperature (RT), ambien
Contact Time : 1 - 2minutes
Product : Diafos 2000-1Alim
Concentration : 6.5 - 7%
Temperature : 45 - 50°C
Contact Time : 15 - 30 minutes (depending on the thickness)
Product : City water
Temperature : Room Temperature (RT), ambien
Contact Time : 1 - 2 minutes
Product : Demineralize water (DI Water)
Temperature :Room Temperature (RT), ambien
Degreasing -- Rinsing -- Surface Conditioning -- Phosphating -- Rinsing -- DI Water Rinsing -- drying
Result of coating with phosphating:
Crystal view with SEM (Scanning Electron Microscopy), aplication via immersion (Dipping), material steel :
Magnification 1000x, appearance : round shape crystal, small size, uniform particles
For more details, please contact us :
PT. Aalen Chemicals Indonesia
Jl. Pulobuaran III Blok G3,
Kawasan JIEP Pulogadung
Tlp : 021-46830522
Website : www.aalen.co.id
Email : aalen.chemicals@gmail.com, aalen@cbn.net.id
Website : www.aalen.co.id
Email : aalen.chemicals@gmail.com, aalen@cbn.net.id