ZINC PHOSPHATING (DIPPING APPLICATION)

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

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.

The DIAFOS 2000-1 treatment converts the metal surface to a non-metallic, fine-crystal, zinc phosphate coating which inhibits corrosion and increase the adhesion and durability of paint finishes.  This substantial increase in the paint life results from the fact that the coating providers:

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)

  Proses sederhana saat trial

 b. Rinsing, prevent contamination

    Product : City water

    Temperature : Room Temperature (RT), ambien

    Contact Time : 1 - 2 minutes

     (Proses sederhana saat trial)

 c. Activation

    Product : Dialene 80

    Concentration : 0.1 - 0.2%

    Temperature : Room Temperature (RT), ambien

    Contact Time : 1 - 2minutes

      (Proses sederhana saat trial)

d. Phosphating

    Product : Diafos 2000-1Alim 

    Concentration : 6.5 - 7%

    Temperature : 45 - 50°C

    Contact Time : 15 - 30 minutes  (depending on the thickness)

    

(Proses sederhana saat trial)

 e. Rinsing, (prevent contamination)

    Product : City water

    Temperature : Room Temperature (RT), ambien

    Contact Time : 1 - 2 minutes

     (Proses sederhana saat trial)

f. DI Water Rinsing, (prevent contamination)

    Product : Demineralize water (DI Water)

    Temperature :Room Temperature (RT), ambien

    Contact Time : 1 - 2 minute
    

(Proses sederhana saat trial)

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

ETCHING UNTUK ALUMINIUM (ACID BASED)

Proses Etching : pengikisan permukaan  (dalam hal ini Aluminium), untuk memberi dimensi, rongga atau kedalaman, sehingga siap untuk proses treatment selanjutnya. Biasanya proses ini juga berfungsi untuk:
a. Menghilangkan oksida/ pengotor yang terdapat dipermukaan aluminium.
b. Untuk membuat penampakan secara optik lebih baik.
c. Untuk membuat struktur permukaan sama dan merata.

Scanning Electron Microscope (SEM) images of a laser microtextured surface after used chemicals etching.

Proses etching berikut dengan menggunakan larutan asam (Acid Based), yaitu :

a. Diaclean ETC-770 (Acid Based)

DIACLEAN ETC - 770 adalah pembersih asam (acid based)  yang diformulasikan khusus untuk aluminium dengan aplikasi perendaman (dipping/celup).

DIACLEAN ETC - 770 mengandung surfaktan yang kuat sehingga tidak ada kebutuhan untuk degreasing terpisah . Atau dengan kata lain, mempunyai dua fungsi sekaligus yaitu membersihkan dan pengikisan ringan (dasar) terhadap permukaan aluminium . DIACLEAN ETC - 770 terutama diformulasikan untuk aplikasi yang tidak memerlukan etching mendalam untuk proses akhirnya. 

DIACLEAN ETC - 770 memberikan permukaan yang lebih halus pada permukaan metal yang diproses, sehingga menambah nilai komersial dari aluminium.

Hal ini membuat DIACLEAN ETC - 770 ideal untuk digunakan dalam proses metal pre-treatment sebelum konversi coating dengan larutan kromat (Chromating).

DIACLEAN ETC-770 digunakan dengan aplikasi sebagai berikut:

Konsentrasi : 4 - 8 % (v/v)

Temperature  : Ambient

Time              :  1 - 10 minutes

Total Acid     :   2.5 – 10 ml

 Proses etching

For more details, please contact us :

PT. Aalen Chemicals Indonesia

Jl Pulobuaran III Blok G3,

Kawasan JIEP Pulogadung

Tlp : 021-46830522

Web : www.aalen.co.id

Email : aalen.chemicals@gmail.com, aalen@cbn.net.id