Aquazinga

Components

– Water-based inorganic zinc silicate – Zinc powder

Density

3,36 kg/dm3 (±0,05 Kg/dm3)

Solid content

– 83% by weight (±1%)
– 63% by volume (±1%) according to ASTM D2697

Type of thinner

No thinner needed.

Flash point

N/A: water-based

Pot life

3 hours at 20°C, depending on ventilation and temperature.

VOC

0 g/L

Colour

Grey

Gloss

Mat

Zinc content

92% (±2%) by weight, with a purity of 99,995%

Special characteristics

– Atmospheric temperature resistance of dry film » Minimum: -90°C
» Maximum: 550°C with peaks up to 600°C

– pH resistance in immersion (at least 12 days after polymerisation) » Lower limit: 5,5 pH
» Upper limit: 9,5 pH

– Excellent resistance to abrasion
– Excellent resistance to certain chemicals

10 kg

Available in 7,6 Kg powder and 2,4 Kg binder

25 kg

Available in 19 Kg powder and 6 Kg binder

Shelf life

12 months in the original, unopened package.

Storage

Store in a dry environment at temperatures above 5°C.

Cleanliness

Before the application of Aquazinga the metal substrate should first be degreased, preferably by steam-cleaning at 140 bar at 90°C. After that it should be grit-blasted (clean grit) to cleanliness degree SA 2,5 to SA 3 (preferred) according to the standard ISO 8501-1:2007 or to the cleanliness degree described in the standards SSPC-SP10 to SP5 and NACE nr 2 to nr 1.

This means that the surface must be free from rust, grease, oil, paint, salt, dirt, mill scale and other contaminants.
Once the grit-blasting is completed the surface should be de-dusted with non contaminated compressed air according to the standard

ISO 8502-3 (class 2).
Another method to obtain a clean surface is UHP water-jetting to clean- liness degree WJ2 according to the standards NACE nr 5 and SSPC-SP12 level SC1. But keep in mind that this method does not create surface roughness.

Roughness

Aquazinga should be applied on a metal substrate that has a roughness grade of fine to medium G (Rz 40 to 70 μm) according to the standard
ISO 8503-2:2012.
This can be obtained by grit-blasting (with sharp particles) but not by shot-blasting (with spherical particles). Make sure that the surface is degreased before the gritblasting.

Maximum time to application

Apply the Aquazinga as soon as possible on the prepared metal substrate (max. 4 hours waiting time). If contamination occurs before coating, the surface must be cleaned again as described above.

Ambient temperature

– Minimum 5°C
– Maximum 30°C
– Do not apply Aquazinga in bright and hot sunshine

Relative humidity

– Minimum 40%
– Maximum 90%
– Do not apply on a damp or wet surface

Surface temperature

– Minimum 3°C above the dew point. – Minimum 5°C
– Maximum 25°C

Application methods

Aquazinga can be applied on a clean surface by brush and roller (small touch up or stripe coats) or conventional spray-gun but not by airless spraying.

Stripe coat

It is always recommended to treat corners, sharp edges, bolts and nuts before applying a uniform coat.

Mixing

Stir the binder in its original can and pour the zinc powder progressively into the binder while mixing until a homogeneous mixture is obtained.
It is recommended to filter the Aquazinga after mixing through a 150 μm (100 mesh) sieve.

Stirring

Aquazinga must be thoroughly mechanically stirred to achieve a homogene- ous liquid before application.
The liquid must be stirred continuously.

Cleaning

Immediately after using the spraying equipment, it must be rinsed with fresh water. Brushes and rollers should also be rinsed with water. Do not wait longer than 10 minutes before rinsing the spraying equipment if you have stopped spraying Aquazinga.

Dilution

Aquazinga is ready for use. Never dilute.

Type of brush or roller

Industrial round brush Short hair roller (mohair)

Dilution

Aquazinga is ready for use. Never dilute.

Pressure at gravity cup

2 to 4 bar

Pot pressure

0,8 to 1,5 bar

Nozzle opening

1,2 to 1,5 mm

Special demands for spraying equipment

– For the spraying of Aquazinga, it is better to remove all filters from the pistol to avoid blockage.
– The spray gun must be equipped with reinforced needle springs.
– Use short tubes.

– The needle and the spray tip must be made out of Tungsten carbide metal.

Theoretical coverage

– For 60 μm DFT: 3,25 m2/kg – For 80 μm DFT: 2,34 m2/kg

Theoretical consumption

– For 60 μm DFT: 0,32 kg/m2 – For 100 μm DFT: 0,43 kg/m2

Practical coverage and consumption

Depends upon the roughness profile of the substrate and the application method.

Ambient temperature

Drying time before atmospheric exposure

Drying time before immersion

20°C

24 hours

7-14 days

25°C

14 hours

7-14 days

30°C

10 hours

7-14 days

35°C

8 hours

7-14 days

Ambient temperature

Minimum drying time*

Maximum drying time

10°C

24 hours*

Limited; if overcoated after 48 hours after fully cured, Zinc Silicates might prevent good adhesion to subsequent topcoat.

20°C

16 hours*

30°C

8 hours*

40°C

4 hours*

Unique system

– Aquazinga is used as a stand-alone system, applied in 1 layer between 80 and 90 μm DFT or 2 layers of 60 μm DFT.
– When applied in a DFT* higher than 120 μm the coating can start to crack. Excessive thickness should be avoided as it will reduce the effectiveness of the system.

* DFT: Dry Film Thickness; to be measured above the peaks of the roughness profile.

Duplex system

– In a duplex system, Aquazinga should also be applied in one layer of
50 to 80 μm DFT.
– The surface of the Aquazinga should be free from zinc salts and other contaminations prior to application of a topcoat.
– Aquazinga can be topcoated with a wide range of compatible sealers and topcoats.
To avoid pinholes when topcoated, use the mist coat/full coat technique. For application of water-based topcoats, contact Zingametall representative.