Hydrophilic aluminium fin stock | Precoated aluminium fin stock

Hydrophilic aluminium fin stock
Coating structure
The effect of hydrophilicity
Coating types
Characteristic
Advantages
Coating performance

Hydrophilic aluminium fin stock Hydrophilic aluminium foil is the hydrophilic treatment on aluminum foil, coating a hydrophilic layer in it's surface layer through a special process, the condensate in the hydrophilic aluminum foil will quickly spread, and will not condense into water droplets. In this way, heat exchange area will be increased as well as the speed of cooling heating rate, and also effectively avoid the condensation of water caused by air flow noise.

Hydrophilic aluminum foil is the main raw material of home air conditioning heat exchanger and has a great impact on the efficiency of air conditioner. If using hydrophilic aluminum foil as heat exchanger raw material, the cooling efficiency can be improved by 5%, and also with function of anti-corrosion and anti-mold, free from odor, will not cause the accumulation of water droplets to affect the heat transfer.

Hydrophilic coated aluminum foil is the replacement of mill finish aluminium foil for air conditioner, used for different types of air conditioner heat exchanger heat sink, this hydrophilic aluminum foil is with coating a layer of thickness of 1 ~ 2um that is extremly strong anti-corrosion ability and excellent hydrophilic film.

Hydrophilic aluminum foil hydrophilic coating is generally divided into organic hydrophilic coating and inorganic hydrophilic coating. Inorganic hydrophilic coating of the overall performance to be slightly better, but the price is more expensive. Therefore, the general use of air-conditioning heat exchanger hydrophilic coating are organic hydrophilic coating, the common organic hydrophilic coating color is blue and gold.

Coating structure of Hydrophilic aluminium fin stock:

Coating structure of Hydrophilic aluminium fin stock

The effect of hydrophilicity

Aluminum foil surface with hydrophilic layer has a strong affinity for water, condensate on the fins spread quickly, not easy to form a "water bridge", so the ventilation effect of air conditioning operation works well. A measure of hydrophilicity is called a hydrophilic angle. Please find the comparison between ordinary aluminum foil and hydrophilic aluminum foil in the following table.

comparison between ordinary aluminum foil and hydrophilic aluminum foil

Coating types:

(1)Film with corrosive resistance inorganic resin

(2)Hydrophilic film: organic resin

Characteristic of hydrophilic aluminium foil

excellent hydrophilicity and corrosion resistance
good formability and no wear on the mold
a strong resistance to stamping oily, soluble, heat resistance
air flow resistance, heat exchange rate can generally increase 10% -15%.

Advantages comparing to Bare aluminium fin stock:

Can increase the anti-corrosion, anti-mold, no smell of the function;
The heat sink surface of the accumulation of condensate evenly distributed on the surface, not because of the formation of water droplets caused by heat accumulation between the block, affecting the heat exchange conditions, thereby improving the heat exchange rate of 5%;
Because the water no beads, the corresponding also reduced the noise caused by vibration;
To prevent air conditioning powder into the room to adversely affect the human body, in line with environmental requirements

Coating performance

SERIAL NO ITEMS TESTING METHODS RESULTS

1 superficies and appearance by eyes golden, blue, black

2 film thickness calculated from weight of film 2-3μm

3 original hydrophilicity test hydrophilicity directly ≥8mm

4 initial hydrophilicity dip in vaporing oil 3min (20±15℃) →vertical situation 7min at normal temperature → 210±10℃ dry 2mic → dip in pure water 10min → dry 10min/cycle at normal temperature, 10 circle → test hedrophilicity ≥6.0mm

5 salt-spray resistance JIS-Z-2371 (5%x35℃x72hours continuious slat spray ≥R.NO9.5

6 heat resistance A:200℃x10mins
B:400℃x10mins A:no changes B:turns light brown

7 oil resistance dip in press oil 24hours → wash in flowing water → peel test no delamenation

8 adhensive force A、bending 180°
B、peel test
C、erichsen value = 5mm 100% no delamination

9 odor by nose after dipping in water, and drying naturally no odor