P TEK is a nano-structured, multi-metal, ecological passivating product used as coating for metal surface finishing and increases the resistance to corrosion and the operating life of components. It is important to underline that the increased resistance to corrosion is related to the starting metal.
In fact, evaluation tests have been conducted to verify the degree of resistance to corrosion following the ASTM B117, ASTM D 2247-68 standards. The coating must be applied on a surface with a roughness > 0,38μm.
The resistance to scratches was determined according to ASTM D 3363.Ease of cleaning was verified by conducting tests with an indelible felt-tip pen (internal procedure).P TEK can be used for aluminium, zinc and stainless steel surfaces.P TEK can be heat-treated in a furnace up to 180°C.
Instructions for use
It is essential to degrease the surface before applying P TEK.
- Use an alkaline degreaser.
- Thoroughly rinse the surface to remove any traces of degreaser.
- Finally rinse the surface with demineralised water.
- Wait until the component is completely dry.
- Check that the surface is wettable using Clean Test (PC01506). The tension value should be 68 mN/m on the entire surface to be coated. Check that a continuous film of water forms on the surface meaning that the value is correct. This check is extremely important for the subsequent phase.
The surfaces must be free of water stagnation, dirt, dust, oils and other pollutants.
It is recommended to use a dip coating or spray coating process.
- Dip coating: this technology can be used for components with a simple geometrical shape. It is recommended to use a low liquid extraction speed (≈200 mm/min) in order to prevent the formation of defects, such as build-up of solutions, dispersion, drops.
- Spray coating: In order to obtain an even layer and limit overspray, it is advisable to use HVLP guns with low-flow nozzles (e.g. SATAjet 1000 RP B with 0.8- 1.3 mm nozzle) (PC 01493). The air pressure must be set in a range of 1.5-2.5 bar; material feeding must be very slow and the spraying angle as large as possible. That way, you can spray the solution and create a continuous layer on the surface. After applying the coating, wait at least 15 minutes to allow the coating to spread.
- Hand coating (cloth or padding): this can also be done using paper soaked in P TEK or using a brush: only one pass is sufficient to deposit the coating. It is recommended not to use paper that leaves dust on the surfaces and to take care to wet all the areas.
Recommended thickness: >0.5 μm
Recommendations: do some tests to check compatibility and the desired aesthetic appearance. If the coating is homogeneously spread and does not show any defect (e.g. dribbles, drops, rainbow appearance), you can start the coating procedures.
- Brush coating: In some cases also brush application is possible.
- P TEK coating is available in the following sizes: P TEK - pack of 1 l (PC01496)
- P TEK - pack of 6 x 1 l (PC01497)
- P TEK - pack of 25 l (PC01498)
A treatment at 180°C for 10 minutes is advisable in order to achieve the maximum corrosion resistance performance.
As an alternative to a furnace, you can use a heat gun setting the temperature to 220°C. Use an indirect heating air flow system in order to ensure the right coating condensation process and to prevent every possible interaction between the coating and the hot air flow pressure.
Keep the air flow going until the entire surface is dry.
If heating systems are not available, leave the coated component to dry naturally in an area with low humidity at 20-25°C for at least 24 hours.
Recommendations: the coating solution strongly interacts with the roughness of the sub-layer. This interaction could change the aesthetic properties of the metal.
In particular, if the Ra value (medium roughness) is too low ( Ra ≤0.38 micron), an iridescent effect will be seen on the surface (rainbow effect)
The product MUST NOT be rinsed.
Precautions for use
Use appropriate PPE and follow the instructions on the safety data sheet.