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surface treatment

Cataphoresis

What is cataphoresis and how does it work?

Cataphoresis belongs between basic and, at the same time, the most up-to-date surface treatments of metals. It can be used both for basic painting and in a combination with other surface treatments.

It is based on the electrophoresis principle with an aqueous solution of the epoxy paint – anolyte, into which a painted object is immersed. This object becomes a cathode in the direct current anolyte, thus attracting the colour cations.

Advantages of cataphoresis

 

Cataphoresis is applicable for

 

Key features of cataphoresis

Cataphoresis features exquisite anticorrosive properties, high adhesive power and low thickness.

Thanks to that, it is applicable both as basic surface treatment, possibly in a combination with zinc galvanizing, powder coating or painting (for example painting with acrylic paints or water-soluble paints) and as anti-corrosion surface finishing.

Cataphoresis can reach excellent properties when combined with zinc galvanizing or Zn/Ni electroplating andabsolutely superior anti-corrosion protection can be reached by adding powder painting to this combination.

Cataphoresis technological procedure

Chemical degreasing I – chemical degreasing II – 2x cold rinsing – activation – deposition of zinc-phosphate layer - 2x cold rinsing – passivation – cold rinsing – cataphoresic circuit nod - 2x rinsing by the ultra-filtrate – 1 x cold rinsing – blasting by air - baking kiln – cooling.

Technical parameters of cataphoresis

Lakum-KTL, a.s. (continuous line)

Standard paint layer thickness: 15 – 35 µm
Maximum dimensions of parts: 1500 x 500 x 1500 mm (h x w x l)
Maximum product weight: 50 kg
Maximum oven temperature: 170 – 235 °C

Other information

Cataphoretic surface treatment can be applied to any electrically conductive object including hot dipped zinc plated surfaces, zinc galvanized materials and aluminum.

Cataphoresis is suitable for painting of both small objects (continuous line in Lakum-KTL Frýdlant nad Ostravicí) and larger and heavier products – with a length up to 3 m and weight up to 550 kg (cyclic line in Lakum-Galma Humpolec).

Due to its productivity, the cataphoresis surface treatment is advisable for manufacture of parts in large series.

 

 

 

Powder painting

What is powder painting and how does it work?
Powder painting is a single-layer surface treatment of metals. This coating system is used in particular as final treatment of metal surfaces for protecting the products against corrosion, as well as for improving the aesthetic appearance of final products.

Powder painting is performed on a semi-automatic painting line using static application by corona. Powder particles are electrically charged using the electrostatic field, while the painted object is grounded. The resulting electrostatic force is sufficient to create an adequate layer of powder on the object. The powder remains on the place until it melts and adheres to the surface in a coherent layer.

Advantages of powder painting

● Ecological – powder coatings do not contain solvents,
● Resistance – metal is protected against scratching and other mechanical damages,
● Anticorrosive properties,
● Colour stability and a wide choice of many different color hues,
● Variability of the final appearance.

 

Powder painting is applicable for

● Automotive industry,
● Mechanical engineering industry,
● Building industry,
● Electrical power industry,
● Consumer goods industry.

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Key features of powder painting

Powder painting markedly improves aesthetic appearance of a final product. There is a variety of options as to the final finish from smooth gloss through various structural surfaces to a matt, coarse and rough variant.

Powder painting can be applied for both outer and inner surfaces of metal parts. Combined with cataphoresis, an excellent and stable coating system can be achieved.

Technological procedure of metal surface treatment by powder painting

Degreasing I – degreasing II – water rinse – drying following the pre-conditioning – application of powder paint substances – baking of powders

Technical parameters of powder painting

Lakum-KTL, a.s.

Maximum product dimensions: 200 x 1100 x 1100 mm (w × h × l)
Line capacity: 100 hangers per hour
Baking oven temperature: Adjustable up to 220 °C
Conveying speed: Adjustable up to 2 m/s

 

Other information

Powder painting surface treatment of metals is suitable both for large-lot painting in one colour hue and for small-batch treatment in a wide variety of colour hues. In Lakum we are capable to ensure both the manufacture of individual parts and their pre-treatment, which is crucial for ensuring the high-class quality of powder painting.

 

Linka GalmaCataphoresis means application of paint by an electro-phoresic method, whereby the painted product becomes a cathode in the direct current anolyte (water solution of the epoxy paint) and thus attracts the colour cations. Cataphoresis represents one of the most progressive production technologies of application of basic paints with a high degree of corrosion protection of metals. The cataphoresis method of paint application is considered to belong among the most advanced technologies of metal products surface treatments. Currently cataphoresis does not have comparable competition in series of production areas. The biggest contribution to the development of cataphoresis technology has automotive industry, where anti-corrosion resistance of bodyworks and other components is the focus of interest of all producers. High quality of surface treatment together with economic and environmental advantages predestined this technology to be used in other fields of engineering and consumer goods industry.

 

Zinc platingWhat is zinc electroplating and how does it work
Zinc plating, or Zn/Fe plating, (or possibly Zn/Ni), belongs between standard, traditional surface treatments of metals, which can be used both as basic and final metal surface treatment.

Simply put, galvanizing is depositing metal onto metal. This is an electrolytic process, during which a layer of zinc is deposited onto electrically conductive materials, mostly steel parts (a cathode), from a simultaneously dissolving zinc anode. This creates not only an anticorrosion layer, but also a pleasantly looking finish.

Advantages of zinc electroplating

● Suitable above all for surface treatment of steel parts, connecting elements, castings or forged products,
● Fast application,
● Economically profitable,
● Broad and highly variable application.

Zinc electroplating is applicable for

● Automotive industry,
● Electronic engineering industry,
● Mechanical engineering industry,
● Building industry,
● Consumer goods industry.

Zinc plating      Zinc plating

Key features of zinc electroplating

Electroplating features high quality, excellent resistance and outstanding anticorrosive properties. Thanks to them it is advisable both as a basic and final surface treatment of metals. Zinc galvanizing can reach excellent results when combined with cataphoretic painting, absolutely superior anti-corrosion protection can be reached by adding powder painting to this combination. Highly aesthetic coatings can be achieved this way.

Contact us: +420 737 283 921 This email address is being protected from spambots. You need JavaScript enabled to view it. Contacts

Technological procedure of metal surface treatment by Zn/Fe zinc plating or Zn/Ni electroplating

Chemical degreasing – two-step flow rinsing – pickling I – pickling II - two-step flow rinsing – electrochemical degreasing - two-step flow rinsing – decapping – one-step flow rinsing - zinc galvanizing or Zn/Ni electroplating - two-step flow rinsing – clearing up – drinking water rinsing - chromic acid rinse - one-step flow rinsing - one-step flow rinsing – sealing of chromates – drying

Zinc plating      Zinc plating

Technical parameters of zinc electroplating

Technology: Zn/Fe
Maximum dimensions of parts: 400 x 650 x 1100 (w x h x l)
Maximum product weight: 50 kg
Line performance per hour: 20 m2 per hour
Standard coating thickness: 8 – 12 micrometers

Rack zinc plating only.

Other information

Zinc galvanizing surface treatment can be applied to any electrically conductive objects, even for large-sized products. We perform both bulk (drum) and rack zinc plating. 

If required, electrolytically plated parts can be passivated (so-called chromated) and in case of need subsequently sealed by silicate paint. This enhances anti-corrosion protection of galvanized parts.

We use electroplating technology without Cr6+ in Lakum-KTL, a.s., in Lakum-Galma, a.s. and in Massag

linka ZinekZn electroplating  is an electrolytic process when, on the electrically conductive materials (in most cases steel parts - cathodes) a layer of zinc is deposited while the zinc anode simultaneously dissolves. This creates not only an anticorrosion layer but also architectural coating. Suitable materials for galvanizing are steel parts or casting or forgings. Quality of surface treatment is directly dependent on the quality of the input material. It is necessary that the parts are handed over to the galvanizing without coarse scales, excessive grease, paint or deep corrosion.

 

  

Technology

Powder coatings are among the single-layer coating systems used most frequently for metal surfaces. From the perspective of ecology is one of the benefits that powder does not contain solvents. From the perspective of the technology itself, especially in relation to the surface pretreatment prior to application, the application of powder coatings require a specific approach.

Powder coatings are applied by spraying in an electrostatic field. Using the electrostatic field is electrically charged powder particles, while the painted object is grounded. The resulting electrostatic force is sufficient to create a sufficient layer of powder on the subject. It will remain on site until the melt and adhere to the surface.

Generally, the surface material to be powder coated must be absolutely dry and clean. Prescribed finish components before the process is necessary condition for obtaining high-quality and durable coating, or layer with corresponding properties.