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Swedish Finish Treatment
Whether corrosion protection or design, there are often special requirements for component surfaces. Manufacturing in sheet metal processing often include surface treatment carried out according to customer requirements.
For some processes, we can use our many years of business relationships with specialist suppliers for various surface treatment techniques, which had luckily developed an adaptation to European and American standards in the process of adapting to our strict quality inspection.
In addition to powder coating and painting, we offer our customers almost all options for sheet metal coating:
- Powder Coating
- Painting
- Electropolishing
- Finishing
- Pickling
- Etching
- Phosphating
- Electrophoresis
- Anodised Surfaces
- Galvanised Surfaces
- Glass Bead Blasting
- Stainless steel blackening
- Screen Printing
- Laser labeling
Patented Black Stainless Steel Finish
Why is Electroplating Important&How It Works
The purpose of electroplating is as follows: 1) to prevent metal corrosion, 2) to enhance the appearance value of the product, and 3) to enhance the functionality of the product (conductivity, light reflection, solderability, etc.). The common type includes Nickel plating,Chrome plating and Zinc plating.
(1) Advantages Of Chrome Plating
Chrome Plating CNC Machining Parts
We recommend using nickel plating properties to make the main surface wear-resistant, abrasion-resistant and corrosion-resistant.
It can improve the conductivity of the work material.
Even for complex geometries such as internal holes and grooves, chemical nickel plating ensures a uniform coating.
Nickel plating provides a bright and shiny silver appearance.
Due to the thermal properties of nickel, nickel-plated parts can withstand high temperatures.
It exhibits inertness to some chemicals such as alkalis, petroleum, salt water and some soft acids.
(2) Advantages Of Nickel Plating
Nickel Plating Bolts
It provides wear resistance, corrosion resistance, scratch resistance, hardness and low friction to the plated part or assembly.
The aesthetically pleasing shiny and reflective finish of chrome makes it suitable for enhancing performance and appearance.
The chemical inertness of chrome to certain chemicals, solvents and oils can protect the underlying components from these external factors.
This type of plating can also correct minor surface irregularities and imperfections.
Chrome-plated surfaces are easy to clean.
(3) Advantages Of Galvanizing
The zinc layer on the steel surface protects the parts from corrosion by acting as a sacrificial layer that corrodes before the substrate.
It is strongly bonded to the substrate. Hence, there is no risk of flaking.
Zinc metal is relatively cheaper than chromium and nickel. Hence, galvanizing is more cost-effective than other electroplating.
Thermal stability is another advantage of galvanizing.
The complexity of the substrate geometry does not affect the zinc deposition process.
Protecting metal parts with zinc coatings improves the original conductivity of the substrate parts, mainly for ferrous materials.
25㎛zinc Coating For 25mm Security Steel Door Leaf
25㎛zinc coating for 25mm security steel window leaf
Zinc coating idler rollers
Painting
Painting includes pre-processing, puttying/grinding, Primer painting, middle painting, top painting,and coating curing, and other works. Nowadays, there has been much progress in the automation coating line.
Pre Processing
When electroplating or painting, pre-treatment is required to remove oxide skin (oxide film or black skin), rust, dirt, etc. on the metal surface (acid rust removal), and remove attached grease (degreasing). Otherwise, it will have a significant impact on the adhesion and durability of electroplating and painting. In addition, if the electroplated surface requires gloss, polishing treatment is required. If the electroplated surface requires satin treatment, surface treatment such as sandblasting is required.If pre-treatment is carried out on aluminum plates, rough textures need to be polished to increase coating adhesion。
The pre-treatment process can increase the adhesion and oxidation resistance between the coating and the surface of the workpiece, which is beneficial for prolonging the service life of the workpiece coating.
Puttying And Polishing
Puttying and polishing are used to repair surface defects caused by poor bending and welding. Generally, low-end steel products in the market rely heavily on this process to conceal defects.
Primer Coating
The primer coating of the workpiece is mainly used for sealing the substrate. It could improve the coating’s impermeability, enhance the protection of the substrate, stabilize the metal surface layer, and enhance the adhesion between the topcoat and the metal surface.
Middle Coating
The middle coating is a crucial layer among the three coatings in the automatic coating line. The main function of this layer is to provide the required decorative colors for the workpiece, so that the appearance of the workpiece meets the design requirements, and to protect the surface of the workpiece from external environmental erosion. This process can greatly enhance the anti-aging ability of the workpiece, and it is the thickest layer of paint.
Top Coating
The top coating of the workpiece sprayed in the painting production line, is mainly aimed at enhancing the resistance of the workpiece coating to external erosion, protecting the topcoat coating, increasing the metallic luster of the topcoat color, and making the appearance of the workpiece more vivid.
Coating Curing
Each of the three coatings of primer, topcoat, and topcoat must be cured after spraying. After the workpiece enters the curing furnace, the curing temperature is relatively high, so the curing time does not need to be too long. The curing time required for different coatings and workpieces varies. Coating manufacturers generally provide the best temperature and time based on the characteristics of the coating. Of course, the coating manufacturer will also determine the appropriate curing temperature and time according to customer requirements.
If you encounter the problem of easy rusting when purchasing metal products at a very low price, it is basically because the supplier missed some important pre-treatment steps to save costs. This situation is very common in the low-end market, which is why companies specializing in exporting to USA&EU market are more honest.
Good surface treatment requires good equipment, skilled technicians, and strict quality control systems. As a manufacturer with 20 years of experience in the European and American markets, we have much more experience in surface treatment than normal Chinese factories and provide fully qualified products.
