The surface finishing of copper sheets
While copper is generally appreciated for its decorative effect, it is not always desirable. So the oxidation, which goes into a deep brown and then into intense green, may even be disturbing. Especially with copper sheets on facades. Similar to the brass (copper-zinc-alloy) the shiny metallic brown effect can be obtained by a transparent varnish.
Brushing and dyeing due to various requirements
In addition, it is also common, for example, when using solar panels on a roof existing or necessary copper sheets to dye black. However, the copper sheets are not forced to mechanically provide a paint. Here mainly chemical (galvanic and electrolytic) processes are used.
Painting and varnishing techniques for copper and copper sheet verschiedene To apply the varnish to a copper sheet, different techniques are possible:
roll (foam roller or "mouse")
- spray (paint spray gun)
- In addition, the specialized trade also offers for each Requirement the optimal product. The decisive factor is whether it should be decorative or other aspects such as mechanical or chemical (against acids or alkalis) influences should be repelled.
- In addition, the range of colors and lacquers for copper ranges from high gloss to matt to transparent. Keep in mind that for exterior applications, due to the thermal expansion of copper due to large temperature fluctuations, frost and solar radiation, flexible lacquers are necessary which do not crack when the copper sheet is stretched.
Preparation work such as sanding
In order to remove any oxidation, but also to roughen the copper for painting, it must first be ground. For this medium-grain or grain interspersed grinding wheels are suitable. In addition, you can also clean a copper sheet by pickling. This is used, for example, when copper is to be chrome plated.
Step-by-step instructions for painting copper sheet
Priming suitable for copper
- Grease remover
- Suitable grinding tool
- Roller or brush for brushing
- 1. Preparatory work
- First, the copper sheet must be prepared. To do this, grind the sheet and rough it. Then you may need to clean it of grease stains (fingerprints). Ethanol (methylated spirits) is best suited for this purpose. Grund 2. Priming the copper sheet
Now you can paint the copper sheet with the primer. Apply the primer evenly in the cloister. According to the manufacturer's instructions, let the primer dry.
3. Paint the copper sheet
The copper sheet can then be painted. Also, the paint is applied again in the cloister. Maybe two passes are necessary. Then the copper sheet can be polished if necessary and sealed with clear lacquer.
Tips & TricksIn addition to the processing of copper sheets, the processing of copper pipes is especially important. Here's how to solder copper pipes.