Gilding of brass and iron

The gilding process takes place on the AURUNA 556 gilding line, which is one of the best PCL lines in Europe. Both brass and iron parts can be gilded here. A layer of gold with a thickness of 0.2 μm is applied as standard, but it is possible to apply a layer with a thickness of up to 10 μm, even with high gloss. This type of gilding is suitable for both decorative and technical purposes. Gilding on the AURUNA 556 line also guarantees the stability of the gold layer in standard interior conditions.

The biggest advantages of the AURUNA 556 gilding line

Highest purity - Most gold baths use alloying elements to increase the hardness of the gold surface. However, this reduces the purity of the gold. Therefore, the great advantage of this gilding line is that it can achieve the same surface hardness without the use of an alloying element. That is why gold is still in the highest purity of 24 carats. It achieves the highest class according to the US standard.

Highest hardness - The line is able to achieve the highest hardness class according to the US standard without the use of alloying elements.

Largest part dimensions - Larger part dimensions of 1500 x 1100 x 300 mm (L x D x W) make it possible to process larger parts. < / span>

Gold layer guarantee - It is possible to verify the quality of the gold layer using an X-ray catalyst. The customer will then receive a detailed report with the results of the inspection and the measured gold layers.

The gilding process on the AURUNA 556 line

Degrease and nickel-plated parts - Parts are degreased first. Subsequently, a layer of nickel is applied, which has a thickness between 10 - 15 μm. This process increases the adhesion of Au and reduces the porosity of the surface.

Gilding - Gilding is done by electroplating the Au layer. The layer thickness is between 0.2 μm and 10 μm.

Rinse and dry - Rinses follow each step. After the final rinsing, the parts will be dried.

Spectrometer analysis - For each batch, the Au layer on 1 part is checked at a minimum of 3 points. The analysis is performed using a hand-held DELTA analyzer with a built-in X-ray lamp for material identification of metals and alloys. This is a fast, accurate and non-destructive analysis of the Au layer.

Varnish with baking varnish - Parts up to 1 μm Au are only varnished. With a larger layer, gold has the ability to protect itself, so this step is not necessary. The varnish burns at 130 ℃.

Highest purity and hardness according to US standards

Properties of the PCL gold plating line

  • AURUNA 556

  • Color (shade):

    Comparable to the original PCL

  • Purity Au:

    99,90 %

  • Purity Au:
    24 carats
  • Density Au:

    19 g/cm3

  • Alloying element:

    NO

  • Hardness in HV:

    250

  • Max. thickness of applied layer:

    10 μm

  • Dimensions (L x D x W):

    1500 x 1100 x 300 mm

Hardness - comparison between HK and HV_ 201 HK = 188 HV

Purity Au - 1 carat = 1/24 weight fraction of gold, the purity of pure Au is therefore defined as 24 carats

US Standard ASTM B 488

  • Class

    Purity (AU ratio in%)

  • I.

    99,70

  • II.

    99,00

  • III.

    99,90

  • Class

    Hardness in HK

  • A

    Max. 90

  • B

    91 - 129

  • C

    130 - 200

  • D

    201 +

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