Surface Treatment: Pickling, Etching and Electroplating of Metal Surfaces

Metal treatment processes start with degreasing steps mainly carried out with alkaline agents. Afterwards, during the metal pickling step, the corrosion film and other impurities on the surface are removed.

Pickling additives

Deposition processes in metal working can frequently lead to undesirable precipitation. This can be inhibited by highly soluble Citrates and Tartrates. In addition, these products accelerate the deposition process and ensure that other metal ions remain sufficiently stable. Iron-based Lohtragon^® metal salts for the production of pickling solutions (Sulfates) and dyes for aluminium baths (Oxalates) complete our portfolio in this field.

Aluminium etching

The alkaline degreasing step of Aluminium often leaves surface deposits. These need to be removed as they will negatively affect the uniform bonding or coating. Lohtragon^® Ferric or Copper Sulfates are typically used in etching formulations prior to the coating process.

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Electroplating processes are used to functionalize metal and non-metal surfaces for enhanced corrosion protection, decorative appeal, wear resistance, hardness, solderability, electrical and thermal conductivity, oil retention and ease of cleaning. Within the multistep electroplating process, the deposition process can be electrolytic currentless. Electroplating bathes contain Lohtragon^® high performance metal salts for pH control, as buffer and complexing agent as well as a high purity metal source (Zinc, Iron).

For further information please download our Lohtragon^® Info Sheet Surface Treatment.

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Solid lubricants such as Pyrophosphates are used to alter the tribological properties of metal surfaces. This is either used to produce detachable adhesive bonds or to prevent metal surfaces from “sticking” together. Further information see lubricants.

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