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Sherardising

Process of galvanization of ferrous metal surfaces

Summary

Process of galvanization of ferrous metal surfaces

Sherardising or Zinc thermal diffusion is a process of galvanization of ferrous metal surfaces, also called vapour galvanising and dry galvanizing. The process is named after British metallurgist Sherard Osborn Cowper-Coles (son of naval inventor Cowper Phipps Coles) who invented and patented the method c. 1900.{{ cite patent

Sherardising is ideal for small parts and parts that require coating of inner surfaces, such as batches of small items. Part size is limited by drum size. It is reported that pipes up to 6 m in length for the oil industry are sherardised. If the metal surface is free of scale or oxides, no pretreatment is needed. The process is hydrogen-free, hence hydrogen embrittlement is prevented.

Application

During and shortly after World War I, German 5 pfennig and 10 pfennig coins were sherardised.

Standards

  • ISO 17668:2016 (replaced BS EN 13811:2003): Sherardizing. Zinc diffusion coatings on ferrous products. Specification
  • ISO 14713-3:2017: Zinc coatings. Guidelines and recommendations for the protection against corrosion of iron and steel in structures. Part 3. Sherardizing

References

sk:Zinkovanie

References

  1. Porter, Frank C.. (1991). "Zinc Handbook". CRC Press.
  2. H. G. Arlt, "Finishes on the Metal Parts of Telephone Apparatus", ''Bell Laboratories Record'', Volume 9(4), 175 (December 1932)
Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

chemical-processes corrosion-prevention metal-plating zinc
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