Cylinder Design Glossary

Micro Crack Chrome Plating

Almost all electroplated hard chromium deposits contain 'micro cracks'. The number of 'micro-cracks' present in a given surface area will affect the coating properties of chrome plating.

Cracking occurs during the plating process when internal stress exceeds the tensile strength of the chromium. The number and size (width and depth)  of these micro-cracks can vary a great deal and is influenced by the following:

  • the surface condition of the substrate
  • the type of plating chemistrythat is used
  • the concentration chromic acid
  • the type and concentration of the catalyst
  • the ratio of chromium to catalyst 
  • the density of the plating current density
  • the bath temperature
  • the presence and concentration of any bath impurities
  • the thickness of the chromium deposit

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