Letter 36041

Porosity and hard chromium [France] 

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I make a porosity ferroxil test (potassium fericyanide + potassium ferrocyanide + NaCl) on a hard chromium plated tube.
I have 2 results :one part have less porosity than the other
Could you give me the factors in the process of hard chromium wich affect the porosity
Characteristics : hard chromium Thickness 20µm

BLOUINEAU
DELPHI - TREMBLAY, FRANCE

At that thickness, hard chrome should easily pass your ferroxyl test. One possibility is excessively rough surface prior to plating. Others are improper mechanical finish after plating, or gas pitting due to poor agitation.

Jeffrey Holmes, CEF - Spartanburg, SC, USA

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