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Corrosion for nickel plated material



October 5, 2008

Hi dear sir recently we are facing the corrosion problem for C12L14 alloy , basically we are coating this alloy with EN plating but recently fond the corrosion after En(Electro Nickel) plating using potassium ferri cyanide test(solution contain potassium ferri cyanide + NaCl).
So I would like to ask you whether potassium ferri cyanide can react with nickel or chloro compound can react with nickel ?
what are the possible ways to cause this corrosion?
how to carry the adhesion test of C12L14 material VS Electro nickel plating.

Akula Jagadesh
Sr.Chemist - Singapore



October 8, 2008

The test you describe is for porosity. examine the item before plating. If it has a porous surface, take steps to reduce or eliminate the pores. Monitor the cleaning process to be sure the item is chemically clean. If you etch in the preparation cycle,reduce or eliminate etching. It is also possible to have an electroless nickel plating solution produce porosity. Check for metallic impurities, organic contamination.

don baudrand
Don Baudrand
Consultant - Poulsbo, Washington
(Don is co-author of "Plating on Plastics" [affil link to the book on: Amazon or AbeBooks ])


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