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Long term surface conductivity of bright chrome vs. bright nickel over 430 BA stainless steel

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I am aware that when new, a bright electrolytic nickel plate has more surface conductivity than a bright chrome plating. In a coastal setting, however, what are the long term differences between the two?

For example, if these products were to be pre-plated over a 430 stainless steel in a reel to reel plating operation, which of the plated materials would fair better over 5 years in an evironment similar to an indoor, but airy, Miami, FL or San Diego, CA residence or business.

The material, 430 bright annealed stainless steel, was chosen for its magnetic qualities, corrosion resistance, cosmetic appearance, material cost and overall commercial availability. The plating is intended to enhance the appearance of the part and maintain a consistently conductive surface.

I believe that the nickel plating will initially have great surface conductivity properties, but in time and in these environments, the nickel plating will oxidize greatly and become less conductive than the chrome plating. Is this true?

Dan Hoekstra
Vice President of Design - Lafayette, Colorado

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