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Corrosion resistance - electroless nickel versus sulfamate nickel


For equal deposit thicknesses over carbon steel, which is the preferred method. We would like to keep the deposit thickness under .0002 to minimize dimensional influences.
Thanks in advance for your help.

Frank O'Donnell

First of two simultaneous responses -- 2006

Two tenths of either will not give a significant corrosion protection in anything short of an air conditioned climate. EN will be better because it will be uniform and more controllable than electrodeposited. It will cost more.

James Watts
Navarre, Florida

Second of two simultaneous responses -- 2006

Neither method will give you very much for two tenths. Nickel as well as nickel + phosphorous are cathodic to carbon steel which means that in order to protect the base metal, both coatings will have to be absolutely impervious. Of course that depends on your specific situation.

Guillermo Marrufo


Frank, to answer your question correctly will require a little more information about the expected result. In other words, corrosion resistance to what. How is performance to be measured (salt fog or something).

Generally, EN will provide better corrosion resistance than sulfamate nickel in most applications.

Ron Duncan
Ron Duncan [deceased]
- LaVergne, Tennessee
It is our sad duty to note Ron's passing on Dec. 15, 2006. A brief obituary opens Episode 13 of our Podcast.

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