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Electroless nickel plating over babbitt alloy
++++++I need do this electrodeposition. But I don't know if this alloy is autocatalytic with respect to nickel.
L. Medeirosbrass products - Belo Horizonte, Minas Gerais, Brazil
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Babbitt is an antique bearing surface, but it still has applications where it is the one of choice. If you EN over the top of it you are going to kill almost all of the reason for using it. Bad choice from my distant perspective. - Navarre, Florida |
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Babbitt metal can be anything between 90% Pb and 90% Sn, with Sb and Cu. None of these metals are catalytic to regular acid or neutral EN plating solutions and will also poison them.
However, there is an ammoniacal, nickel sulfamate and pyrophosphate based solution, that operates at pH 10 and 185F that will plate directly on babbitt metal, at least as a tie coat before regular EN.
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Ed. note: It is our sad duty to alert the readers to the passing of Ron Duncan on Dec. 15, 2006. For those who would like to know more about him, a brief obituary opened Update No. 13 of our Metal Finishing Industry Update Podcast. |
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You need a Nickel Strike layer prior to the EN.
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