Chemically, the only easy way to solder to nickel is to use a flux with 
high levels of organic or inorganic halide activators. Ideally, I 
recommend a strong OA flux such as Alpha 3355-11 which has a glutamic 
acid hydrochloride activator. Post-soldering washing is mandatory.

Brian

On 29.08.2013 21:52, Victor Hernandez wrote:
> Fellow TechNetters:
>
>     Should I be concern with an electroless matted nickel plating over an aluminum sheet metal surface and solder onto a copper heat tube?   I recall something about directly soldering onto a nickel surface.  Beside nickel oxidation.    Any suggestions would be greatly appreciated.
>
> Victor,
>
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