Re: Nickel Corrosion

> John:
> 
> Since corrosion is the reaction of a material with its environment,
> and you didn't specify an environment, you have actually asked half of
> a question. So, here is half of an answer.
> 
> Nickel is more noble than iron, and less noble than copper. It forms a
> passive film (of oxides or hydroxides) in some neutral or alkaline
> environments. Pure nickel is an excellent material for handling hot
> concentrated caustic soda (sodium hydroxide), as has been discussed
> previously on this newsgroup.
> 
> Even in air nickel may not stay bright, since it can form a "fog"
> (thin layer of nickel sulfate).  In stagnant seawater nickel can pit. 
> Artificial sweat (for tests) also will corrode it.
> 
> Nickel alloys containing combinations of chromium and molybdenum are
> quite resistant to a wide variety of corrosive environments. Loads of
> information may be found from the Nickel Development Institute
> (website www.NiDI.org) who also have lots about stainless steels.
> 
> 
> Pittsburgh Pete

Pete-
What if your environment is deionized water, say in the range of 1 to
5 meg-ohm/cm?  Will Nickel corrode?  What if it is even more pure?

Craig