Don't worry about it, I have some couplers with that "powder" that are many years old and have no problems at all.

Later Gator,

  Dave

 

Here comes a Yankee with a blackened soul,
Heading to Gatow with a load of coal.
......Anonymous U. S. pilot during the Berlin Airlift

Depending on how old the couplers are and where they have  been stored, it might be powdery mildew.  No big deal,  just give them a washing with a disinfectant cleaner (no bleach,  it might etch the metal) or spray/dip them in alcohol to kill the mildew. 

 

There's no scale but O scale

CEO Overbeider Iron and Steel Company,  Crapton division 

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