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corrosion between hard ferrite and zinc coating

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fabian64

Automotive
Joined
Jan 3, 2009
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1
Hi,

I have a pb of corrosion on magnetic catches :
- white corrosion is located between ferrite and pole pieces of magnetic catches
- poles pieces are electro zinc coated mild steel
- pole pieces are in contact with hard ferrite
- outdoot use, exposed to atmospghere humidity but no direct rain
there is white rust on the contact zone (ferrite and zinc coated pole pieces) after 3 days outside
but not rust if zinc coated pole pieces are exposed outside alone
What is the corrosion mecanism with ferrite ?
Any idea to avoid that corrosion pb ?
please help !!
 
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