Need to know two things to help you:
1. What is material of your fixture
2. Which kind of coating exists on fixtures (if any)
Controlled atmosphere will not help by itself. Even slightest amount of humidity is sufficiant to cause corrosion. Theory even says that corrosion is developing more in low humidity-atmosphere (if you put metal in pure water, most corrosion will exist on border zone, not in the water - talking about water without salinity).
If you store ordinary low-carbon construction steel without any protection - try with commercial "primers". You can buy primer and cleaner together: apply primer during storage, clean with cleaner before use. There is also possibility to simply add layers of other coating compactible with primer. Chemical stores related to construction supplies know everything about that.