Being known to be a fisherman, Received a tackle tray full of salt water spoon and hooks from a friend(it was from his passed uncle), They are very nice but rusty, Tried  WD40 on the treble hook but it didn't work as you can see in the pictures. Do you have any idea how can I fix them without effecting the hardness of them?

I would say a little scrub with, in order, Barkeepers Friend, Magic Eraser, very fine steel wool, and/or a fine wire wheel if none of the above work. I think the fine steel wool is your best bet to get the rust without doing real damage to finishes if you are careful.

Be very careful if you use a wire wheel, it can catch and throw the hook in your face.  Don't ask how I know.

a dremmel and a brass wire wheel will clean up the surface.  Like Alex says, make sure you're using the side of the wheel that is going away from you.  For the hook but also because it is going to fling bristles.  Then touch up the points with a file later. 

@bulldog1935 what's your advice in this situation? 

Soak them in C (calcium) L (lime) R (rust) then a light brush with a soft scotchbrite pad. Rinse well and dry.

As the name implies CLR dissolves rust.

 

 

Nice Zara Spook - remove the eye screws and hooks - don't dip the lure in anything - any cleaning formulation will strip the remaining finish.  

Treating the brass spoons with hooks attached per below is fine.  If they come out pink instead of yellow, you can polish the pink away w/ metal polish.  

 

If you want to clean the hooks for display, vinegar bath - 3+-hour soak in household vinegar + 3 parts warm water (finger-touch warm) - I keep it warm on a hot plate (turning a glass stove top warm and off) for 3 hours, and take a toothbrush to them frequently.  Follow with soap/water rinses and air dry.  

 

Unlikely that the metal is tough enough to fish again, and if you want to use the lures, hooks, split rings and eye-screws likely should be replaced.  

 

There's more than rust - hydrochloric acid results from further oxidation, and causes stress corrosion/ hydrogen cracking of the hardened steel.  Even if you clean them, they'll likely break when you need them - inside, they're possibly already riddled with micro cracks that you can't see.  

 

I use Evapo-Rust for old car parts and rusty tools.  It works wonders.  Let your rusty everything soak overnight, rinse with water, dry, and wire wheel/brush them off.  They'll look new.  I buy it at Harbor Freight Tools.

 

https://www.evapo-rust.com/rust-remover-crc/

1 hour ago, DogBone_384 said:

I use Evapo-Rust for old car parts and rusty tools.  It works wonders.  Let your rusty everything soak overnight, rinse with water, dry, and wire wheel/brush them off.  They'll look new.  I buy it at Harbor Freight Tools.

 

https://www.evapo-rust.com/rust-remover-crc/

Accepting the risk of possibly doing damage, my son and I used this to clean up several Civil War relics. The results were impressive.  I would hesitate to characterize them as being restored, but they cleaned up so well that he proudly displays them in his home. 

When I find old lures, I clean them up by scrubbing them with a bonze bristled toothbrush and dish soap. I've found that it works pretty good.

EvapoRust is the best thing for this.