Question

The body of the Mars Orbiter needs to be made up of a special material in order to avoid rusting of the parts and overheating of the surface.

Answer 1

the special material is 
     Aluminum and Composite Fibre Reinforced Plastic -  or,
           Carbon Fiber Reinforced Polymer -  CFPR

 CFPR -  has a very high strength for a given weight
         - reflects heat
           -  does not rust
             - durable