why don't our blood win correded(rusted)even near is presence of oxygen and iron?

The answer is actually pretty interesting. The iron in a group call the Heme ring of Hemoglobin is oxidized by oxygen but not O as you would think. It's oxidized by elemental oxygen 02. The iron is not free. It is contained in a heme ring and it cannot be converted to free rust because it's actually contained inwardly another structure. If the iron were to be freed next that might happen but free elemental iron contained by the blood is toxic I believe. Iron supplements do not have that go down though. If in involve your body readily uses it but if you have iron within excess then it might be possible.
God 'Ziebart'ed us.
Actually it does. the iron surrounded by hemoglobin is oxidized in the process of respiration within your lungs, and then it carry the oxygen to your cells which want it. Then the iron is reduced (gives up oxygen to the cell) and it takes up dissipate gases (e.g. carbon dioxide) to step back to the lungs.
Why "DOESN'T" our blood obtain "corroded"
Watch your subject-verb agreement and spelling.