different types of metal finishes to prevent rust and damage explaining each one

IS THERE ANYMORE INFO?....if there is pease tell me and i wil try to help you..

AFTER A PERIOD OF TIME MANY METALS CAN RUST OR GET DAMAGED TO STOP THIS HAPPENING WE CAN APPLY A FINISH HAVE TO LIST FOUR DIFFERENT TYPES OF FINISHES FOR METALS AND EXPLAIN EACH ONE

why is technlology importan?

can you please tell me types of metal and about them

thanks