The 2300 year old Iron Pillar in Delhi (India) has no special coating and yet no rusting takes place. Researches are on to find out how it was built.
The Eiffel Tower of Paris, on the other hand, is hardly 83 years old and needs great deal of research maintaining to prevent from rusting.
The old technology and modern technology can be clearly differentiated here.
Wonder, is this the reason, that they say,”OLD IS GOLD”!!!