Building a bridge to Hong Kong, Macao and Zhuhai - in the perspective of engineering is to create artificial island ยมโดย the steel pipe to be the bottom of the sea and reclamation soil base is in the middle. To make the artificial island. When the time for long steel pipe used can rust from salinity of seawater to decay.
Solutions for steel pipe does not rust. By using electricity to make iron electric potential higher than nearby. Which will make the iron loss of electron and the rust.