Due to its relative high sensitivity to precipitation acidity and environmental humidity, the corrosion rate of zinc at TSP was a little higher than that at GYQ.

Prestressed steel wire and strand for bridge are used in the condition of high alternating stress with humidity atmosphere and sometime seawater atmosphere, which speed up the corrosion.

The influences of temperature, relative humidity ( RH ) and the salt deposit on atmospheric corrosivity were investigated by means of corrosion detective cells.