(1) 中国科学院烟台海岸带研究所

In view of serious corrosion in typical coastal cities, taking Yantai as an example, we made a corrosion survey concerning the corrosion status of 40 bridges, 3 ports and wharfs, 12 municipal pipe network units, 13 industrial enterprises and 20 tourism and entertainment units in the city of Yantai by means of questionnaire survey and field survey. The data related with corrosion and protection status of 88 investigation objects were obtained, and it was found that the corrosion events were serious in various industrial fields of Yantai. The general status of corrosion issue in the city is seriously that, reinforced concrete structures all suffered from corrosion of diversified types, such as surface voids and pits, cracks, rust spots, exposed reinforcing bars, corrosion cracking and so on. Steel structures also suffered from corrosion of different severities, such as damages or thinning of protective coatings and corrosion induced leakage points etc. With the Hoar method, the annual corrosion cost of Yantai city was estimated to be 2,354,336.4 ten-thousand RMB, accounting for 3.9% of the national gross domestic product.