Naoki KOBAYASHI

Study on the Corrosion Factor and the Corrosion Prevention of the Steel Plate in the Landfill Sites Using the Steel Plate Liner

Toshiya KOMATSU, Shuji HIMENO and Shoichi FUJITA

In the new type landfill site system using the steel plate liner, cathodic protection, heavy duty coating and corrosion margin will be used as corrosion prevention methods of steel plates. Corrosion margin should be adopted as a backup prevention method and it is necessary to measure the corrosion rate of steel plate to determine the corrosion margin. In this study, the corrosion rate of an unpainted steel plate in waste was measured and the performance of cathodic protection and various types of heavy duty coating was checked by landfill site exposure examinations. The results showed that both cathodic protection and heavy duty coating were effective for preventing corrosion in waste. The laboratory corrosion examinations for investigating the influence of pH, chloride ion, and dissolved oxygen (DO) were also conducted, because these factors seemed to play important roles in corrosion. It was suggested that DO in water which touches to steel plate has the most significant influence on corrosion.