2016 Volume 65 Issue 11 Pages 450-453
As one of anti-corrosion system for marine steel structures, there is a method using calcareous deposits from mineral ions in seawater. In this process, chemical compositions and temperature of seawater around the structures have influence on the process, quality of deposits coating in principle. So we had some experiments under actual environment in Singapore, then we investigated relationship between the applicability, anti-corrosive performance and environmental factors by comparing the results with ones in Japan. Consequently, in Singapore, chemical composition of calcareous deposits coating was different from one in Japan. But the growth rate and anti-corrosive performance of calcareous deposits coating were the same as ones in Japan, although the concentration of mineral ions and pH of seawater around test site were lower than ones in Japan. Moreover with cathodic protection, the anti-corrosive performance was maintained during experiments. These results mean that anti-corrosion system using calcareous deposits coating is effective in low tidal current speed even if water quality around structure is changed in some extent.