Abstract
Network polymers are used for various corrosion protection applications because of their excellent corrosion resistance. Although there are many resins actually used for corrosion protection, their characteristics differ significantly. Therefore, it is essential to determine in detail the corresponding corrosion factors under the applied environment in order to choose the most suitable resin and the appropriate construction method. For example, the corrosion degradation of concrete structures by the generation of sulfuric acid poses a problem in sewer environment, and therefore, resin linings have been used as anti-corrosive protection. In this study, an actual long-term in-situ examination was performed using about 15 kinds of commercial resins, and a comparative test was also performed through weight and intensity measurements to establish an ultimate analysis of their corrosion degradation behavior under sulfuric acid environment. The obtained results indicated that even though the corrosion behavior varies with the kind of resins applied, it can be roughly classified into three types. For the epoxy resin, in which high permeation of sulfuric acid proceeds more readily than that of water, the permeation of sulfuric acid into the resin was found to proceed stepwise, and it was also clearly shown that over the long period, the penetration depth increased in proportion to the square root of time. Using this method, the life prediction of a lining system can be attained.
