海洋構造物用エポキシ系防食塗膜の初期劣化

概要

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The early stage deterioration 0L anti-corrosive epoxy coating for offshore structure use was discussed theoretically and experimentally. The degree of deterioration was determined by the critical strain measured at the three-point bending of coated test specimen exposed to the marine environment. The relation between this critical strain ε_c and the detached area S and the deflection at cracking δ_c of the coating at the three-point bending was theoretically calculated and it showed fairly good agreement with experimental data. Based on the assumption about ε_c mentioned above and also on the assumption that the deterioration velocity of coating obeyed to the usual thermo-chemical reaction velocity law, the accelerating effect of several kinds of accelerated deterioration test methods were evaluated quantitatively. Final]y the deterioration phenomena of epoxy coating in an early stage was schematically shown for the changes of critical strain, volume resistivity and alternating current resistance against the exposed period.
社団法人日本船舶海洋工学会の論文