Clarification of the corrosion mechanism of polymeric materials and establishment of designing principle for corrosion-resistant composites

1)物理退化区域2)环境液体渗入区域3)化学退化区域在此基础上讨论了防腐FRP体系的设计指南。第一年，尽管用显微-FTIR进行了深入的观察，但由于表面的所有腐蚀产物都已溶解到溶液中，细节评价不能成功。这一行为是由于填充颗粒的意外高填充效应造成的。第二年，通过改变填料颗粒的形状、加载量和粒径，研究了基质树脂(EP)链长、表面形成腐蚀层的腐蚀成层型树脂的微观腐蚀机理，角状颗粒的腐蚀速率高于球形颗粒，高体积分数的腐蚀速率高于低体积分数的树脂。颗粒直径对腐蚀速率几乎没有影响。综上所述，基于第一年提出的体视学模型的复合材料腐蚀机理即使对于腐蚀成层型腐蚀也是适用的。

The key points of this research were clarification of following behaviors paying attention to the front of corroded layer and the interface of second phase (glass fiber, filler) in composite materials.1) physically degraded region2) region where the environmental liquid was penetrated3) chemically degraded regionBased on these results, designing manual for anti-corrosion FRP system was discussed.In first year, in spite of advanced observation with microscopic-FTIR, detail evaluation cannot succeed because all corrosion products on the surface have dissolved into solution. This behavior was due to unexpected high filling effect of filled particles. The effect of filler on corrosion mechanism of particle-filled composites, however, can roughly clarify based on the role of penetrated liquid around the filler.In second year, the microscopic mechanism of corrosion for corrosion-layer-forming type resin, in which the matrix resin (EP) has a long chain and the corrosion layer was formed on surface, has been investigated with varying the shape, loading amount and diameter of filler particles.The corrosion rate was higher for angular particle than spherical one, and for high volume content than low one. And almost no effects of particle diameter on corrosion rate were observed.In conclusion, corrosion mechanism of composites based on stereological model which was proposed in the first year was applicable even for corrosion-layer-forming type corrosion.