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Micro FTIR analysis was performed to the point with a 50-80 lm spatial resolution to verify the exact structure of a new blend thermoplastic powder coating film. Resistance to certain artificially accelerated conditions and actual outdoor exposure were examined to confirm the performance of the film as a protective coating for use in the telecommunication field. The new blend powder coating film consists of primary polyethylene terephthalate (PET) and secondary polyvinyl butyral (PVB) resins, and has a distinct dual phase structure. Specifically, it forms a continuous PVB phase in a surface layer with a thickness of approximately 100-150 lm. Good corrosion resistance was confirmed in artificially accelerated testing using salt water spray, heat cycle, and accelerated UV tests. Actual outdoor exposure in a metropolitan area (Shinkiba in Tokyo) and a coastal area (Miyake Island) revealed good weathering performance throughout the study period.

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It may be possible to estimate the hydrogen embrittlement process by statistically analyzing the fracture time of high strength steel. In this study, we derived transition probability λ t representing the degradation rate by statistically analyzing the fracture time of high strength steel using a stochastic process model. The analysis revealed that λ t decreased rapidly after the start of the test and then became a constant value. This behavior differs from general hydrogen entr y behavior, suggesting that the fracture time of high strength steel is not uniquely determined only by the amount of hydrogen in the specimen.