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Research on Photo-degradation Behavior of E-coat

Article of Honda R&D Technical Review Vol.25 No.2


An automotive paint process that remove the primer process has been developed in order to reduce the energy consumption and CO2 emissions. An analysis method of the photo-degradation of the E-coat when the primer is removed was established, based on the changes in physical properties and chemical structures. As a result, the range of wavelength that cause peeling potential is under 550 nm. Based on these results, a layer to shield under 550 nm of light (1 base) was applied before the color development layer (2 base) without the drying process, enabling elimination of the primer process without limitation to color development.


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Author (organization or company)

Keisuke KOJIMA(Automobile R&D Center)、Takamasa AOKI(Automobile R&D Center)、Takeshi OGAWA(Automobile R&D Center)

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