Two commercial coating systems applied to aluminum alloy screw connections exposed naturally in atropical oceanic atmospheric environment were studied. The degradation process after differentexposure times was analyzed by a series of test methods: visual appearance, color change, gloss loss,Surface FTIR and EIS. Our experimental results indicated that for the screw connection structure, thejoint area was not only more susceptible to corrosion, but also increased the inconsistency of the flatarea nearby. The protective ability of coating system 1 was superior to that of coating system 2. Theeffective protective time of coating system 1 was about two years, while the coating system 2 was lessthan one year.
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