The corrosion behavior of weathering steel（09CuPCrNi）exposed in tropical marine environments for varied periods was investigated.The synergistic effect of exposure environment and alloying elements on weatherability was also studied.Mass loss method was used to evaluate the weatherability,while the rust layers formed on weathering steel under different conditions were examined by using Infrared spectroscopy（IR）,electron probe of mass analysis（EPMA）and electrochemical techniques.The results show that under low chloride deposition,the enrichment of Cr plays an important role in improving the weatherability;conversely chloride ion is primary factor to deteriorate the weatherability by high chloride deposition.
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