通过一年的遮雨和未遮雨大气暴露试验，研究了纯铜在沈阳城市大气环境下的初期腐蚀行为。不同暴露环境下，纯铜的大气腐蚀速率、腐蚀产物组成及其保护性都存在差异。遮雨暴露条件下，纯铜的大气腐蚀速率较高，尤其在降雨较多的暴露期间，雨水冲刷使纯铜经历了更长的润湿周期而显著加速了纯铜的大气腐蚀。不同暴露条件下，纯铜表面形成的大气腐蚀产物主要组成为Cu2O，遮雨暴露条件下，腐蚀产物的其它组成为Cu4SO4(OH)6.H2O和(Cu4SO4(OH)6)；而未遮雨暴露条件下，雨水的冲刷溶解作用延缓了腐蚀产物的Cu4SO4(OH)6.H2O形成，因而在经历6个月暴露周期后，腐蚀产物仅含Cu2O，随着暴露周期延长，在经历12个月暴露后，逐渐有Cu4SO4(OH)6.H2O形成。未遮雨暴露条件下，纯铜表面形成了更厚、致密的腐蚀产物膜，其有效地抑制了大气腐蚀的阴极反应，具有更好的保护性。
Atmospheric corrosion of pure copper under sheltered and unsheltered exposure condition during 1 year period in Shenyang atmosphere was studied. Atmospheric corrosion rate of pure copper, composition and protectiveness of corrosion product of pure copper was different under the different exposure conditions. Corrosion rate of pure copper exposed to unsheltered condition was higher than that exposed to shelter. Especially during rainy season, runoff by rain made the copper experience the longer wet time, and thus accelerated corrosion of pure copper evidently. The main corrosion product of copper under the different exposure conditions was Cu2O, there were still Cu4SO4(OH)6.H2O and (Cu4SO4(OH)6) under shelter. However, effects of runoff and dissolution by rain on corrosion products made a low formation process of Cu4SO4(OH)6.H2O, only Cu2O was identified after 6 months exposure under unsheltered exposure condition, Cu4SO4(OH)6.H2O was not found until 12 months exposure period. The thicker and compact corrosion product film had been formed under the unsheltered exposure, which could inhibit the cathodic reaction of copper corrosion effectively, and thus had the better protectiveness.
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