目的 研究干湿交替海水环境对碳钢腐蚀速率的影响。方法 以青岛小麦岛海域海水为试验介质，使用周期间浸设备，以60 min为一个循环，在浸没/干燥时间分别为10 min/50 min、20 min/40 min、30 min/ 30 min三种不同干湿比的干湿交替条件下，对碳钢试片和电化学试样分别试验3、7、14、21、28 d后取出。通过失重法和电化学测试方法，研究了腐蚀速率的变化情况，使用X射线衍射仪（XRD）、能量色散谱仪（EDS）和扫描电子显微镜（SEM）分别研究了腐蚀产物成分、腐蚀产物形貌和除锈后的腐蚀形貌。结果 失重法和电化学方法表明，碳钢在三种干湿比条件下的腐蚀速率为全浸条件下的3~8倍，且碳钢的腐蚀速率随着干湿比的增大而增大，但是增大的幅度越来越小。随着干湿比的增大，碳钢表面生成的锈层变薄，腐蚀产物中γ-FOOH和氧的含量升高，Fe3O4的含量降低。结论 干湿交替环境的干湿比越大，对碳钢腐蚀的加速作用越显著，且这一加速作用存在极大值。

The work aims to study the effect of dry-wet alternating seawater on corrosion rate of carbon steel. Taking seawater from Xiaomai Island in Qingdao as the test medium, carbon steel specimens and electrochemical specimens were tested for 3, 7, 14, 21 and 28 d respectively by alternating immersion equipment with 60 min as a cycle under the dry-wet alternating conditions of immersion/drying time for 10 min/50 min, 20 min/40 min and 30 min/30 min using weekly immersion equipment and then taken out. The change of corrosion rate was studied by weight loss method and electrochemical test method. The components and morphology of corrosion products and the corrosion morphology after removal of corrosion products were studied by X-ray diffraction (XRD), energy dispersion X-ray spectroscopy (EDS) and scanning electron microscopy (SEM). The corrosion rate of carbon steel under alternating dry-wet conditions with three dry-wet ratios was 3~8 times of that under whole immersion condition, and the corrosion rate increased with the increase of dry-wet ratio, but the increase gradually became smaller. With the increase of the dry-wet ratio, the thickness of the rust formed became thinner and the content of γ-FeOOH and oxygen in the rust layer increased while the content of Fe3O4 decreased. The corrosion rate of carbon steel increases with the increase of dry-wet ratio, and the acceleration effect has a maximum value.