目的 针对我国南海海域使用过的六种材质隔水导管，系统性地分析其在60、90、180 d三个腐蚀周期及在大气区、飞溅区、潮差区、全浸区四个区带的腐蚀行为与腐蚀规律，为我国南海隔水导管材质优选提供理论依据。方法 首先，开展室内实验模拟海洋腐蚀环境，通过SEM扫描分析隔水导管在大气区、飞溅区、潮差区及全浸区的腐蚀特点，并针对六种材质挂片在四个区带的腐蚀速率开展研究，最后基于动电位极化与电化学阻抗技术分析隔水导管的抗腐蚀性能。结果 飞溅区与潮差区的腐蚀程度相比大气区及全浸区更严重，且飞溅区、潮差区及全浸区三个区带的腐蚀产物主要为γ-FeO(OH)；180 d时大气区平均腐蚀速率约0.0651~0.0976 mm/a，飞溅区约0.3924~0.4857 mm/a，潮差区约0.3482~0.4281 mm/a，全浸区约0.1714~ 0.2109 mm/a。六种材料容抗弧大小为X80< X70< X65< X60

The work aims to systematically analyze the corrosion behavior and law of six different kinds of materials at four corrosion zones (atmospheric zone, splash zone, tide zone, and full immersion zone) and in three corrosion cycles (60 d, 90 d, and 180 d) so as to provide theoretical basis for the future material optimization of conductor in the South China Sea. Firstly, indoor immersion tests were carried out to simulate marine corrosion environment, and analyze the corrosion behavior of conductor at atmospheric zone, splash zone, tide zone and full immersion zone respectively by SEM scanning the corrosion coupons. Secondly, the corrosion rate of the six materials at four corrosion zones was studied and finally, the corrosion resistance of the six materials was investigated by potential polarization, and electrochemical impedance techniques. The corrosion forms of coupons were mainly general corrosion. The corrosion degree at the splash zone and the tide zone was more serious than that at the atmospheric zone and the full immersion zone, and the corrosion products of the splash zone, tide zone and full immersion zone were mainly γ-FeO(OH). After testing for 180 d, the corrosion rate at atmospheric zone was 0.0651~0.0976 mm/a, 0.3924~0.4857 mm/a at splash zone, 0.3070~0.3783 mm/a at tide zone, and 0.1714~0.2109 mm/a at full immersion zone. The size relationship of condensance arc of the six materials was X80< X70< X65< X60< X56< X52. From the polarization curves, the higher the degree of steel is, the greater the density of corrosion current and the faster the corrosion rate will be. Under the experimental conditions, the conductor corrosion forms of South China Sea are mainly corrosion and oxygen corrosion, and the conductor coupons of X52 material have a slower corrosion rate and are stronger on corrosion resistance than X80 material.