A STUDY ON CORROSION OF PAINT-COATED STEEL WITH DEFECTS IN MARINE ENVIRONMENT
A STUDY ON CORROSION OF PAINT-COATED STEEL WITH DEFECTS IN MARINE ENVIRONMENT
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海洋环境中缺陷涂漆钢的腐蚀研究
DOI：
10.2208/jsceje.63.667
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发表时间：
2007
期刊：
影响因子：
--
通讯作者：
T. Nishida
中科院分区：
文献类型：
--
作者：
N. Otsuki;Aung Kyaw Min;M. Madlangbayan;T. Nishida
本文介绍了在模拟海洋环境的实验室条件和现场条件下对带缺陷的涂漆钢板的腐蚀进行了实验室研究的结果。首先，实验定性证据表明，用于测量每个电位和大胞电流的分隔钢板与未分隔钢板之间的极化行为具有显著的相似性。然后在不同的暴露环境和温度下，对带有缺陷的涂漆钢板进行了大细胞和微细胞腐蚀监测。最后，对现场现有涂漆钢结构的腐蚀速率进行了估计。结果表明：钢板分割后的电化学测量值与未分割钢板的电化学测量值基本相同，且趋势一致。涂漆部分与钢板缺陷部分之间发生了大细胞腐蚀。高供氧和高温的暴露条件，为缺陷涂层钢提供了最恶劣的腐蚀环境。此外，还成功估算了现场现有钢结构的腐蚀速率。
This paper presents the results of the laboratory investigations on the corrosion of paint-coated steel plates with defects under laboratory conditions of simulated marine environment and in the field. First, experimental qualitative evidence showing significant similarity of the polarization behavior between divided, which were used for measurement of each potential and macrocell current, and undivided steel plates was established. Macrocell and microcell corrosion were then monitored in paint-coated steel plates with defects under different exposure situations and temperatures. Lastly, corrosion rates in an existing paint coated steel structure in the field were estimated. Results show that values of electrochemical measurements in divided steel plates are almost the same and showed the same trend as the undivided steel plate. Macrocell corrosion occurred between the painted part and the defect part of the steel plates. The exposure condition where high oxygen supply and high temperature exist, provided the most severe environment for corrosion of paint coated steel with defect. Moreover, corrosion rates in an existing steel structure in the field were successfully estimated.