ABSTRACT

Corrosion-induced degradation in marine steel structures is highly dependent on the surrounding environmental conditions and sea water compositions that varies significantly around global sea water bodies. This research investigates the corrosion behaviour of ship-grade steels exposed under different sea water compositions and environmental conditions typical of the Arabian Sea. More, environmental conditions spanning those anticipated for the shipping structures operating in the highly saline and warmest regions in the Arabian Sea have been simulated in laboratory-based experiments by using heated and aerated artificial sea water. Following their exposures, the corrosion performance of coupons has been investigated using the standard weight loss and a new dimensional metrology-based approach. Besides, the corrosion products formed on the steel surfaces have been characterised using various analytical techniques. Considerably higher corrosion losses and maximum corrosion depths were observed in the nutrient-rich polluted sea waters than those recorded in the natural sea waters, as well as in the simulated artificial sea water conditions.

摘要

海洋钢结构的腐蚀引起的降解高度依赖于周围的环境条件和海水成分，这些成分在全球海水体周围变化很大。这项研究调查了暴露在不同海水成分和阿拉伯海典型环境条件下的船舶级钢的腐蚀行为。此外，在实验室实验中，使用加热和充气的人造海水模拟了在阿拉伯海高盐度和最温暖地区运行的航运结构的预期环境条件。在暴露之后，使用标准重量损失和新的基于尺寸计量的方法研究了试样的腐蚀性能。除了，钢表面形成的腐蚀产物已使用各种分析技术进行了表征。在营养丰富的受污染海水中观察到的腐蚀损失和最大腐蚀深度比在天然海水和模拟人工海水条件中记录的要高得多。