Study on corrosion degradation of wire ropes in sea water

T. Moriya, S. Hara, K. Yamakawa, K. Hayasaki, S. Okahata, R. Kanbe
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引用次数: 3

Abstract

Wire ropes used in marine environment have a great degradation due to corrosion. Accurate inspection methods for corrosion of wire ropes are necessary to ensure their safety. However, technical background data of corrosion is quite few at present, and is not sufficient for wire rope inspection. Collecting the technical data is important to establish and ensure the offshore structure's maintenance technology including wire rope inspection. A laboratory test of wire ropes degradation was carried out with seawater tanks for 5 years since 1994 to 1999. 14 kinds of ropes were used for the experiment. Further, an exposure test in real sea area was also carried out for 11 months in 1997 to acquire degradation data in dry zone above sea level, in ebb zone, and in the seawater zone. Eight kinds of ropes and 3 kinds of wires were used for the exposure test. During the test period, we examined the ropes for several times on the following characteristics. (1) appearance of ropes and strands, (2) cross section of each wire layers, (3) properties of wire: diameter, tensile strength, number of torsion, (4) mass of coating. The changes of characteristic values were approximated in the curve to eliminate fluctuation errors. We calculated the most suitable characteristics values when the experiment was finished and converted into normalized values divided by initial values. Corrosion degradation of some kinds of wire ropes was evaluated with normalized characteristics values, and appearance of their surface and their cross section.
钢丝绳在海水中的腐蚀降解研究
在海洋环境中使用的钢丝绳由于腐蚀而退化严重。准确的钢丝绳腐蚀检测方法是保证钢丝绳安全的必要条件。然而,目前有关腐蚀的技术背景资料很少,对钢丝绳的检测还不够充分。收集技术数据对于建立和保证海上结构物的维护技术至关重要,其中包括钢丝绳检查。由一九九四年至一九九九年进行为期五年的海水水箱钢丝绳退化试验。实验共使用了14种绳索。此外,1997年还在实际海域进行了为期11个月的暴露试验,获得了海平面以上干燥区、退潮区和海水区的退化数据。暴露试验使用了8种绳索和3种钢丝。在测试期间,我们对绳索进行了多次测试,测试结果如下:(1)绳索和股的外观,(2)每层钢丝的横截面,(3)钢丝的性能:直径、抗拉强度、扭转次数,(4)镀层质量。在曲线中近似特征值的变化,消除了波动误差。实验结束后,我们计算出最合适的特征值,并将其转换为归一化值除以初始值。采用归一化特征值、表面形貌和截面形貌对几种钢丝绳的腐蚀退化进行了评价。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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