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The marine corrosion of structural steels in brackish and fresh waters

机译：咸淡水中结构钢的海洋腐蚀

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High-quality models are required to describe the corrosion of structural steels in marine, brackish and fresh waters and these models should, preferably, be based on a proper understanding of the corrosion processes involved. The models should then be used to interpret field data, rather than attempting to derive models empirically from field data. On this basis a multi-phase corrosion - time model has been proposed previously for mild and low alloy steels subject to immersion in 'at-sea' conditions. This model is reviewed and extended to brackish and fresh waters in this paper. The scientific principles show that salinity is not the critical issue for the corrosiveness of water. Instead, the critical parameters are the temperature, pH and calcium carbonate solubility when corrosion is governed by oxidation. For later corrosion, governed by anaerobic bacterial activity, the available nutrient level and rate of supply of nutrients control the observed rate of corrosion. The data available at the present time for estimating all the parameters of the new model are somewhat preliminary and new corrosion monitoring programmes will be required to augment the information and to fully characterize the corrosivity of coastal and harbour waters. However, indicative trends for the parameters, based on currently available data, are given and permit the construction of corrosion loss curves for practical applications.
机译：需要高质量的模型来描述结构钢在海水，微咸水和淡水中的腐蚀，并且这些模型最好应该基于对所涉及腐蚀过程的正确理解。然后应将模型用于解释现场数据，而不是尝试从现场数据中经验得出模型。在此基础上，先前已经提出了一种用于在“海上”条件下浸没的低碳和低合金钢的多相腐蚀-时间模型。本文对该模型进行了回顾，并将其扩展到咸淡水。科学原理表明，盐度不是水腐蚀性的关键问题。相反，当腐蚀由氧化控制时，关键参数是温度，pH和碳酸钙溶解度。对于以后的腐蚀，取决于厌氧细菌的活动，可用的养分水平和养分供应速率控制着观察到的腐蚀速率。目前可用于估算新模型所有参数的数据尚处于初步阶段，将需要新的腐蚀监测程序来增加信息并充分表征沿海和港口水域的腐蚀性。然而，基于当前可获得的数据，给出了参数的指示性趋势，并允许构建用于实际应用的腐蚀损失曲线。

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