Corrosion behavior of Stainless Steel Welds by Microbes in Marine Water
Corrosion behavior of Stainless Steel Welds by Microbes in Marine Water
复制标题
海水中微生物对不锈钢焊缝的腐蚀行为
DOI：
10.2207/qjjws.22.443
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
Y. Kikuchi
中科院分区：
文献类型：
--
作者：
Y. Miyano;M. Yamamoto;Kazuya Watanabe;Akira Omori;Y. Kikuchi
输送海水的不锈钢管道焊接接头冷却系统的腐蚀故障被怀疑是生物腐蚀。用于工厂冷却水的海水被转移到实验室并用于实验。在第一个实验中，焊缝金属样品暴露于测试溶液（海水和无菌海水（对照））中 56 天。使用扫描电子显微镜（SEM）观察实验试样的表面状况。在另一项实验中，对这些材料的自由腐蚀电位进行了 56 天的监测。在暴露于海水的试样中发现点蚀。发现与对照相比，自由腐蚀电位显着升高。怀疑该腐蚀案例为生物腐蚀。在第二个实验中，将试样暴露于含有从用于第一个实验的引起生物腐蚀的海水样品中分离出的微生物单一培养物的稀释营养培养基中。暴露测试后，使用SEM观察实验试样的表面状况。在暴露于一些分离物的试样中发现了点蚀部位。结果表明它们有助于 SUS316L 焊缝的腐蚀作用。
Biocorrosion was suspected in the corrosion failure of a cooling system of a stainless piping welded joint, carrying marine water. Marine water, which is used for cooling water in a plant was transferred to the laboratory and used for experiments. In the first experiment, weld metal samples were exposed to the test solution for 56 days (marine water and sterilized marine water (control)). The surface condition of experimental coupons was observed using a Scanning Electron Microscope (SEM). In another experiment, the free corrosion potential of these materials was monitored for 56 days. Pitting corrosion was found in the coupons exposed to marine water. Free corrosion potential ennoblement was found to be significant compared to the controls. It was suspected that this corrosion case was biocorrosion. In the second experiment, coupons were exposed to diluted nutrient medium containing single cultures of microbes isolated from the biocorrosion causing marine water sample used for the first experiment. After the exposure test, surface condition of the experimental coupon was observed using SEM. Pitting corrosion sites was found in coupons exposed to some of the isolates. The results indicate that they contribute to the corrosive effect of the SUS316L welds.