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| 1 | 304不锈钢螺栓在模拟水下环境中的腐蚀行为研究显示文摘为了明确水下环境(海水,淡水)中304不锈钢螺栓的腐蚀行为,在实验室条件下研究了304不锈钢螺栓在模拟水下环境中的腐蚀行为。通过失重法、极化曲线测试和电化学交流阻抗测试等方法研究了腐蚀产物层对腐蚀行为的影响,利用扫描电子显微镜(SEM),X射线衍射(XRD)和拉曼光谱对不同腐蚀周期的腐蚀产物层形貌、组成和微观组织结构进行了分析,借助扫描激光共聚焦显微镜(SLCM)测量了螺栓表面点蚀坑的深度。结果表明:304不锈钢在海水环境中的腐蚀速率大约是淡水环境中的2倍。在海水中腐蚀坑的深度大约为42.421μm,在淡水中则为23.821μm。304不锈钢螺栓在模拟海水与淡水环境中腐蚀速率均呈现先减后增的趋势。腐蚀周期内发现螺栓样品表面有α-FeOOH、Fe_(3)O_(4)和少量γ-FeOOH生成,且随着腐蚀周期的延长表面腐蚀产物增加,耐蚀性下降。 | 邱萍 许守武 修林冉 程梦鹏 黄留群 | 2021 | 材料保护2021，54，5： | 3 |
| 2 | Optimal Stiffness for Flexible Connectors on A Mobile Offshore Base at Rough Sea States显示文摘This paper investigates a simplified method to determine the optimal stiffness of flexible connectors on a mobile offshore base(MOB) during the preliminary design stage. A three-module numerical model of an MOB was used as a case study. Numerous constraint forces and relative displacements for the connectors at rough sea states with different wave angles were utilized to determine the optimized stiffness of the flexible connectors. The range of optimal stiffnesses for the connectors was obtained based on the combination and intersection of the optimized stiffness results, and the implementation steps were elaborated in detail. The percentage reductions of the optimized and optimal stiffness of the flexible connector were determined to quantitatively evaluate the decreases of the constraint force and relative displacement of the connectors compared with those calculated by using the original range of the connector stiffnesses. The results indicate the accuracy and feasibility of this method for determining the optimal stiffness of the flexible connectors and demonstrate the rationality and practicability of the optimal stiffness results. The research ideas, calculation process, and solutions for the optimal stiffness of the flexible connectors of an MOB in this paper can provide valuable technical support for the design of the connectors in similar semisubmersible floating structures. | WU Lin-jian WANG Yuan-zhan WANG Yu-chi CHEN Jia-yu LI Yi LI Qing-mei XIE Tao | 2018 | China Ocean Engineering2018，32，6： | 1 |
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