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舰船海水管系电偶腐蚀及其防护措施 总被引:1,自引:0,他引:1
HDR双相不锈钢和B10铜镍合金是舰船海水管系中广泛使用的两种金属材料,当与其他金属在海水中偶接,就必然会发生电偶腐蚀。发生电偶腐蚀过程的根本原因是溶液中有去极化剂存在。文章从腐蚀电化学的某些层面厘清HDR、B10海水管系电偶腐蚀的机理,分析了海水管系电偶腐蚀的原因,并提出若干防护措施。 相似文献
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船舶管路腐蚀问题一直是困扰船舶的比较突出的问题之一。文中就船舶海水管路腐蚀的形态、原因和腐蚀机理进行了分析。同时提出了一些防护措施,可供参考。 相似文献
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HDR双相不锈钢的舰船应用研究 总被引:2,自引:0,他引:2
本文阐述了HDR双相不锈钢的耐腐蚀性能及其在治理舰船海水管系防腐蚀方面的显著优点,并提出了实船应用中应予以关注的事项若干事项。 相似文献
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采用不同焊接工艺对2205双相不锈钢进行焊接,分析不同焊接工艺对焊接接头力学性能、微观组织及耐腐蚀性能的影响。结果显示:在晶粒无明显长大时,焊缝及热影响区冲击韧性随奥氏体质量分数的增加而升高;采用熔化极气体保护焊(Gas Metal Arc Welding,GMAW)时,保护气体中加入N2可有效提高焊接接头各区域奥氏体质量分数,从而提高焊接接头力学性能及耐腐蚀性能;2205双相不锈钢母材及焊缝腐蚀速率均明显随腐蚀液质量分数的升高而增加。优化双相不锈钢焊接工艺参数,保证其焊接接头具有良好的综合性能,对于该类材料构件及产品的制造、推广及使用意义重大。 相似文献
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结合S32101双相不锈钢在化学品船建造中出现的大面积点腐蚀,分析腐蚀机理,通过试验、比对等方法,对该类型双相不锈钢的点腐蚀修理提出意见和建议。 相似文献
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Concrete-filled steel tubular (CFST) columns are currently used in offshore structures and oil and gas drilling platforms, from which the external steel tubes become at risk due to the aggressive ocean climate and/or sea water. Therefore, the CFST columns in corrosive environment lose their excellent mechanical performances and safety as the thicknesses of steel tubes decrease due to corrosion. This has recently led to the introduction of the concrete-filled stainless steel tubular (CFSST) columns, which benefit from the stainless steel as a superior metallic corrosion resistant material. Accordingly, CFSST short columns have recently attracted the scientific community. However, circular CFSST slender columns have received very little attention. Currently, this paper provides a nonlinear finite element (FE) inelastic analysis for the axially-loaded circular CFSST slender columns to substitute the lack in their behaviour; especially when the relative cheap lean duplex stainless steel material (EN 1.4162) is utilised. The FE models are firstly validated by using the available test results in literature. This validation stage is, then, followed by a parametric analysis to explore the fundamental behaviour of such columns considering the most important factors. The paper divides the slender columns into intermediate length and long columns based on the type of the overall buckling that takes place, and then the behavioural differences between both types are clearly addressed. The obtained FE axial strengths are additionally compared with those predicted by the European (EC4) and American (AISC) specifications. Based on these comparisons, a formula, based on Eurocode 4, is suggested for the routine compressive design practice of these columns, which is found to fit well with the axial strengths of current slender columns which utilise the lean duplex stainless steel material. 相似文献
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对于2205双相不锈钢焊接后产生的变形,船东一般要求不能通过火工的方法予以矫正;而双相不锈钢在焊接过程中很难控制其变形,双相钢拼板焊接后产生的变形一般用油泵顶或加强筋拉等方法加以矫正,过程复杂。通过介绍沪东中华造船(集团)有限公司在双相不锈钢上应用热处理工艺进行变形矫正的一些分析与试验,提出矫正作业关键控制要点,为相关建造领域中的变形矫正提供预先理论性研究支撑。 相似文献
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船舶海水管系管材腐蚀及防腐技术探讨 总被引:8,自引:0,他引:8
文章主要探讨了船舶海水管系腐蚀的机理和原因,并对一些常用管材的抗腐蚀性能及应用场合作了介绍,对船舶海水管系设计中使用的防腐蚀措施作了较系统的介绍. 相似文献
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2205双相不锈钢焊接应力与变形的SVM回归预测研究 总被引:1,自引:0,他引:1
针对川东造船厂特种船舶制造使用的2205双相不锈钢,在其焊接试验的基础上分别建立了双相不锈钢焊接应力和收缩变形的支持向量机(SVM)回归预测模型,并与传统的逐步回归方法进行比较,较好地模拟了焊接残余应力和变形与板厚、焊接电流、电弧电压、焊接速度等工艺参数之间的非线性关系.计算结果表明,SVM回归比传统的逐步回归在预测精度和泛化能力上都有很大的提高. 相似文献