HDR双相不锈钢海水管路防腐技术研究

文章针对海水管系中结构的电偶腐蚀问题,对HDR双相不锈钢海水管路的耐腐蚀性能进行了研究,并提出了防止腐蚀的措施。     

船舶海水管路缝隙腐蚀密封性能失效分析及其防护措施

缝隙腐蚀是一种很普遍的局部腐蚀。船舶管路通常在有海水存在的金属之间,以及金属与非金属之间构成的狭窄缝隙内发生腐蚀。B10和HDR双相不锈钢在船舶海水管路使用过程中均出现了不同程度的缝隙腐蚀。文章从腐蚀电化学的某些层面厘清缝隙腐蚀产生的机理,重点针对HDR双相不锈钢缝隙腐蚀实样进行SEM形貌分析和EDS能谱分析,得出缝隙腐蚀的成因和影响因素,并提出若干相应防护措施。     

海洋工程装备异种材料的电偶腐蚀兼容性

针对海洋工程装备产品的腐蚀评价需求及当前试验方法适用性差的弊端，提出一种适用于海洋工程装备异种材料电偶腐蚀兼容性评价方法，设计并制作一套海水环境下电偶腐蚀敏感性测试装置，在静态和动态2种全浸海水环境下对8种电偶对进行了电偶腐蚀兼容性评价试验。结果表明：相比实海挂片试验方法和薄液膜下电偶腐蚀试验，静态/动态海水全浸电偶腐蚀敏感性试验装置更适用于海洋工程装备异种材料电偶腐蚀兼容性的评价；由于偶对回路中阴阳极金属极化率的影响，电偶腐蚀电流密度与试验条件关联性远强于腐蚀电位差，电偶腐蚀电流密度更适宜作为海洋工程装备异种材料电偶腐蚀兼容性的评价判据。     

石油钻井平台输油钢管开裂原因分析

通过金相检验,化学成分分析以及扫描电镜分析,石油钻井平台用钢管的早期失效原因是焊缝发生海水电偶腐蚀和缝隙腐蚀造成。     

某型柴油机回油冷却器改进方案设计

某型柴油机回油冷却器管束端部结构为锡封结构,由于灌锡时存在串珠状缩孔、纯锡在流动海水中的耐腐蚀性较差,再加上本体B10铜镍合金与纯锡存在显著的电偶腐蚀作用,使锡封端部发生腐蚀,形成穿透性孔洞,致使回油冷却器泄漏损坏.文章介绍了冷却器端部结构工艺改进方案的设计.     

舰船海水管路系统电偶腐蚀控制技术

进入新世纪以来,舰船海水管路系统材料逐步发展为以铜镍合金为主干材料,铸造青铜合金为配套材料的材料体系,同时钛及镍基合金的比例持续升高。这些高电位金属一方面大幅提升了海水管路的耐海水腐蚀性能,尤其是耐冲刷腐蚀性能,另一方面也提高了钛、镍基合金管路与低电位的铜合金管路及附件连接时的电偶腐蚀风险。为应对钛及镍基合金应用带来的上述风险,美国等国外海军通过长期试验研究,对于舰船海水管路系统电偶腐蚀控制系列技术进行了充分评估和考核验证。本文论述国外海军舰船海水管路系统电偶腐蚀控制技术研究的重点方向以及相关考核试验结论,为我国同领域的技术发展提供参考借鉴。     

带铜衬套通舱管件的防腐治理

详细介绍带铜衬套的通舱管件防腐治理过程。在描述腐蚀现象后,充分分析了脱成分腐蚀、缝隙腐蚀、电偶腐蚀等腐蚀机理,得出电偶腐蚀是海水管路通舱管件腐蚀的最重要原因。最后,针对现场修理特点和通舱管件结构,确定了腐蚀治理的施工工艺方法。该方法通过对异种金属的隔离,有效缓解了带铜衬套通舱管件的腐蚀程度。     

舰船海水管系腐蚀监检测技术与应用研究

针对舰船海水管系腐蚀问题,对目前海水管路腐蚀及异种金属电绝缘监检测技术进行分析论证,同时开展以电位差为主要评定依据的电绝缘效果评判标准研究。结果表明,数字X射线实时成像技术为海水管路腐蚀检测的优选技术;电位差法更适合用于湿态下海水管系电偶腐蚀的监检测。以某船机舱海水管系为研究对象,提出了海水管路腐蚀及异种金属电绝缘监检测应用方案,对舰船海水管系腐蚀监检测技术的实船应用具有一定指导意义。     

压滤式电解水制氢电解槽极板腐蚀机理的研究

介绍了电解水制氢装置核心部件电解槽的主极板发生腐蚀的现象,研究并分析了极板腐蚀发生的原因,笔者认为主极板腐蚀的机理属于电偶腐蚀 孔蚀,碱液中有害离子是导致腐蚀发生的必要条件。针对主极板腐蚀发生的情况,提出了解决措施。     

船舶的电化学腐蚀及防止措施

一船舶电化学腐蚀的种类金属表面与离子导电的电解质溶液发生电化学作用产生的破坏,称为电化学腐蚀。船上的电化学腐蚀一般为局部腐蚀,常见的腐蚀主要有以下几种:(1)电偶腐蚀船上零件只要能构成异金属接触电池,就会发生电偶腐蚀。这种腐蚀较为普遍,例如离心泵的叶轮与泵轴,冷凝器的碳钢壳体与黄铜管子等构成的腐蚀,即为电偶腐蚀。(2)氧浓差腐蚀金属零件与含氧量不同的溶液接触,就会形成氧浓差电池。溶液含氧浓度越高,电极的电位就越高,成为阴极,与含氧浓度低的溶液接触的电极成为阳极,阳极被腐蚀。例如柴油机气缸套与气缸体下部密封圈处的缝…     

舰船海水管系选材及防腐对策

阐述了舰船海水管系腐蚀因素及试验结果分析，针对海水管系腐蚀特点，提出了海水管系选材和工艺要求，以及海水管系的防腐对策。     

船舶海水管系管材腐蚀及防腐技术探讨

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.     

钛合金在铝合金舰船海水管路系统的应用

钛合金具有质量轻、强度高、耐海水腐蚀、无磁性等特点,在军用舰船上具有广泛的应用前景,尤其适用于对重量控制和防腐蚀要求较高的高速舰船、铝合金舰船。某型铝合金艇采用钛合金海水管系,经过十多年的使用表明具有良好的效果。该文详细介绍该艇钛合金管系选材、设计、施工、应用效果及存在问题,并提出钛合金材料在舰船上应用的建议。     

天然海水中HE15/MDN138和HE15/MDN250合金的原电池反应（英文）

HE15 is a heat treatable high strength alloy with excellent machinability find wide applications in aerospace and defence industries. In view of their excellent mechanical properties, workability, machinability, heat treatment characteristics and good resistance to general and stress corrosion cracking, MDN138 MDN250 have been widely used in petrochemical, nuclear and aerospace industries. The galvanic corrosion behaviour of the metal combinations HE15/MDN138 and HE15/MDN250, with 1:1 area ratio, has been studied in natural seawater using the open well facility of CECRI's Offshore Platform at Tuticorin for a year. The open circuit potentials of MDN138, MDN250 and HE15 of the individual metal, the galvanic potential and galvanic current of the couples HE15/MDN138 and HE15/MDN250 were periodically monitored throughout the study period. The calcareous deposits on MDN138 and MDN250 in galvanic contact with HE15 were analyzed using XRD. The electrochemical behaviors of MDN138, MDN250 and HE15 in seawater have been studied using an electrochemical work station. The surface characteristics of MDN138 and MDN250 in galvanic contact with HE15 have been examined with scanning electron microscope. The results of the study reveal that HE15 offered required amount of protection to MDN138 MDN250.     

船用离合器摩擦靴腐蚀故障分析与防护对策

某船用离合器在使用过程中摩擦靴与矩形销出现了腐蚀现象.文章对这种腐蚀现象进行分析,提出了多种隔离防护方案,并通过相关试样耦合的电偶腐蚀试验研究及试样盐雾试验研究,对比筛选出较优的配对耦合,作为最终的防护实施对策.     

Galvanic interactions of HE15 /MDN138 & HE15 /MDN250 alloys in natural seawater

HE15 is a heat treatable high strength alloy with excellent machinability find wide applications in aerospace and defence industries. In view of their excellent mechanical properties, workability, machinability, heat treatment characteristics and good resistance to general and stress corrosion cracking, MDN138 & MDN250 have been widely used in petrochemical, nuclear and aerospace industries. The galvanic corrosion behaviour of the metal combinations HE15 /MDN138 and HE15 /MDN250, with 1:1 area ratio, has been studied in natural seawater using the open well facility of CECRI’s Offshore Platform at Tuticorin for a year. The open circuit potentials of MDN138, MDN250 and HE15 of the individual metal, the galvanic potential and galvanic current of the couples HE15 /MDN138 and HE15 /MDN250 were periodically monitored throughout the study period. The calcareous deposits on MDN138 and MDN250 in galvanic contact with HE15 were analyzed using XRD. The electrochemical behaviors of MDN138, MDN250 and HE15 in seawater have been studied using an electrochemical work station. The surface characteristics of MDN138 and MDN250 in galvanic contact with HE15 have been examined with scanning electron microscope. The results of the study reveal that HE15 offered required amount of protection to MDN138 & MDN250.     

天然海水中15CDV6/MDN138及15CDV6/MDN250合金的电流相互作用（英文）

The galvanic corrosion behavior of the metal combinations 15 CDV6/MDN138 and 15 CDV6/MDN250, with 1:1 area ratio, has been studied in natural seawater using the open well facility of CECRI's Offshore Platform at Tuticorin for a year. The open circuit potentials of MDN138, MDN250, and 15 CDV6 of the individual metal, the galvanic potential and galvanic current of the couples 15 CDV6/MDN138 and 15 CDV6/MDN250, were periodically monitored throughout the study period. The calcareous deposits on MDN138 and MDN250 in galvanic contact with 15 CDV6 were analyzed using XRD. The electrochemical behavior of MDN138, MDN250, and 15 CDV6 in seawater was studied using an electrochemical work station. The surface characteristics of MDN138 and MDN250 in galvanic contact with 15 CDV6 have been examined with a scanning electron microscope. The results of the study reveal that the galvanic protection offered by15 CDV6 to MDN250 and MDN138 in natural seawater amounts to 93% and 98%, respectively, implying that the galvanic protection offered by 15 CDV6 is continuous and effective, which has been further evinced from the adherent nature of the calcareous deposit film comprising compounds such as CaCO_3(calcite, aragonite, and vaterite), MgCO_3(magnesite),Mg(OH)_2(brucite), and MgO(brucite).     

船舶海水管路系统振动特性计算与分析

为系统性地分析船舶海水管路系统的振动特性,采用有限元法建立泵组-隔振器-挠性接管-管段-支承-管路附件系统的频率域计算模型。以某海水管路系统为研究对象,通过数值仿真计算分析系统固有振动特性和振动传递特性。结果表明,挠性接管刚度对泵组-管段之间的振动传递比较关键,当其低于1/10的振源泵组隔振器刚度时,传递至管段的振动大幅衰减;优化管路附件、支承结构等可使管段弯曲振动频率避开泵组的低频激励频率,对抑制特定频段的振动传递比较有效。     

全钛冷凝器主循环水系统的电偶腐蚀及其防护

现代舰船主循环水系统多采用全钛冷凝器，但采用全钛冷凝器对冷却系统中其它结构材料将产生电偶腐蚀作用，本文通过电偶腐蚀试验和系统腐蚀试验，查明了这种影响，并提出了防止钛合金对其它电位较负荷材料产生电腐蚀作用的措施。