共查询到18条相似文献,搜索用时 140 毫秒
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依据阴极保护的理论分析了铁基牺牲阳极保护铜冷却器的可行性;收集了几种典型的国产铁基牺牲阳极材料与俄罗斯的铁基牺牲阳极材料进行了室内电化学保护性能对比,并且选取了国产Q235B材质的铁基牺牲阳极与俄罗斯的CT3nc材质铁基牺牲阳极,在实船冷却器上进行了对比应用试验。结果表明,国产铁基牺牲阳极材料的电化学性能与俄罗斯的阳极材料相当,工作电位处于船用铜合金的保护电位范围,电流效率略高于俄罗斯铁基牺牲阳极;实船试验选用的国产Q235B材质铁基牺牲阳极,其活化性能略优于俄罗斯的CT3nc材质铁基牺牲阳极,其保护期效远长于传统的锌合金牺牲阳极。 相似文献
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邓和平 《特种铸造及有色合金》1984,(4)
铝基牺牲阳极合金,是一种供舰船及海上设施金属防腐保护用的新型“牺牲阳极”材料。近年来国外海洋石油钻探平台,多采用铝基阳极作阴极保护。 铝基牺牲阳极与镁基或锌基牺牲阳极比较,成本最低、寿命最长、性能良好、工艺简便。在有关科研部门的支持、帮助下,我们开展了“Al-Z_n-I_n-C_d”牺牲阳极的研制工作,取得初步成功。经洛阳725研究所和上海交大检验,本部研试的钻井平台铝基牺牲阳极与国外三种铝基阳极比较,电流效率高、电位负且平稳、表面溶解状况良好。725 相似文献
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针对铁基牺牲阳极在工业生产中的应用,分析了铁基牺牲阳极对电位较正金属 (如Cu、不锈钢和钛合金) 阴极保护的可行性。综述了几种铁基材料作为牺牲阳极的性能,以及作为牺牲阳极在保护Cu、不锈钢和钛合金中的实际应用。提出了铁基牺牲阳极未来的研究重点和发展方向。 相似文献
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综述了镁基牺牲阳极材料的性能特点,并从组织结构,腐蚀电位,电流效率,晶粒细化等方面探讨了合金元素及热处理对镁阳极腐蚀性能的影响,为镁阳极的发展和研究提供一些思路和参考. 相似文献
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铝合金牺牲阳极在南海海泥中的性能研究 总被引:12,自引:2,他引:12
<正> 一、前言铝合金牺牲阳极目前已广泛用于海水中的阴极保护工程,并且取得了满意的保护效果及经济效益。但是铝基牺牲阳极还未能有效地用于海泥中的钢铁结构和海底管线的阴极保护。近年来,随着海洋工程事业发展的需要,国內外一些研究工作者曾进行过新型的铝合金阳极的研制及测试工作,但效果不大。根据我国海上油气田建设的发展情况,需要选择在海泥中具有优良的电化学性能的牺牲阳极材料。为此,对各种不同合金成分的铝合金牺牲阳极材料在实验条件下进行了常温及高温(80℃)条件下的电流效率、电 相似文献
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Development of nano cerium oxide incorporated aluminium alloy sacrificial anode for marine applications 总被引:1,自引:0,他引:1
Aluminium-zinc alloy sacrificial anodes are extensively used for cathodic protection. The performance of the sacrificial anodes can be significantly improved by incorporation of microalloying elements in the aluminium matrix. In the present work nano cerium oxide particles of different concentrations, ranging from 0 to 1 wt% were incorporated for activating and improving the performance of the anode. The electrochemical test results revealed the increased efficiency of the anode. The electrochemical impedance spectroscopy revealed the information that the presence of nano cerium oxide in the anode matrix caused effective destruction of the passive alumina film, which facilitated enhancement of galvanic performance of the anode. Moreover, the biocidal activity of cerium oxide prevented the bio accumulation considerably which enables the anodes to be used in aggressive marine conditions. 相似文献
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Nisheeth Kr. Prasad A. S. Pathak S. Kundu K. Mondal 《Journal of Materials Engineering and Performance》2018,27(7):3335-3349
Cathodic protection is an effective method to control the corrosion of underground pipelines and submerged structures. In the present work, high phosphorus containing pig iron was utilized as sacrificial anode for cathodic protection of underground mild steel plates and the results were compared with that of a commercially pure magnesium sacrificial anode. Driving potential and current between the galvanically coupled sacrificial anodes and mild steel plates were continuously monitored in real time for one month. Microstructure and morphology of the corrosion products formed on the surface of pig iron, magnesium sacrificial anodes and mild steel plates were observed with the help of optical microscope and scanning electron microscopy, and phase identification were performed using x-ray diffraction, Raman spectroscopy and Fourier transform infrared spectroscopy. The distribution of phosphorus in the pig iron matrix and soluble rust formation on the surface of pig iron under buried condition were critical from the point of sacrificial effect, indicating the possible scientific reasons for high phosphorous pig iron to be used as sacrificial anode. 相似文献
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目的 研究对比了3种不同配方Al-Zn-In合金阳极在南海环境条件下的腐蚀形貌及电化学容量、电化学效率等性能参数,为深海工程装备的阴极防护设计提供可靠的参考依据。方法 通过在我国南海1200m深海试验架上搭载阳极阴极保护测试装置及数据采集、存储系统,采用自放电测试(Free Running Test,FRT)试验方法研究了阳极在110 d长周期条件下的电化学性能,采用超景深三维显微镜对其表面腐蚀形貌进行了观测。结果 1#—3#阳极下水后工作电位均快速活化,整个试验阶段,平均工作电位分别为-1.029、-1.033、-1.098 V(Ag/AgCl/海水);电化学效率分别为81.62%、78.02%、87.90%。仅自主设计的3#配方阳极的开路电位和电化学效率达到了UNE-EN 12496-2013阴极保护设计标准的要求。结论 与模拟深海环境下的恒电流测试(Galvanostatic Test,GST)短期试验(4 d)结果相比,同一配方阳极在深海110 d长周期FRT测试条件下的电化学效率分别降低15.13%,18.87%和8.14%。长周期FRT试验更接近实际阳极服役状态,可为深海阴... 相似文献
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《腐蚀工程科学与技术》2013,48(4):458-463
AbstractThe effects of rare earth (RE) elemental additions in the form of mischmetal, added into an Al–Zn–In sacrificial anode alloy, were studied in 3% NaCl solution. Scanning electron microscopy and energy dispersive X-ray analysis were employed to analyse the microstructure of all Al alloys. Potentiodynamic polarisation of the anode material and a model alloy that simulated the segregated grain boundary composition were also investigated. The results showed that the microstructure of Al–Zn–In–RE alloy exhibited a typical dentritic form with small precipitates in an Al matrix and eutectic in interdendritic regions. Preferential attack from anodic segregation produced the early pitting and minor element enrichment on the surface, thus activating the anodes. Thus, using a RE mischmetal, which is much cheaper than pure RE elements, Al–Zn–In–RE alloys obtained desirable electrochemical properties for Al sacrificial anodes. 相似文献
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铸造和挤压镁合金牺牲阳极的应用进展 总被引:1,自引:0,他引:1
镁合金牺牲阳极是适用于对在土壤、淡水及海水等介质中工作的金属(主要是钢质)设施进行阴极保护用的一种特殊的电化学功能材料,其用途越来越广泛。本文介绍了铸造和挤压镁合金牺牲阳极材料的一些基本特点、新的镁阳极产品类型,并对镁阳极制造与应用中的一些最新进展情况作了探讨。 相似文献