共查询到18条相似文献，搜索用时 93 毫秒
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海洋工程用铝基牺牲阳极发展概况 总被引：5，自引：0，他引：5
阴极保护是一种重要的腐蚀防护方法,它分为外加电流保护和牺牲阳极保护。其中 ,用牺牲阳极保护金属构件是一种简单易行 ,投资较少的阴极保护方法。因此 ,在船舶、码头、海洋平台及其他海上大型钢结构的保护上 ,得到了广泛的应用［３］。阴极保护用的牺牲阳极材料有铝、镁、锌三大系列。张经磊１９８６年指出 ,与镁基、锌基牺牲阳极相比 ,铝阳极的最突出优点是单位重量的输出电量大 ,是锌阳极的３．６倍 ,镁阳极的１．３倍 ;铝资源充足 ,价格便宜 ,重量轻 ;工作电位足够负 ,发生电流量大 ,寿命长 ,在海水和含Ｃｌ-的环境中应用性能良好。而… 相似文献
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钛/碳钢在海水中电偶腐蚀的研究 总被引：4，自引：0，他引：4
研究了国产纯钛和碳钢Q235在青岛近海海水中的电偶腐蚀情况。测定这两种金属材料的自然腐蚀电位和失重速率；用IM6e电化学工作站测定两种金属材料在海水中的稳态极化曲线，研究其极化性能；测定了碳钢与钛组成不同面积比、不同温度、不同海水流速时电偶电流的大小、方向，电偶电位，以及不同面积比时阳极的失重速率。结果表明，阳极的腐蚀速率随阴／阳极面积比、环境温度、海水流速的增大而增加，且阳极腐蚀速率随阴／阳极面积比的增大趋于极限值。 相似文献
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目前，城市用水中约80%是工业用水，而工业用水中约80%是工业冷却水。为节约淡水，人们试图利用海水代替淡水做工业冷却水。但在海水冷却系统中，换热器的出口及其后续部分的钢铁设施由于海水温度较高(一般在50℃左右，有的还大于55℃)，腐蚀现象相当严重，解决该部位的腐蚀防护问题是直接利用海水代替淡水做工业冷却水中不可缺少的一个环节。牺牲阳极是防止海水中钢铁设备腐蚀的一种行之有效的方法，但常用的几种牺牲阳极在该温度下不能适用。因此，找出牺牲阳极性能在不同温度下的变化规律，对研制能在高温下使用的牺牲阳极有着重要的理论和实际意义。
工作电位是牺牲阳极一项重要的性能指标。牺牲阳极只有具备了足够负的工作电位，才能在实际应用中保持足够的驱动电压(朱相荣等，1999；火时中，1988)，达到长期使用的目的。有关文献报道了牺牲阳极添加元素对工作电位的影响(朱承德等，1997；Gurrappa1997；张信义等，1996)，但哪些元素对阳极工作电位的影响更大些，元素对工作电位的影响是否有一定的规律，却均无报道。本文作者根据以上文献选择元素，自制了28种铝基牺牲阳极，并按国标GB4948-85的方法进行实验，用灰箱分析的数学方法对得到的数据进行分析，所得结果对研制高温海水中如何应用牺牲阳极有一定的指导作用。 相似文献
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介绍了嘏基斯坦卡西姆港化学码头钢管桩实施牺牲阳极阴极保护所进行的钢桩保护面积计算和保护电位测量,以及根据涂层状况经设计计算,安装牺牲的阳极的型号、数量和阳极材料的性能检测。 相似文献
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南汇县芦潮港水闸位于上海市东南角,面临东海。在淡海水介质作用下闸门钢板遭受严重锈蚀。虽然采用了涂料保护,闸门的检修保养期也只有3～4年。本文试验了涂料与牺牲阳极联合保护。Al-Zn-In-Sn 阳极证明是一种较好的牺牲阳极材料,它的保护效果达到95%以上。闸门钢板保护电位平均等于-0.80伏(对 Ag/AgCl 参比电极),电位分布均匀。采用的保护电流密度等于15～20毫安/米~2。铝合金牺牲阳极保护有明显的经济效益,而且安装方便,不需要专人管理。因此,这种保护方法对沿海挡潮闸的保护有普遍意义。 相似文献
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The sacrificial anode protection system for the steel pipe piles of the 3rd berth of Dandongwharf at Dandong port has operated for eight years.In this paper,the program design and the protectioneffect of the sacrificial anode protection system are presented.The results of various,inspections show thatthe piles are protected very satisfactorily. 相似文献
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利用正交试验的配比方法炼制了不同Zn、In、Mg、Ti含量Al-Zn-In-Mg-Ti牺牲阳极9组,采用恒电流和极化曲线方法评价了牺牲阳极的电化学性能。结果表明:电流效率随着钛含量的增加呈上升趋势,随着铟含量的增加而呈下降趋势,随着锌、镁含量的增加先下降后升高。阳极为均匀溶解,未出现钝化现象,溶解过程表现出2种放电过程。最佳阳极配比(wt%)为:Zn 6.0,In 0.020,Mg 1.5,Ti 0.080,余量为Al。 相似文献
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Mangrove swamps and hypersaline saltflats fringe many estuaries in dry tropical climates, especially in Northern Australia. For most of the year these estuaries receive zero riverine freshwater input and thus, after the wet season, a steady increase in salinity occurs. In some locations the estuary becomes fully inverse, i.e. the salinity increases monotonically from the mouth to the head. In other locations, a salinity maximum zone separates the sea from low salinity water that persists at the head of the estuary throughout the dry season. Field data from five estuaries indicate that in short estuaries where a large area of saltflats and mangroves extends over the whole length of the estuary, the estuary becomes completely inverse with salinity rising to 55 within a couple of months. The evaporation and evapotranspiration over the saltflats and mangroves cause this rapid increase in salinity. Longer estuaries where a large area of salt flat exists only close to the mouth do not become completely hypersaline for the whole length of the estuary by the end of the dry season. A salinity-maximum is generated close to the river mouth but salinities of less than 10 persist in the upper reaches of the estuary until the end of the dry season, even though the estuary does not receive any further freshwater input. A simple analytical expression is presented that reproduces the changes in salinities in the estuaries studied. This model can be used to predict the formation of hypersaline conditions in other mangrove and saltflat fringed estuaries where freshwater flow is negligible. 相似文献
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Steel bar in concrete structures under harsh environmental conditions, such as chlorine corrosion, seriously affects its service life. Bidirectional electromigration rehabilitation (BIEM) is a new method of repair technology for reinforced concrete structures in such chloride corrosion environments. By applying the BIEM, chloride ions can be removed from the concrete and the migrating corrosion inhibit can be moved to the steel surface. In conventional engineering, the concrete structure is often configured with a multi-layer steel mesh. However, the effect of the BIEM in such structures has not yet been investigated. In this paper, the relevant simulation test is carried out to study the migration law of chloride ions and the migrating corrosion inhibitor in a concrete specimen with complex steel mesh under different energizing modes. The results show that the efficiency of the BIEM increases 50% in both the monolayer steel mesh and the double-layer steel mesh. By using the single-sided BIEM, 87% of the chloride ions are removed from the steel surface. The different step modes can affect the chloride ion removal. The chloride ions within the range of the reinforcement protective cover are easier to be removed than those in the concrete between the two layers of steel mesh. However, the amount of migrating corrosion inhibitor is larger in the latter circumstances. 相似文献