共查询到19条相似文献,搜索用时 78 毫秒
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研究了铝合金阳极在低温条件下的电化学性能,在2~3℃低温条件下,对铝合金牺牲阳极电化学性能进行了DNV-RP-B401-2011测试和NACE-TM0190-2006测试,结果表明,同种化学成分的条件下,样品1的溶解形貌和电化学数据均好于样品2的结果,3种不同成分的铝合金阳极中,样品4的电化学性能结果最好。在2~3℃低温环境下,由于活性元素的反应活性更弱,铝合金牺牲阳极电化学性能DNV-RP-B401-2011测试结果与NACE-TM0190-2006测试结果相比,前者溶解形貌要更差一些。阳极中微量元素的精确控制和均匀分布,对铝合金牺牲阳极的电化学性能和溶解性能影响较大。 相似文献
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铝合金牺牲阳极材料研究现状 总被引:8,自引:0,他引:8
铝合金牺牲阳极具有许多优点,近年来得到了广泛的应用。介绍了铝合金牺牲阳极材料中常用合金元素的作用、铝合金牺牲阳极的活化机理、主要的几类铝阳极材料、铝合金牺牲阳极应用概况以及发展前景。 相似文献
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为提高Al牺牲阳极的综合性能,采用电化学性能评价试验、电化学阻抗测试、极化测试、金相分析和微区电位分布分析等方法研究了 Mg元素含量对Al-Zn-In-Mg-Ti-Ga-Mn牺牲阳极性能的影响,确定了铝基牺牲阳极中Mg元素的合理含量.结果表明:随着Mg含量的增加,牺牲阳极实际电容量有所提升,Mg元素含量变化主要通过影响牺牲阳极晶粒尺寸、内析出物数量和分布来影响牺牲阳极的各项性能,当Mg含量为0.8%时,Al-Zn-In-Mg-Ti-Ga-Mn 牺牲阳极性能较优. 相似文献
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提高海水温度对锌合金和铝合金牺牲阳极电化学性能的影响 总被引:1,自引:0,他引:1
研究了提高海水温度对锌合金和铝合金牺牲阳极电化学性能的影响。结果表明,锌合金和铝合金牺牲阳级的电化学性能都随着海水温度的提高而变劣;凡是发生晶间腐蚀的合金,其晶间腐蚀程度都随着海水温度的提高而加剧。低含铝量的锌-铝-镉合金阳极在70℃海水介质中,工作电位仍负于-1.010V,电流效率>80%,阳极工作表面溶解均匀,且不产生晶间腐蚀。 相似文献
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铝牺牲阳极在热海泥中的电化学性能 总被引:2,自引:0,他引:2
测试了几种用于海泥中海底输油管线保护的铝合金牺牲阳极的电化学性能。获得了两种性能优良的阳极材料 ,该材料可用于海底管线和金属构筑物的阳极保护 相似文献
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Oxide films are incorporated into melts by an entrainment process, and are expected to be present in most metals, but particularly cast Al alloys. The oxides are necessarily present as folded-over double films (bifilms) that are effectively cracks. Their effect on the electrochemical behaviour of cast Al-5Zn-0.02ln sacrificial anodes was studied in 3 wt pct sodium chloride solution using the NACE efficiency evaluation. Three methods were employed to entrain progressive amounts of oxide in the alloy, including the addition of Al-Zn-ln maching chips to the charge, increasing the pouring height, and agitating the melt. The introduction of oxide bifilms in the cast alloy resulted in the deterioration of the electrochemical properties of the sacrificial anodes, such as current capacity and anode efficiency, and introduced increasing variability in these properties. The results suggest that corrosion behaviour is strongly related to the presence of bifilms suspended in the liquid alloy because bifilms provide crack paths allowing the corrodant to penetrate deeply into the metal matrix, and simultaneously provide localized galvanic cells because of the precipitation of Fe rich intermetallic compounds on their outer surfaces. 相似文献
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以高温固相合成的NiFe_2O_4和Cu,Ni,Fe金属粉为原料,采用冷压烧结法制备不同合金相含量的(Cu-Ni-Fe)-xNiFe_2O_4(x=50,60,70,80,质量分数/%,下同)金属基复合惰性阳极材料,研究合金相中Fe元素对(Cu-Ni-Fe)-xNiFe_2O_4金属基复合惰性阳极材料烧结和电解过程中基体成分与微观组织的影响,发现合金相中的Ni,Fe及NiFe_2O_4陶瓷相在烧结和电解过程中发生了可逆的氧化还原反应,使得NiFe_2O_4相发生解离和再生成。对(Cu-Ni-Fe)-xNiFe_2O_4金属基复合惰性阳极材料进行了低温电解性能测试,研究其在电解过程中的成膜过程和腐蚀行为。结果表明:(Cu-Ni-Fe)-xNiFe_2O_4金属基复合惰性阳极材料电解过程中电压稳定,铝液杂质含量低于0.7%(质量分数),有望解决金属陶瓷阳极热稳定性差的问题,是理想的惰性阳极材料。 相似文献
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《Materials Letters》2007,61(14-15):3000-3004
Metal composites of alumina and zinc oxide were incorporated into Al + 5% Zn alloy and the reinforced alloys were used as efficient sacrificial anodes for cathodic protection of steel objects. ZnO was not only used to reinforce the alloy matrix and improve the metallurgical characteristics but also to yield effective activation of the sacrificial anodes. Galvanic efficiency as high as 83% was achieved when 0.5% ZnO was incorporated into the anode matrix. High and steady negative potential, very low polarization and substantial reduction in self-corrosion of the anodes were observed during prolonged galvanic exposure tests. However, the incorporation of alumina into the anode matrix led to an adverse effect. 相似文献
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分别论述了铝合金牺牲阳极、锌合金牺牲阳极、铁合金牺牲阳极的研究和发展过程,总结了各种阳极的研发现状、研发热点和相应的阳极产品研发成果,指出了针对特殊环境和细分领域的各种阳极,是阳极新材料未来发展的主要方向。对于铝合金牺牲阳极,介绍了常规铝合金牺牲阳极和包括海水环境低驱动电位阳极、油污海水低驱动电位牺牲阳极、适用于干湿交替环境的阳极和适用于高温环境中的阳极等在内的针对特殊环境和特殊材料的铝合金牺牲阳极在舰船阴极保护领域的应用,总结了船舶用铝合金牺牲阳极的研究进展;对于锌合金牺牲阳极,主要介绍了锌合金牺牲阳极的发展历史、研究现状和相应的阳极产品;对于铁合金牺牲阳极,主要总结了铁合金牺牲阳极的研究现状和在舰船上的实际应用。 相似文献