共查询到20条相似文献,搜索用时 93 毫秒
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在不同浓度溴化锂溶液中,对目前溴冷机中常用不锈钢的全面腐蚀及局腐蚀进行了综述,进而展望了不锈钢的应用前景。 相似文献
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溴化锂吸收式制冷机换热管腐蚀失效分析 总被引:1,自引:0,他引:1
对某制冷机组吸收器的冷却水管出现不同程度的腐蚀穿孔进行宏观和微观形貌分析,对腐蚀孔附近腐蚀产物进行扫描电镜-能谱分析,并对冷却水管化学成分、冷却水质和溴化锂溶液进行分析。指出吸收器壳体开裂导致大量空气进入溴化锂水溶液,产生点蚀源,铜管的化学成分为点蚀的产生提供了材料条件,冷却水硬度超标加剧了铜管点腐蚀。 相似文献
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应用化学浸泡失重法和电化学测试技术,研究了溴化锂溶液中铬酸锂对碳钢的缓蚀影响。结果表明,铬酸锂作为阳极型缓蚀剂能够促使钝化膜生成,并抑帛最阳极过程,当添加0.05%以上Li2CrO4时体系碳钢的腐蚀电位到达孔蚀电位,诱发了孔蚀。 相似文献
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3%NaCl溶液中碳—铜接触腐蚀及其缓蚀剂的研究 总被引:1,自引:0,他引:1
研究了3%NaCl溶液中碳-铜短路体系的接触腐蚀行为。测定了铜片与碳棒以各种面积比进行短路接触时铜的腐蚀电流、电偶电流和腐蚀电位。结果表明,该腐蚀属阴极氧去极化型腐蚀,与不锈钢-碳钢短路体系的腐蚀行为非常相似。同时还用极化测量对该溶液中碳-铜短路体系的接触腐蚀及其缓蚀剂的评定方法进行了探讨,取得了较好的结果。 相似文献
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原油高温腐蚀评价及预测技术的研究进展 总被引:1,自引:0,他引:1
综述了国内外原油高温腐蚀评价及预测技术的研究现状,归纳分析了原油高温腐蚀的影响因素、原油高温腐蚀评价方法与装置以及对原油高温腐蚀预测的研发现状。重点论述了高压反应釜、高温动态模拟和现场腐蚀评价方法与装置的应用情况及其存在的问题;同时,对目前预测原油高温腐蚀的方法,如McConomy曲线,API RP581计算方法及国内有代表性的高温动态模拟评估方法进行了探讨;最后对今后预测原油高温腐蚀性的研究方向进行了展望。 相似文献
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吴崇权 《中国新技术新产品》2008,(10):77-77
针对空压站工厂风母管发生的腐蚀泄露,通过对该管线的宏观检查、管壁侧厚及腐蚀产物等进行了分析,结果表明管线及盲法兰腐蚀是由于管线发生吸氧腐蚀及缝隙腐蚀造成。 相似文献
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Neklyudov I. M. Sytin V. I. Voevodin V. N. Shevchenko S. V. Lopata A. T. Rybal'chenko N. D. 《Materials Science》2003,39(5):740-744
We investigate the corrosion behavior of copper microalloyed with yttrium. We show that microalloyed copper containing 0.02–0.03% yttrium is not susceptible to intercrystalline corrosion, while the rate of general corrosion of microalloyed copper containing 0.015–0.02% yttrium is a factor of three to four lower than that of M0b oxygen-free copper. 相似文献
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使用缓蚀剂是解决铜及其合金腐蚀问题的有效方法之一。本文综述了无机、有机、天然高分子等缓蚀剂及自组装技术在提高铜及其合金耐蚀性能方面的研究现状,并对其发展趋势进行了展望。 相似文献
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铜合金在海水中的腐蚀行为研究 总被引:4,自引:1,他引:3
通过高速旋转腐蚀试验,X射线衍射,扫描电镜(SEM)及能谱分析(EDAX),高化学特征测定等对Cu-2,9Sn-0.9Al铜合金在人工海水中的腐蚀行为进行了研究,结果表明,添加2.9%Sn,0.9%Al的铜合金在室温,pH值为8.2的人工海水中具有较好的耐腐蚀性,其高耐蚀性主要是由于在合金表面形成一层氧化膜,它对阳极过程和阴过程都有影响,这层膜是Cu的氧化物和Sn的氧化物及Cu-Al-Mg共析化合物的复合保护膜,它们的协同作用降低了氧化层的孔隙度,从而避免了局部酸性区域的形成而导致的局部腐蚀。 相似文献
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The corrosion behavior of particulate reinforced graphite/copper (Grp/Cu) metal matrix composites (MMCs) was studied in 3.5 wt.% sodium chloride solution using electrochemical techniques, ionic
solution analysis, scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), and X-ray diffraction (XRD)
techniques. The materials under investigation were high energy-high rate (HEHR) consolidated Grp/Cu metal matrix composites. HEHR processing employs a 10 MJ homopolar generator that supplies a 100 kA pulse to rapidly heat
and solidify the composite powder compact. This short time at high temperature and the preferential heating and melting at
the graphite-copper interface serve to encapsulate the graphite reinforcement, thus providing a highly densified composite
product.
Initially the open circuit potential corrosion behavior of 1.2, 5, 15, 25, and 40 volume percent GrpCu composites was studied in aerated and deaerated 3.5 wt.% NaCl solution using SEM and EDX. Subsequently, the environmental
stability of these composites was studied using electrochemical techniques such as polarization resistance and potentiodynamic
polarization. The severity of corrosive attack increased with increasing graphite content and in aerated solutions. In addition,
solutions from these tests were analyzed to determine the relative amounts of copper and carbon present in the electrolyte
after polarization tests. Microscopic analysis techniques were used to characterize the corrosion morphologies and the extensive
localized corrosion occurring at the graphite-copper interface. The effectiveness of benzotriazole as a corrosion inhibitor
for the copper MMCs was also studied. 相似文献
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R. Ganapathi Sundaram M. Thamaraiselvi G. Vengatesh M. Sundaravadivelu 《Journal of Failure Analysis and Prevention》2018,18(5):1168-1180
The inhibition performance and surface protection of green corrosion inhibitor 8-quinoline sulphonyl chloride (8QSC) on copper (Cu) was evaluated by chemical (weight loss) method in 0.5, 1.0 and 2.0 M HNO3 solutions and by electrochemical methods such as potentiodynamic polarization (PDP), AC-impedance spectroscopy (AC-IS) and linear polarization resistance in 1.0 M HNO3 solution at room temperature. Both chemical and electrochemical techniques showed that 8QSC is an efficient green corrosion inhibitor for copper and the efficiency reached 90.4% by weight loss method and 88.4% by AC-IS method at optimum concentration of (300 ppm) 8QSC. The adsorption behavior of 8QSC on copper metal in acid medium obeyed the Langmuir isotherm. The thermodynamic parameters of the adsorption processes were calculated and discussed. AC-IS technique exhibits one capacitive loop, indicating that the corrosion reaction was controlled by charge transfer process. The PDP curves revealed that 8QSC acts as a mixed-type inhibitor. Protective layer of 8QSC on copper surface was examined by SEM, AFM and FT-IR techniques. The experimental results corroborated with results obtained from theoretical DFT studies. 相似文献
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聚天冬氨酸和钨酸钠复配对氯化钠溶液中铜的缓蚀作用研究 总被引:4,自引:0,他引:4
采用交流阻抗法和极化曲线法,研究了两种环境友好型水处理药剂聚冬天氨酸和钨酸钠的单一配方以及复配对3%NaCl溶液中铜的缓蚀效果.研究表明:聚冬天氨酸和钨酸钠各自的单一配方对于铜均具有一定的缓蚀效果,其中聚冬天氨酸在浓度为40 mg/L时效果最佳,钨酸钠在浓度为350 mg/L时效果最佳.当二者复配使用时,在缓蚀剂总浓度为40 mg/L时,聚冬天氨酸与钨酸钠配比为1:5时效果最佳,具有协同效应;在缓蚀剂总浓度为350 mg/L时,聚冬天氨酸与钨酸钠配比为7:1,5:1,3:1,1:5,1:7时具有明显的缓蚀效果,且具有协同效应,其中以配比7:1为最佳. 相似文献