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表面处理对TC21钛合金与铝合金和钢电偶腐蚀行为的影响 总被引:3,自引:1,他引:3
通过测定TC21钛合金与铝合金和钢电偶电流的方法,研究了TC21钛合金与铝合金和钢在使用接触时发生电偶腐蚀的敏感性.结果表明:TC21钛合金与铝合金和钢形成的电偶对极易发生电偶腐蚀,不能直接接触使用;对钛合金和铝合金分别进行阳极氧化处理可以在一定程度降低电偶腐蚀敏感性.TC21钛合金与钢形成的电偶对,电偶腐蚀行为与钢的成分有很大关系,对钛合金进行阳极氧化处理,对钢进行镀镉或镀镉-钛处理可以提高表面抗腐蚀性能,降低电偶腐蚀敏感性.当TC21钛合金与铝合金和钢接触使用时,必须采取有效的防护措施. 相似文献
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为了弄清30CrMnSiNi2A钢与TC18钛合金表面处理前后的接触腐蚀性能,对2种材料作了不同的表面处理,研究了其偶接电偶腐蚀的敏感性和表面防护效果;对低腐蚀敏感性的偶对不同的连接状态作了模拟海洋大气的盐雾加速腐蚀,测量了30CrMnSiNi2A钢的疲劳寿命,总结了优良的防护措施。结果表明:30CrMnSiNi2A钢与TC18钛合金直接接触腐蚀严重,电偶腐蚀敏感性为D级;30CrMnSiNi2A钢磷化与TC18钛合金阳极氧化后的偶对腐蚀敏感性降低至B级;30CrMnSiNi2A钢磷化涂漆后与TC18阳极氧化偶对的腐蚀敏感性仍为B级,但其电偶电流进一步降低,30CrMnSiNi2A钢(磷化后涂漆)与TC18(阳极化)之间无论是否胶结连接形成偶对时,盐雾腐蚀对30CrMnSiNi2A钢的疲劳寿命没有显著影响。30CrMnSiNi2A钢表面磷化后涂漆是防止接触腐蚀的有效措施。 相似文献
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应用电化学方法研究了碳纤维/环氧复合材料与TC6钛合金、LC4铝合金、30CrMnSiNi2A合金钢的电偶腐蚀行为。在20~60℃温度范围内研究了温度对各偶对的电偶电位及电偶电流的影响。比较了各种紧固件金属材料与碳纤维复合材料构成偶对时的电偶腐蚀性能。 相似文献
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针对镁合金化学和电化学活性较高,与其他金属材料接触时易产生电偶腐蚀的特点,主要研究了其电偶腐蚀特性及环境因素的影响规律.采用电化学方法通过测定电偶电流密度,研究了添加约1%混合稀土RE(45%La,50?)的AZ91合金在NaCl溶液中与A3钢、紫铜偶接时的电偶腐蚀行为,探讨了溶液中氯离子浓度、偶接金属种类以及阴阳极面积比对电偶电流密度JgMg的影响.结果表明:Cl-浓度增大,JgMg变大;阴阳极面积比越大,JgMg也越大;偶接金属A3钢比紫铜更易促进镁合金的腐蚀;稀土La,Ce的添加使电偶腐蚀有效距离变窄. 相似文献
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For the reduction of the weight of vehicle hot‐rolled magnesium alloys as well as carbon fiber reinforced plastics (CFK) shall be integrated into the body structure. Both light weight materials electrochemically are not compatible with galvanized steels or aluminium alloys, unless great efforts of corrosion protection measures are taken. From electrochemical investigations an oxidceramic surface layer deposited by plasmachemical oxidation can be recommended as a promising solution. The low‐porous oxidation deposit with limited insulation effect can be painted by e‐coat in high quality after joining in the body shop and before the full paint system will be deposited. In opposite to magnesium CFK parts have, however, electrochemically a very noble character causing galvanic corrosion of attached metallic parts when the carbon fibers are not fully embedded in the matrix or damaged by the cutting. Only joining elements made from stainless steels or titanium alloys (e. g. Ti‐6Al‐4V) are suitable for the joining of CFK by screwdriving and riveting technology to avoid galvanic corrosion. From view of compatibility of materials, a severe anodic corrosion risk can be eliminated by isolation through adhesive bonding in the flanges and an additional sealing to prevent from electrolyte ingress. 相似文献
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N. A. Al‐Mobarak 《Materialwissenschaft und Werkstofftechnik》2008,39(7):486-491
The electrochemical behavior of two Ti alloys (TA and TAV) and two grades of stainless steels (SS1 and SS2), commonly used as biomedical implant materials, particularly for orthopedic and osteosynthesis applications, was investigated in Hank's solution at 37 °C and different pH. The aim was to distinguish between the behavior of these materials in artificial physiological solution through analysis of their corrosion potential variation with time and potentiodynamic polarization curves. Characterization of the modified surface layers was made by means of microscopic examinations, hardness measurements and X‐ray diffraction analysis. The results indicated that in neutral Hank's solution (pH = 7.2) SS2 and SS1 samples were of higher corrosion resistance than titanium alloys. The behavior was reversed in the acidic media (pH = 5.0 or 3.0), where TA had the least corrosion rate and the corrosion susceptibility increased in the order TA < TAV < SS1 < SS2. 相似文献
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新型航空T-31钛合金导管连接件在模拟服役环境中的抗腐蚀性能研究 总被引:2,自引:0,他引:2
使用自行研制的航空导管连接件腐蚀试验系统,研究了新型航空T-31钛合金导管连接件在模拟服役环境中的气密性、油压气密性以及应力腐蚀、表面腐蚀等综合性能.对这种钛合金导管连接件在高温盐水溶液浸泡与烘烤循环条件下的表面腐蚀及应力腐蚀行为进行了评价;初步探讨了在模拟服役环境中,这种钛合金发生腐蚀的机理.并比较研究了导管材料1Cr18Ni9Ti与连接件钛合金在6%NaCl水溶液中的电偶腐蚀敏感性.研究发现,T-31钛合金导管连接件在模拟服役环境中只在应力集中处发生轻微孔蚀,在试验应力水平下,无应力腐蚀倾向,具有良好的耐蚀性能;并证明,腐蚀介质通过钛合金阳极化膜层小孔渗入基体对基体造成轻微腐蚀,试验应力水平未造成孔蚀发生处裂纹形核;电偶腐蚀试验进一步说明1Cr18Ni9Ti / T-31电偶对有很小的电偶腐蚀电流,用它们制备的导管及导管连接件能安全地进行偶接. 相似文献
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Conclusions 1. Cyclic cracking resistance tests for titanium alloys, as for steels, are affected not only by the state of stress and strain but also by the electrochemical conditions at the crack tip.2. Cyclic corrosion cracking tests require one to consider the electrochemical conditions at the crack tip.3. These methods have been tested in corrosion crack stability tests, which involved monitoring the electrochemical conditions at the surface of the specimen, which do not unambiguously define the corrosion cracking resistance for titanium alloys in a particular medium.4. It is possible to derive invariant fatigue failure diagrams for titanium alloys in a given medium only if one provides constant conditions at the crack tip during growth.5. The electrochemical conditions at the crack tip can be characterized reasonably fully (integrally) for titanium alloys, as for steels, by means of the pH and the electrode potential.6. The type of alloy governs the electrochemical characteristics at the tip of a stationary statically loaded crack and a growing one.7. To select basic fatigue-failure diagrams for a corrosive medium, one can use the methodology developed previously for steels, which is based on invariant diagrams in air and in the medium, where one examines the effects of extremal working conditions and the electrochemical conditions at the crack tip.Karpenko Physicomechanics Institute, Ukrainian Academy of Sciences, L'viv. Translated from Fiziko-Khimicheskaya Mekhanika Materialov, Vol. 29, No. 2, pp. 33–42, March–April, 1993. 相似文献
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Electrochemical preparation of protective oxide coatings on titanium surgical alloys 总被引:1,自引:0,他引:1
M. Shirkhanzadeh 《Journal of materials science. Materials in medicine》1992,3(5):322-325
This paper reports a novel electrochemical method for the preparation of protective titanium oxide coatings to improve the corrosion resistance and biocompatibility of the Ti6A14V surgical alloy. Scanning electron microscopy (SEM), electron dispersive spectroscopy (EDS), Auger electron spectroscopy (AES), and the X-ray diffraction technique were used to characterize the structure and the chemical composition of the oxide coatings.In vitro electrochemical corrosion studies were also conducted to assess the effectiveness of the oxide coatings in reducing the metal-ion release from Ti6A14V. The results suggest that the coating process may provide an effective means for improving the corrosion resistance and biocompatibility of titanium surgical alloys under physiological conditions. 相似文献