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The influence of interphase structure on the kinetics of oxygen reduction on graphite used in aluminum-graphite metal matrix composites.

机译：相结构对铝石墨金属基复合材料中石墨还原氧动力学的影响。

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摘要

Graphite fibers are used as reinforcement in a number of metal matrix composites. In aluminum-graphite composites this causes severe galvanic corrosion when the material is exposed to a corrosive environment. The graphite fiber surface provides active sites on which the cathodic reaction of oxygen occurs in aqueous solutions. This cathodic reaction causes enhanced aluminum matrix dissolution because of galvanic coupling. This study focussed on the oxygen reduction reaction on graphite fiber surfaces and means of inhibiting it to reduce the galvanic corrosion problem. Since the reaction is sensitive to surface active sites on graphite, the first stage of the study involved testing a variety of graphitic surfaces for activity towards oxygen reduction. Graphite fibers of different elastic moduli differed in electrochemical activity towards the oxygen reduction reaction. The kinetics of the reaction were observed to be higher on the fibers of lower elastic modulus. An explanation based on the microstructure of the graphite fibers giving rise to different numbers of active surface sites was proposed. Polarization experiments and Laser Raman Spectroscopy on the fibers were performed to develop this idea. The second stage of the research was concerned with screening tests for inhibitors for the cathodic oxygen reduction reaction. Tests were performed on oriented pyrolytic graphite surfaces and a few compounds were identified as marginally effective. Further tests with ion-implanted surfaces, implanted with a few species, were tried with no significant inhibitive effects observed on the oxygen reduction reaction. However, the results suggested possible future directions for research.
机译：石墨纤维被用作许多金属基复合材料的增强材料。在铝-石墨复合材料中，当材料暴露于腐蚀性环境时，会引起严重的电化腐蚀。石墨纤维表面提供了活性位点，水溶液中的氧发生了阴极反应。由于电流偶合，该阴极反应导致铝基质溶解增强。这项研究集中在石墨纤维表面的氧还原反应以及抑制它的方法以减少电偶腐蚀问题。由于该反应对石墨上的表面活性位敏感，因此研究的第一阶段涉及测试各种石墨表面对氧还原的活性。弹性模量不同的石墨纤维对氧还原反应的电化学活性不同。在较低弹性模量的纤维上观察到反应的动力学较高。提出了基于石墨纤维的微观结构产生不同数量的活性表面部位的解释。对光纤进行了极化实验和激光拉曼光谱分析，以发展这一想法。研究的第二阶段涉及对阴极氧还原反应抑制剂的筛选测试。在定向的热解石墨表面上进行了测试，发现一些化合物略有效果。尝试了对离子注入表面进行了进一步测试，该表面注入了几种物质，但对氧还原反应没有明显的抑制作用。但是，结果提示了未来的研究方向。

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  • 作者

    Jagannathan, Vijay.;

  • 作者单位

    The Ohio State University.;

  • 授予单位 The Ohio State University.;
  • 学科 Engineering Metallurgy.; Engineering Materials Science.
  • 学位 Ph.D.
  • 年度 1988
  • 页码 174 p.
  • 总页数 174
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 冶金工业;工程材料学;
  • 关键词

  • 入库时间 2022-08-17 11:50:49

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