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The mechanism of corrosion and corrosion control of aluminum/graphite metal matrix composites.

机译：铝/石墨金属基复合材料的腐蚀机理和腐蚀控制。

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摘要

The mechanism of corrosion and corrosion control of aluminum/graphite metal matrix composites (MMC) have been investigated. Based on the results of salt fog and immersion exposures, anodic and cathodic electrochemical polarizations, and galvanic coupling experiments of the MMC and their constituents, the rapid disintegration of the composites was found to be unambiguously attributable to oxygen reduction on the graphite fibers.; The corrosion mechanism is divided into the three following steps: Stage I--the penetration of the corrosive environment into the interior of the MMC caused by (a) pitting of the foil, (b) mechanical or processing surface defect, or (c) capillary wicking of the solution down exposed fibers; Stage II--galvanic corrosion of the aluminum at the G/Al interface driven by the reduction of oxygen on the graphite fibers; Stage III--corrosion/mechanical rupture of the MMC caused by wedging of the hydrated corrosion products (formed in Stage II) in the confined spaces of the MMC.; The kinetics of oxygen reduction on fibers are decreased by silica coatings and silicon rich surface modified layers and are increased by both copper and nickel coatings. The galvanic corrosion rate of G/Al MMC is significantly reduced by silica coatings and silicon rich surface modified layers on the graphite fibers.
机译：研究了铝/石墨金属基复合材料（MMC）的腐蚀机理和腐蚀控制。基于盐雾和浸没暴露，阳极和阴极电化学极化以及MMC及其成分的电偶合实验的结果，发现复合材料的快速崩解明确地归因于石墨纤维上的氧还原。腐蚀机理分为以下三个步骤：第一阶段-由（a）箔的点蚀，（b）机械或加工表面缺陷或（c）腐蚀环境渗透到MMC内部溶液通过毛细管芯吸向下暴露的纤维；第二阶段-在G / Al界面处铝的电化腐蚀，这是由石墨纤维上的氧气还原引起的;第三阶段-由MMC密闭空间中水合腐蚀产物（在第二阶段形成）的楔入引起的MMC腐蚀/机械破裂;二氧化硅涂层和富含硅的表面改性层降低了纤维上的氧还原动力学，铜和镍涂层均提高了动力学。石墨涂层上的二氧化硅涂层和富含硅的表面改性层可显着降低G / Al MMC的电偶腐蚀速率。

著录项

  • 作者

    Dash, Lawrence Christopher.;

  • 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 229 p.
  • 总页数 229
  • 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

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