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首页> 外文学位 >THE MODELING OF GALVANIC CORROSION SYSTEMS USING NUMERICAL METHODS WITH PARTICULAR ATTENTION TO BOUNDARY CONDITIONS OF NONLINEAR POLARIZATION (ELECTROCHEMISTRY, FINITE-ELEMENT METHODS).
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THE MODELING OF GALVANIC CORROSION SYSTEMS USING NUMERICAL METHODS WITH PARTICULAR ATTENTION TO BOUNDARY CONDITIONS OF NONLINEAR POLARIZATION (ELECTROCHEMISTRY, FINITE-ELEMENT METHODS).

机译：电偶腐蚀系统的建模使用数值方法，特别注意非线性极化的边界条件（电化学，有限元方法）。

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摘要

The objective of this research was to develop a method for a-priori quantitative prediction of electrochemical potential and current distributions in systems of dissimilar metals submerged in an electrolyte, the motivation being mitigation of corrosion effects by material selection, geometric configuration, and cathodic protection design. Specificially, the method would employ existing numerical techniques for solving the Laplace equation, applying them in an electrochemical analysis technique for any specified geometry of electrodes having known electrode kinetics. Particular emphasis was placed on characterization of electrodic behavior using analytical expressions to represent the boundary conditions while retaining physical significance.;A particular finite element formulation was developed to preserve charge conservation, a required condition to include mixed potential theory in electrochemical modeling. The mathematics analogy between electrical and thermal conduction was identified and a commercially-available heat conduction computer program was selected and modified for electrochemical analysis by programming for the particular boundary conditions representing nonlinear electrode kinetics.;The method of galvanic modeling and analysis was demonstrated by the several examples. One problem simulated one of simple geometry and idealized linear electrode kinetics previously solved exactly in the literature. Two problems with measured results for correlation were solved, one of a laboratory-scale experiment with two dissimilar metals submerged in the electrolyte, and a second of a macroscopic field problem of a shipboard seawater tank with the electrolyte enclosed by wetted metals. All three demonstration problems predicted electrochemical potential distributions in very good agreement with the exact solution or measured results.;It was concluded that the electrochemical modeling method developed in this research embodies both mixed potential theory and full electrodic behavior of metal/electrolyte systems with demonstrated accuracy.;A literature search examined analytical and graphical methods of the past half-century and numerical methods which began to appear in the latter 1970's. Herein, the partial differential equation governing the electric potential distribution in electrolytes was derived and unique boundary conditions representing complete nonlinear electrodics of submerged metals were developed. Modern numerical finite difference, finite element, and boundary element methods with applicability to modeling electrochemical phenomena were investigated.
机译：这项研究的目的是开发一种方法，用于对浸没在电解液中的异种金属系统中的电化学势和电流分布进行先验定量预测，其动机是通过材料选择，几何构型和阴极保护设计减轻腐蚀影响。特别地，该方法将采用现有的数值技术来求解拉普拉斯方程，将其应用于具有已知电极动力学的任何特定几何形状的电极的电化学分析技术中。特别强调了使用解析表达式表征边界条件同时保留物理意义的电极行为表征。;开发了一种特殊的有限元公式来保留电荷守恒，这​​是在电化学建模中包括混合电势理论的必要条件。通过对代表非线性电极动力学的特定边界条件进行编程，确定了电和热传导之间的数学类比，并选择并修改了市售的热传导计算机程序进行电化学分析。几个例子。一个问题模拟了简单的几何形状和理想的线性电极动力学中的一种，而先前在文献中已完全解决了这一问题。解决了两个具有相关性的测量结果的问题，一个是在实验室规模的实验中，两种不同金属浸没在电解液中，第二个是船用海水舱的宏观视野问题，电解液被湿润的金属包围。所有这三个演示问题都预测了电化学电势的分布，与精确的解决方案或测量结果非常吻合。得出的结论是，本研究开发的电化学建模方法既体现了混合电势理论，又体现了金属/电解质系统的完全电学行为，并证明了准确性。;文献检索研究了过去半个世纪的分析和图形方法以及在1970年代后期开始出现的数值方法。在此，推导了控制电解质中电势分布的偏微分方程，并开发了代表浸没金属的完整非线性电子的独特边界条件。研究了适用于电化学现象建模的现代数值有限差分，有限元和边界元方法。

著录项

  • 作者

    MUNN, RAYMOND SHATTUCK.;

  • 作者单位

    University of Connecticut.;

  • 授予单位 University of Connecticut.;
  • 学科 Engineering Materials Science.
  • 学位 Ph.D.
  • 年度 1986
  • 页码 196 p.
  • 总页数 196
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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