Overview

Bringing together the latest research this book applies new modelling techniques to corrosion issues in aircraft structures. It describes complex numerical models and simulations from the microscale to the macroscale for corrosion of the aluminium (Al) alloys that are typically used for aircraft construction, such as AA2024. The approach is also applicable to a range of other types of structures, such as automobiles and other forms of ground vehicles. The main motivation for developing the corrosion models and simulations was to make significant technical advancements in the fields of aircraft design (using current and new materials), surface protection systems (against corrosion and degradation) and maintenance. The corrosion models address pitting and intergranular corrosion (microscale) of Al alloys, crevice corrosion in occluded areas, such as joints (mesoscale), galvanic corrosion of aircraft structural elements (macroscale), as well as, the effect of surface protection methods (anodisation, corrosion inhibitor release, clad layer, etc.). The book describes the electrochemical basis for the models, their numerical implementation, and experimental validation and how the corrosion rate of the Al alloys at the various scales is influenced by its material properties and the surface protection methods. It will be of interest to scientists and engineers interested in corrosion modelling, aircraft corrosion, corrosion of other types of vehicle structures such as automobiles and ground vehicles, electrochemistry of corrosion, galvanic corrosion, crevice corrosion, and intergranular corrosion.

Full Product Details

Author:   J. A. DeRose ,  T. Suter ,  T. Hack
Publisher:   WIT Press
Imprint:   WIT Press
Dimensions:   Width: 15.60cm , Height: 1.50cm , Length: 23.40cm
Weight:   0.540kg
ISBN:  

9781845647520

ISBN 10:   1845647521
Pages:   200
Publication Date:   10 December 2012
Audience:   College/higher education ,  Postgraduate, Research & Scholarly
Format:   Hardback
Publisher's Status:   Active
Availability:   In stock  
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Table of Contents

Contents Section 1Introduction and Overview Introduction and Overview Motivation; Objectives; Participants in model development; Summary and conclusions; Impact and intentions for use Section 2Definition of Parameters Needed for Modelling and Simulation of Aluminium Alloy Corrosion in Aircraft Environments Subsection 2aBasic Needs and Parameters for Aluminium Alloy Corrosion Modelling as Applied in the Aviation Industry Introduction; Relevant aircraft needs to be considered for modelling and simulation; Main geometrical and material input parameters for corrosion simulation; In-service behaviour; Reasonable assumptions for boundary conditions; Other aspects to consider in modelling and simulation; Conclusions Subsection 2bMicroscopic and Macroscopic Characterisation of an Aerospace Aluminium Alloy (AA2024) Introduction; Experimental methods; Al 2024 alloy composition; Sample preparation; Electrochemical measurements; Microstructural analysis; Results and discussion; Al 2024 microstructure: intermetallic particles and matrix; S and phase precipitates; AlCuFeMnSi (second phase) particles; Matrix; Statistical analysis of the particles; Al 2024 corrosion properties; Microscale electrochemical measurements (micropolarisation curves); Difference in localised corrosion between the Al 2024 alloys (low Mg versus the more common composition); Variation in potential values measured with micropolarisation curves; Conclusions Section 3Modelling and Simulation of Aluminium Alloy Corrosion in Aircraft Environments at the Microscopic, Mesoscopic, and Macroscopic Scales Subsection 3aModelling of the Aluminium Alloy AA2024 at the Microscale: Pitting and Intergranular Corrosion Introduction; MITReM for localised corrosion of Al 2024; Boundary conditions; Onset of localised corrosion; Model specifications; Results and discussion; MTM for a deep, narrow crevice in Al 2024; Experimental input; Model geometry; Boundary conditions; Homogeneous solution chemistry; Results; Stationary analysis; Time-dependent analysis; Achievements: model benefits; Conclusions Subsection 3bModelling of the Aluminium Alloy Al 2024 from the Microscale to the Macroscale: Intergranular Corrosion Introduction; Materials and experiment; Material; Experimental details and results; Grain boundary (GB) angle and electron backscattered diffraction (EBSD) measurements; Coupon testing; Modelling; Cellular automaton (CA) modelling approach; Model; Role of model parameters; Optimisation by differential evolution (DE); Validation of model; Conclusions Subsection 3cModelling of an Aluminium Alloy at the Mesoscale: Crevice Corrosion Introduction; Context; State of the art of aluminium corrosion in confined media; Simulation approach; Mathematical background; Chemical and electrochemical reactions; Choice of the representative geometries for simulation; Results; Simulation for a one-sided aluminium crevice : 2-D side view; Simulation for a one-sided aluminium crevice : 2-D top view; Instrumented cavities of medium size; Experimental set-up; Results and discussion; Experimental results for Al 2024; Comparison between simulation and experiment; Possible application of the developed models; Conclusions Subsection 3dMacroscale Galvanic Corrosion Modelling of an Aluminium Alloy Introduction; Corrosion risk in aircraft structures; Galvanic corrosion model; Modelling approach; Validation; Deep electrolyte environment; Case Scenario 1; Case Scenario 2; Deep electrolyte summary; Thin electrolyte environment; Electrochemical input; Experimental theoretical background; Experimental procedures; Results; Simulation results; Validation; Thin film discussion; Thin film summary; Localised coating damage; Experimental and modelling procedures; Methodology; Modelling approach; Results; Summary; Galvanic corrosion applications; Case Study 1; Case Study 2; Conclusions Section 4Investigation of Corrosion Prevention Methods for Aluminium Alloy Aircraft Structures Subsection 4aThe Effect of Local Cladding on Aluminium Alloy Corrosion Introduction; Experimental investigation and results; Corrosion evaluation of the unprotected material; Corrosion damage with simple local cladding patterns; Effect of scale on the protection performance of a clad spot and statistical analysis of the corrosion damage; Validation of a clad pattern; Conclusions Subsection 4bEffect of Surface Treatment, Anodisation, and Inhibitors on Corrosion of the Aluminium Alloy AA2024 Introduction; Experimental methods; Al 2024 sample preparation; Microstructure analysis; Pretreatment and anodisation of Al 2024-T3; Pretreatment; Anodisation; Combined pretreatment and anodisation; Electrochemical measurements; Corrosion inhibitors; Sample preparation; Electrochemical measurements; Results and discussion; Pretreated Al 2024; Pretreated and anodised Al 2024; Effect of pretreatment and anodisation on corrosion behaviour of Al 2024; Inhibitors; Conclusions Section 5Decision Support Tool for Aluminium Alloy Corrosion in Aircraft Environments Decision Support Tool for Aluminium Alloy Corrosion in Aircraft Environments Introduction; Decision support tool objectives; Simulation models incorporated in the DST; Integration approach; Input data for aircraft structures; Galvanic simulation; Parametric models; Documentation and reports; Case study optimisation of surface protection; Case study defect in protection system; Conclusions Section 6Impact on Industry Impact on Industry Use of corrosion modelling and simulation methods in industry; Use in the aeronautics industry; Contributions to standards, education, and training; Application of the results in other industries; Conclusions

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