MET 34800 - Engineering Materials - Chapter 6

MET 34800 - Engineering Materials - Chapter 6 - IUPUI...

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MET 34800 – ENGINEERING MATERIALS IUPUI ENGINEERING TECHNOLOGY ENT Department
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CHAPTER 6 CORROSION Engineering Materials: properties and selection, 9th ed. Kenneth G. Budinski, Michael K. Budinski
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Upon completion of this chapter, the student should: have an insight into the nature of corrosion and its various manifestations have a knowledge of corrosion-measuring techniques Design guidelines for corrosion control CHAPTER GOALS 3
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An electrolyte Conduction path An anode Ions/cations Electrons Where these components come from in metals Cathode processes Anode process Rusting reactions Half cells Free energy as the driving force for corrosion 6.1 THE NATURE OF CORROSION 4
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Figure 6–1 Crystal structure of sodium chloride, NaCl. The chlorine anions are arranged in the cubic close-packed position. The sodium cations fill the octahedral interstitial positions 6.1 THE NATURE OF CORROSION 5
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Figure 6–2 The corrosion of iron in hydrochloric acid. As iron dissolves in the solution, excess electrons become available to react with the hydrogen ions in the acid ( corrodent ) 6.1 THE NATURE OF CORROSION 6
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Figure 6–3 Model of an electrochemical battery. When zinc is electrically coupled to carbon, the electrons liberated during the zinc oxidation process flow to the carbon cathode 6.1 THE NATURE OF CORROSION 7
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Figure 6–4 Sketch of the arrangement for measuring the half-cell potential of zinc 6.1 THE NATURE OF CORROSION 8
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Figure 6–5 Oxide film as an electrolyte 6.1 THE NATURE OF CORROSION 9
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Nature of the material Metallurgical factors segregation cold work inclusions passivity Environment Polarization Summary 6.2 FACTORS AFFECTING CORROSION 10
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Figure 6–6 Metallurgical factors that can affect corrosion 6.2 FACTORS AFFECTING CORROSION 11
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Figure 6–7 Satisfactory operating ranges for various metals in oxidizing and reducing environments. Source: Courtesy of Carpenter Technology Corp. 6.2 FACTORS AFFECTING CORROSION 12
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Operating Conditions Some of the more essential operating conditions to consider in selecting a material for corrosion resistance are the following: 1. Intended service life 2. Temperature 3. Velocity 4. Concentration 5. Impurities 6. Aeration 6.2 FACTORS AFFECTING CORROSION 13
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Figure 6–8 Concentration polarization 6.2 FACTORS AFFECTING CORROSION 14
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Figure 6–9 Factors affecting corrosion 6.2 FACTORS AFFECTING CORROSION 15
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Uniform corrosion Pitting Crevice corrosion Galvanic corrosion Stress corrosion cracking in metals EAC in plastics Intergranular attack Dealloying Erosion (liquid, slurry, cavitation) 6.3 TYPES OF CORROSION 16
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The prevention and analysis of corrosion failures require recognition of the type of corrosion that can occur in a system. Most workers in the field try to
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MET 34800 - Engineering Materials - Chapter 6 - IUPUI...

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