MET 34800 - Engineering Materials - Chapter 6

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

Info icon This preview shows pages 1–18. Sign up to view the full content.

View Full Document Right Arrow Icon
MET 34800 – ENGINEERING MATERIALS IUPUI ENGINEERING TECHNOLOGY ENT Department
Image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
CHAPTER 6 CORROSION Engineering Materials: properties and selection, 9th ed. Kenneth G. Budinski, Michael K. Budinski
Image of page 2
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
Image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
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
Image of page 4
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
Image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
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
Image of page 6
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
Image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Figure 6–4 Sketch of the arrangement for measuring the half-cell potential of zinc 6.1 THE NATURE OF CORROSION 8
Image of page 8
Figure 6–5 Oxide film as an electrolyte 6.1 THE NATURE OF CORROSION 9
Image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Nature of the material Metallurgical factors segregation cold work inclusions passivity Environment Polarization Summary 6.2 FACTORS AFFECTING CORROSION 10
Image of page 10
Figure 6–6 Metallurgical factors that can affect corrosion 6.2 FACTORS AFFECTING CORROSION 11
Image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
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
Image of page 12
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
Image of page 13

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Figure 6–8 Concentration polarization 6.2 FACTORS AFFECTING CORROSION 14
Image of page 14
Figure 6–9 Factors affecting corrosion 6.2 FACTORS AFFECTING CORROSION 15
Image of page 15

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
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
Image of page 16
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
Image of page 17

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 18
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern