Environmental Interactions Chapter 16

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Presentation transcript:

Environmental Interactions Chapter 16 Corrosion and Wear Materials Science for Engineering Students – Traugott Fischer - © 2009

Chapter 16 – Corrosion and Wear The Statue of Liberty Chapter 16 – Corrosion and Wear

Dissolution of Iron in Water Equilibrium: Fe++ - 2e- double layer establishes E – potential that stops the dissolution. Chapter 16 – Corrosion and Wear

Chapter 16 – Corrosion and Wear Cell Potential The 2 metals have different tendencies (DG) to dissolve Chapter 16 – Corrosion and Wear

Effect of Electrode Area Cathode area must be kept small to avoid corrosion of the anode Chapter 16 – Corrosion and Wear

Chapter 16 – Corrosion and Wear Cathodic Protection A: By more anodic material B: By applied potential Chapter 16 – Corrosion and Wear

Cathodic Protection of a Ship Chapter 16 – Corrosion and Wear

Corrosion in a Single Metal Local variations in electrolyte or metal form electrolytic cells Chapter 16 – Corrosion and Wear

Chapter 16 – Corrosion and Wear Concentration Cell Chapter 16 – Corrosion and Wear

Acid Corrosion Bronze impeller in 1% sulfuric acid Chapter 16 – Corrosion and Wear

Oxygen Concentration Cell Chapter 16 – Corrosion and Wear

Chapter 16 – Corrosion and Wear Crevice Corrosion A: Anode, C: Cathode Chapter 16 – Corrosion and Wear

Corrosion by Chlorine Pitting Corrosion of Stainless Steel Chapter 16 – Corrosion and Wear

Corrosion by Chlorine Corrosion of aluminum in atmosphere with salt water Chapter 16 – Corrosion and Wear

Corrosion of Rubber Swelling and cracking by exposure to HCl Chapter 16 – Corrosion and Wear

Cavities due to Hydrogen Unalloyed Iron in water with CO2 Chapter 16 – Corrosion and Wear

Chapter 16 – Corrosion and Wear Ammonia Corrosion Chapter 16 – Corrosion and Wear

Designing to Avoid Corrosion Chapter 16 – Corrosion and Wear

Chapter 16 – Corrosion and Wear Dry Oxidation Metal Metal A: Metal migrates more rapidly B: Oxygen migrates more rapidly Chapter 16 – Corrosion and Wear

Stresses in Oxide Coatings Upon Cooling Natural size when cold Stresses upon cooling Failure of coating Coating and Metal are unstressed at high temperature Thermal expansion of coating A: larger, B: smaller than for metal Chapter 16 – Corrosion and Wear

Erosion Changes of erosion rate with impact angle Chapter 16 – Corrosion and Wear

Chapter 16 – Corrosion and Wear Cutting Metals A: Metal is cut by plastic (shear) deformation B: Typical temperatures in metal and tool C: Wear patterns in tools Chapter 16 – Corrosion and Wear

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