The Statue of Liberty - Elsevier

The Statue of Liberty - Elsevier

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

1 The Statue of Liberty Chapter 16 Corrosion and Wear 2

Dissolution of Iron in Water Equilibrium: Fe++ - 2e- double layer establishes E potential that stops the dissolution. Chapter 16 Corrosion and Wear 3

Cell Potential The 2 metals have different tendencies (G) to dissolve Chapter 16 Corrosion and Wear 4 Effect of Electrode Area

Cathode area must be kept small to avoid corrosion of the anode Chapter 16 Corrosion and Wear 5 Cathodic Protection

A: By more anodic material B: By applied potential Chapter 16 Corrosion and Wear 6

Cathodic Protection of a Ship Chapter 16 Corrosion and Wear 7 Corrosion in a Single Metal

Local variations in electrolyte or metal form electrolytic cells Chapter 16 Corrosion and Wear 8 Concentration Cell Chapter 16 Corrosion and Wear

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

10 Oxygen Concentration Cell Chapter 16 Corrosion and Wear 11

Crevice Corrosion A: Anode, C: Cathode Chapter 16 Corrosion and Wear 12 Corrosion by Chlorine

Pitting Corrosion of Stainless Steel Chapter 16 Corrosion and Wear 13 Corrosion by Chlorine

Corrosion of aluminum in atmosphere with salt water Chapter 16 Corrosion and Wear 14 Corrosion of Rubber Swelling and cracking by exposure to HCl

Chapter 16 Corrosion and Wear 15 Cavities due to Hydrogen Unalloyed Iron in water with CO2 Chapter 16 Corrosion and Wear

16 Ammonia Corrosion Chapter 16 Corrosion and Wear 17

Designing to Avoid Corrosion Chapter 16 Corrosion and Wear 18 Dry Oxidation

Metal A: Metal migrates more rapidly Metal B: Oxygen migrates more rapidly

Chapter 16 Corrosion and Wear 19 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 20 Erosion Changes of erosion rate with impact angle

Chapter 16 Corrosion and Wear 21 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 22

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