. What is polarization and which parameter is used to define polarization values
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Question
. What is polarization and which parameter is used to define polarization values? 2. What is the physical meaning of anodic and cathodic polarization and how they represent themselves in the electrode potential shift? 3. When activation polarization occurs? Is it applicable to oxidation or reduction? 4. When concentration polariz. occurs? Is it applicable for oxidation or reduction? 5. Which main physical condition is used in finding corrosion rates from polarization curves? 6. A large anode has high corrosion current () but lower corrosion current density (), a smaller anode has small / but high i. Which one has faster corrosion rate? 7. Describe passivation process and relate it to the three main characteristic regions on passivation polarization curve. 8. How temperature and electrolyte velocity influence corrosion rate? 9. What leads to the formation of anodic regions in an oxygen concentration cell? 10. Describe the corrosion mechanism and suggest it prevention: uniform attack, galvanic corrosion, crevice corrosion, pitting corrosion, intergranular corrosion, selective leaching, erosion-corrosion, stress-corrosion.Explanation / Answer
In chemical compounds covalent bond one molecule gets positive charge other get negative charge
For example in HCl H gets positive change and Cl gets negative charge
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