Intergrannular corrosion of light 18-8 stainless steel can not be prevented by
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Metallurgical Engineering · all questionsElectrometallurgy and Corrosion
Electrometallurgy and Corrosion
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Which of the following metals is highest noble in the Galvanic series?
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Difficult to monitor and very dangerous form of corrosion
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Based on the standard galvanic series, select the correct sequence of metals in the increasing order of anodic behaviour:
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Corrosion of metals involves
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Match the form of corrosion in Group 1 with the typical examples in Group 2.
| Group 1 | Group 2 |
| P. Filiform corrosion | 1. Austenitic stainless steel in chloride environment |
| Q. Crevice corrosion | 2. Nut bolt with gasket |
| R. Galvanic corrosion | 3. Painted food cans |
| S. Stress corrosion cracking | 4. Steel studs in copper plate |
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The difference in reversible potential between oxygen reduction reaction and hydrogen evolution reaction of any pH in an aqueous electrolyte is . . . . . . . . volt.
[Given, standard reduction potentials for hydrogen evolution reaction, and oxygen reduction reaction : Also PH2 = PO2 = 1 atm]
[Given, standard reduction potentials for hydrogen evolution reaction, and oxygen reduction reaction : Also PH2 = PO2 = 1 atm]
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Zinc rod is immersed in dilute HCl (pure). If a very small amount of FeCl3 is added to the solution, the corrosion rate of zinc
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Which of these metals can not be electroplated from aqueous electrolyte?
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The oxygen activity in a liquid metal can be-measured by a concentration cell using stabilised zirconia electrolyte PO2(1) | ZrO2 based solid electrolyte | PO2(2)
Where, PO2(1) is the reference oxygen pressure and PO2(2) is the oxygen pressure in equilibrium with liquid metal. If, F is Faraday constant, the EMF of the cell is equal to
Where, PO2(1) is the reference oxygen pressure and PO2(2) is the oxygen pressure in equilibrium with liquid metal. If, F is Faraday constant, the EMF of the cell is equal to
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A metal is electrochemically polarised to a potential which is higher than the standard reduction potential of the metal. The overvoltage will be
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The difference in potential between two standard half cells is ΔE°. If the half cell are galvanically coupled, the value of ΔE°, with changes in concentration of ions in the solution, is such that
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In electrolytic refining of nickel (Ni), the anode is Cu-10 atom% Ni and the cathode is pure Ni. Assuming the Cu-Ni solution to be ideal, the absolute value of the minimum voltage (in mv) required for refining is.
Given, Faraday's constant = 96490 C mole-1, Temperature = 300 K, R = 8.314 J. mol-1. K-1
Given, Faraday's constant = 96490 C mole-1, Temperature = 300 K, R = 8.314 J. mol-1. K-1
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Which of the following metals is lowest active in the electrochemical series?
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Which of the following metals is lowest noble in the Galvanic series?
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Match the following:
| P. Dezincification | 1. Reactivation |
| Q. Flade potential | 2. Stainless steel |
| R. Intergranular corrosion | 3. Polarisation |
| S. Tafel relationship | 4. Brasses |
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When P-B ratio is less than 1
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Identify the correct combination of the following statements.
P. Hydrogen electrode is a standard used to measure redox potentials.
Q. Activation polarization refers to electrochemical process controlled by reaction sequence at metal-solution interface.
R. Potential-pH diagrams can be used to predict corrosion rates of metals.
S. Cathodic protection can use sacrificial anodes such as magnesium.
P. Hydrogen electrode is a standard used to measure redox potentials.
Q. Activation polarization refers to electrochemical process controlled by reaction sequence at metal-solution interface.
R. Potential-pH diagrams can be used to predict corrosion rates of metals.
S. Cathodic protection can use sacrificial anodes such as magnesium.
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Corrosion fatigue
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Chemical formula of Rust is,
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