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14 Cards in this Set
- Front
- Back
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What are the two modes of material degradation in metals |
Dissolution and oxidation |
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Dissolution |
Material loss due to corrosion and scaling of the material |
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Oxidation |
Formation of oxides usually results in weight gain |
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What is the fundamental principle for metals that corrode or oxidize? |
The need to transfer electrons |
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What must there be in order for corrosion to proceed? |
There must be at least one anode and one cathode |
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The greater the voltage the ... |
Higher the tendency to corrrode |
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What type of metals are unreactive and inert? |
Noble metals |
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What type of metals are anodic and able to transfer electrons? |
Active metals |
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What does S.H.E stand for? |
Standard hydrogen electrode |
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What is s.h.e used for? |
comparing the reduction of oxidation potentials for different metals |
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What is the slowest step in a proceeding reaction? |
Rate determining step |
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What is the difference between the theoretical and actual values called? |
Overvoltage |
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What is W in the corrosion rate formula and what are its units? |
Amount of material lost in mg |
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Why will electrode potentials not be acheived in real life? |
Because of electrolyte in homogeneity or electrode material in homogeneity |
