Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
11 Cards in this Set
- Front
- Back
|
What is corrosion? |
The chemical or electrochemical reaction between a material, usually metal and non metal, and its environment that produces a deterioration of material and its properties |
|
|
What things are needed for corrosion? |
Difference in electrical potential Anode and cathode Electrolyte CONNECTION |
|
|
Where are electrons lost? |
Anode - where oxidation occurs |
|
|
Where are electrons gained? |
Cathode - where reduction occurs |
|
|
What is galvanic corrosion also referred to as? |
Dissimilar metal corrosion |
|
|
How does the potential difference affect corrosion? |
The higher the difference in potential, the faster the corrosion rate |
|
|
What else can affect corrosion rate? |
Corrosion environment Area of electrode Distance between the electrode |
|
|
How does area effect corrosion rate? |
If anode has a much smaller area, the current density will be much higher; and the anode will suffer enhanced corrosion |
|
|
Is large anode and small cathode good? Is small anode and large cathode good? |
Yes No |
|
|
How does a coating protect a substrate? |
Acts as a cathode - not as reactive to corrosive environment. Noble coatings get corroded away before the material. |
|
|
What does debris do to a substrate? |
Inert debris can protect an area causing the surroundings to become anodic |
