Term
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Definition
| Iron and steel combine with other chemical elements to return to their lower energy states. Moisture, salts, and certain temperatures speed up the corrosion. |
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Term
| Name 3 of the 5 types of corrosion |
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Definition
Uniform
Galvanic
Pitting
Crevice
Stray |
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Term
| Define galvanic corrosion |
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Definition
| Galvanic corrosion is a quick form of corrosion that occurs when two very different metals are in close contact. |
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Term
| When does crevice corrosion occur? |
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Definition
| It occurs when there is less oxygen available inside the crevice than is outside of it, especially if the crevice is wet. |
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Term
| When does stray current corrosion occur? |
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Definition
| It occurs when there is an electrical current flowing near a structure that is buried underground or placed under water or in another liquid. |
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Term
| What is the best way to prevent current corrosion? |
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Definition
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Term
| List 3 of the 5 methods of preventing and controling corrosion. |
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Definition
Protective coatings
Cathodic protection
Good design
Materials selection
Change of environment |
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Term
| What are the two main types of protective coatings? |
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Definition
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Term
| What are the three steps to prepare a surface to be painted? |
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Definition
Pre-Cleaning
Cleaning
Post-Cleaning |
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Term
| List some things that you need to do during the pre-cleaning of a surface |
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Definition
Identify and repair defects
Remove grease, oil, salts water, loose chalking, etc. |
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Term
| List some thing that you need to do during the cleaning stage to prepare a surface |
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Definition
| Refer to the job contract or specifications to see how clean the item needs to be. It will generally include removing rust and mill scale in order to create a surface profile. |
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Term
| List some things that you need to do during the post-cleaning stage to prepare a surface |
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Definition
Identify and correct defects
Make sure the surface is dry, free of contaminants, and that the level of cleanliness still meets the required cleanliness level specified in the contract. |
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