| 1. |
Corrosion is defined as the deterioration of a material usually a metal, because of a reaction with its environment and which requires the presence of an anode, a cathode, an electrolyte, and an electrical circuit. |
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True |
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False |
| 2. |
The basic corrosion cell consists of an anode, a cathode, an electrolyte, and a metallic path for electron flow. The corrosion current (z) enters the electrolyte at the anode and flows to the cathode. |
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True |
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False |
| 3. |
Galvanic (dissimilar metals) corrosion occurs when two electrochemically dissimilar metals are metallically connected and exposed to a corrosive environment. |
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True |
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False |
| 4. |
____________________ is a corrosion process in which one element is preferentially removed from an alloy. |
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Alloying |
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Dealloying |
| 5. |
Pitting corrosion is a randomly occurring, highly localized form of attack on a metal surface, characterized by the fact that the depth of penetration is much greater than the diameter of the area affected. |
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True |
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False |
| 6. |
Intergranular corrosion cracking describes the phenomenon that can occur when many alloys are subjected to static, surface tensile stresses and are exposed to certain corrosive environments. |
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True |
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False |
| 7. |
A schematic view showing sacrificial-anode-type cathodic protection installation for an underground steel pipeline is represented in ________________. |
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Figure 2-1 |
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Figure 2-2 |
| 8. |
The sacrificial anode type cathodic protection systems require no external power and are easy to install. |
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True |
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False |
| 9. |
Natural resins generally are cooked with drying oils to make varnishes with faster drying rates, higher gloss, and harder films than can be attained from the oil alone. |
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True |
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False |
| 10. |
Natural resins called copals are derived from fossilized or semi-fossilized vegetable remains. These resins have high carboxyl-functional hydrocarbons of high acid number and, therefore, are reactive. |
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True |
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False |
| 11. |
Cross linking reactions in urethane coatings consist of a reaction between an isocyanate containing (-N=C=O) material and a material with a polyhydroxylated (-OH) containing co reactant. |
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True |
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False |
| 12. |
The polyether prepolymer is considerably less expensive than either acrylic or polyester polyols. |
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True |
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False |
| 13. |
Portable XRF detectors are used directly on the painted surface to provide a nondestructive analysis of the amount of lead present. |
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True |
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False |
| 14. |
Spot testing using sodium sulfide is a qualitative method for determining the presence of lead. |
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True |
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False |
| 15. |
Lac is a resinous secretion of a coccid insect from India and Thailand used to make _____________. |
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Rosins |
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Shellac |
| 16. |
Steam cleaning effectively removes grease, oil, and dirt by a combination of detergent action, high pressure heated water (138 °C [280 °F] to 149 °C [300 °F] at 0.189 to 0.315 liters/sec [3 to 5 gal/min]), and impact; and it is used on both coated and uncoated surfaces. The equipment consists mainly of a pressure jet steam cleaner. |
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True |
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False |
| 17. |
Chemical stripping involves the application of an alkali, acid, or methylene chloride solution to a painted surface by spray, brush, or trowel. The solution remains on the surface for a few hours or overnight to allow the chemical reaction to take place and soften the coating. |
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True |
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False |
| 18. |
The blast pot (direct pressure machine) is the high production blast machine used in shipyards, refineries, chemical plants, and other facilities for large-scale blast-cleaning operations. The size of the blast pot is generally determined by its abrasive capacity. Therefore, the smaller the pot capacity, the more frequent filling is required. |
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True |
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False |
| 19. |
Portable electrostatic spray units are used for coating applications to odd-shaped metal objects, such as wire fencing, angles, channels, cables, and piping. Electrostatic spray units impart an electrostatic charge to the coating, which causes the material to be attracted to a properly grounded object. |
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True |
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False |
| 20. |
Leachable Levels That Result in Toxicity is represented in _____________________________. |
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Table 11-2 |
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Table 11-3 |
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