Surface Lamination {Ans: The most common surface defect on steel substrates. It is typically caused by rolling the steel.}High-Voltage Pulse-Type DC Holiday Detector {Ans: This instrument is ideal for use in moist conditions. Pass the electrode over the surface. A spark will arc through the air gap at any hol- idays, voids, or discontinuities, causing the detector to emit an audible sound.}Crevice Corrosion {Ans: Localized corrosion of a metal surface at, or immediately adjacent to, an area that is shielded from full exposure to the environment because of close proximity of the metal to the surface of another material.}Psychrometric Tables {Ans: Booklet used to determine the relative humidity and dew-point temperature of the air.}Crushed Slag {Ans: Relatively cheap abrasives that are formed from metallurgical processes or combustion. Copper-, nickel-, coal-, and aluminum-slag are common.}Nitrates {Ans: Nitrates are salts of nitric acid with an ion composed of one nitrogen and three oxy- gen atoms (NO−3).}