NACE CP1 Book Chapters 5-10 Questions and Answers (Graded A+)

In complex structures, always select materials that are ____ each other in the galvanic series that will exhibit ____ voltage differences - ANSWER-near, little to no What is the first line of defense in corrosion control programs? - ANSWER-coating If the structure is coated, it is necessary to protect only the metal exposed at ____ - ANSWER-holidays Pipeline coatings designed for underground use do not have good resistance to ____ light, so ____ is to be avoided - ANSWER-UV, sunlight Coatings formulated from coal tar pitch or natural asphalt, reinforced with glass and a felt wrapper, used less today because of toxicity - ANSWER-bituminous enamels Coatings that consist of polyolefin or polyethylene extruded over butyl or asphalt mastic adhesive, high impact resistance and resist holiday development - ANSWER-extruded polyolefin and polyethylene Coatings that consist of a primer, corrosion sealant inner layer, mechanical protective outer layer backing (usually polyethylene or polybutylene), prone to disbonding if not properly tensioned - ANSWER-tape coatings Coatings that consist of powdered resin electrostatically sprayed onto heated pipe, moisture absorption can be a problem - ANSWER-fusion boned epoxy (FBE) Coatings that consist of liquid resin (epoxy) and a curing agent, resistant to impact and abrasion damage - ANSWER-two-component liquid resin coatings (two part epoxy) What is essential for the coating to bond properly to the metal? - ANSWER-proper surface preparation and application (hot or cold) What environmental conditions must be checked during initial inspection before coating application? - ANSWER-temperature, humidity, dew point What should be checked for visually during coating application? - ANSWER-disbonding, damage, checking, cracking, chalking, etc. (check if reconditioning is required) Why are inhibitors added to liquids? - ANSWER-to change the characteristics of the liquid or form protective films on the metal surface How does sunlight exposure affect a coating? - ANSWER-changes porosity, brittle (changes properties) What are the following materials used for: heat shrink sleeves, hot and cold applied tapes, two-component liquid resins, coal tar mastics, fusion bonded epoxy? - ANSWER-girth weld coatings