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Daily Quiz (72)


True or false: One way to passivate steel is to remove its oxide layer.


The surface temperature of steel should be how much higher than the dew point temperature before you blast clean or paint?


True or false: The adhesion of a coating to a steel substrate depends entirely upon the mechanical attachment or hooking of the coating to the profile of the steel.


True or false: A black light test can detect certain oil films on a bare steel substrate.


What organization publishes the Standard for the Preparation of Steel Substrates for PSPC?


What is the process called when steel shot is used to improve the fatigue properties of steel?


What is the name of the contacting surfaces of joints in steel structures formed with the use of high-strength bolts?


Which of the following methods for measuring surface profile is not described in ASTM D4417, “Standard Test Method for Field Measurement of Surface Profile of Blast Cleaned Steel”?


What is another name for the portable stylus instrument used to measure surface roughness of blast-cleaned steel?


True or False: Both zinc and aluminum are used as thermal spray materials for corrosion protection of steel.


What generic type of topcoat is often claimed to enable a two-coat system rather than a conventional 3-coat system (zinc, epoxy, polyurethane) for corrosion protection of steel?


What description fits Initial Condition D of steel before blasting?


True or False: SSPC’s membership rolls grew from 100 individual members at its founding in 1950 to its current 9,829 individual members (as of July 31, 2013).


What is another term for surface profile on steel?


True or false? Under certain conditions, weathering steel may require painting to protect it from corrosion.


What type of corrosion is characterized by a definite thread-like structure and directional growth under coatings on steel?


True or false: SSPC visual standards showing degrees of cleaning of steel take precedence over the descriptions of required cleanliness in SSPC’s written surface preparation standards.


Which of the following SSPC abrasive blast cleaning standards requires the most rigorous degree of cleaning of steel?


Why should the surface temperature of steel be at least 5 degrees higher than the dew point temperature before you blast-clean or paint?


What is the common name of high-strength, low-alloy steel that provides greater resistance to atmospheric corrosion than conventional carbon steel?


True or false: The number of surface profile peaks in abrasive-blast-cleaned steel has no effect on coating performance.


What is the main feature of zinc that allows it to provide cathodic protection to steel?


True or false: The standard for non-destructive measurement of dry coating film thickness on concrete is different from the one used to measure dry coating film thickness on steel.


True or false: Thermal spraying of zinc is sometimes used for corrosion control on steel substrates.


SPC-VIS 1, Visual Standards for Blast Cleaned Steel, was initially the product of another standards-writing body. Which one?


Which of the following cleaning techniques is most likely to remove soluble salts from a heavily pitted steel surface?


True or false: A research study by Roper, Weaver, and Brandon indicated that the number of peaks in a steel surface profile created by abrasive blasting has no effect on performance of coatings applied to the steel.


True or false: Fire-resistant, intumescent coatings for steel are applied in one to three coats.


When water under pressures of 30,000-40,000 psi is used to clean steel before painting, what is this form of cleaning called?


If you’re a contractor concerned with meeting the end condition appearance requirements for steel after blast cleaning, what precaution might you take?


Power tools such as power wire brushes can burnish or polish a steel surface. Why is this a problem?


According to SSPC's Surface Preparation Commentary for Steel and Concrete Substrates (SSPC-SP COM), final dry blast cleaning should not be conducted when the steel surface is less than how many Fahrenheit degrees above the dew point?


True or false: Thermal spray coatings of aluminum, zinc, and their alloys for corrosion protection of steel are very surface-tolerant.


True or false: Painting over weld spatter on steel is an accepted practice.


A high-strength, low-alloy steel that provides greater resistance to deterioration from atmospheric corrosion than conventional carbon steel has what generic name?


In its Technology Guide on the subject, what type of coating material does SSPC recommend for repairing imperfections in galvanized, organic zinc-, or inorganic zinc-coated steel?


True or false: A combination of chemical stripping and (frozen) ice blasting has been used to remove lead-based paint from bridge steel.


What is the typical pressure range for water jetting when it is used to remove coatings and corrosion from structural steel?


Among the options below, which is the most important in achieving the specified surface profile on steel when you are air abrasive blast cleaning?


True or false: If you are removing a soft, pliable coating from a steel surface, a rounded abrasive will be more productive than an angular one.


How can sponge blasting produce a profile on steel?


What happens to the existing profile on steel when UHP water blasting is used to remove rust and/or coatings?


When does mill scale form on steel?


Which of the following elements of design of steel structures is most likely to promote corrosion?


True or false: Abrasive blasting and other scarification techniques increase the surface area of a steel substrate and provide additional reactive sites for molecular association between paint and metal.


Which technique would be least likely to remove soluble salts from a steel substrate?


Which of the following is most likely to be the result of excessive profile depth on steel after blast cleaning?


Why is a black light test used on a bare steel substrate?


What are the conditions necessary for corrosion of steel to occur?


Which of the following factors influences the appearance of steel after blast cleaning?


How does a dry film thickness measurement of a coating on steel take into account the blast profile on the steel?


Power tools, such as power wire brushes, can burnish or polish a steel surface. What is the main problem with this?


Which one of the following generic coating types protects steel from corrosion by sacrificial action?


Which of the following cleaning techniques is least likely to remove soluble salts from a steel surface?


Sharp edges on steel present special challenges to the coating applicator for what reason?


True or false: ASTM has separate test methods for steel and concrete substrates in determining the pull off adhesion of coatings.


How can air abrasive blasting with sponge media create a profile on steel?


Power tools such as power wire brushes can burnish or polish a steel surface. Why is this sometimes a problem?


What is most likely to help you achieve the specified profile on the steel you are blast cleaning?


True or false: Any kind of metal can be used in coatings for sacrificial protection of steel.


True or false: Permanent sheet pile structures are sometimes left uncoated in corrosive environments because thicker steel, rather than coatings, is used to assure design life.


Which of the following types of coatings are normally used on the faying surfaces of steel joints?


Which of the following is not used for measuring the surface profile of cleaned steel?


True or false: SSPC visual standards showing degrees of cleaning of steel take precedence over the descriptions of required cleanliness in SSPC's written surface preparation standards.


True or false: In protective coatings work, "smut" refers to the metallic fines that cling to a steel substrate after it is cleaned with metallic abrasive.


True or false: When steel freshly cleaned by air abrasive blasting is exposed to conditions of high humidity, moisture, or a corrosive atmosphere, the discoloration that occurs is called "rust back."


The oxide layer formed on steel during manufacture is called what?


What is the name of the roughened surface created on steel by abrasive blast cleaning?


Which of the methods/instruments below are used to measure surface profile of blast-cleaned steel?


True or false: weathering steel is designed for use in boldly exposed applications where there are regular wetting and drying cycles.


Which of the following can be a driving force for water absorption through a paint film to a steel substrate?


True or False: SSPC-SP 16 covers electrochemical stripping of coatings from steel substrates.


 
 
   

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