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And Answers
Corrosion - correct answer ✅The deterioration of a material, usually a metal, that results from a reaction with its environment Passivation - correct answer ✅a reduction of the anodic reaction rate of an electrode involved in corrosion What are the elements of a corrosion cell? - correct answer ✅Anode, cathode, return path, electrolyte Describe what happens at the anode - correct answer ✅Is that part of the metal that corrodes (dissolves in the electrolyte). It forms positively charged ions that are conducted to the cathode. Oxidation requires a complementary reaction at the cathode. What is the function of the electrolyte - correct answer ✅A chemical substance containing ions that migrate in an electric field
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What is the function of the metallic pathway - correct answer ✅(i.e. return path) this connects the anode and cathode allowing passage of electrons generated at the anode to the cathode What is the galvanic series - correct answer ✅A list of metals and alloys arranged according to their corrosion potentials in a given environment The general rules of galvanic corrosion are: - correct answer ✅(i.e. dissimilar metal) When dissimilar metals are connected, the most active (anodic) metal corrodes more rapidly, while the more noble (cathodic) metal is better protected and coorodes less rapidly. As the potential difference increases, the rate of galvanic corrosion increases. Name at least 5 factors that affect the rate of corrosion - correct answer ✅Oxygen (lowers, lowers), temperature (lowers, lowers), chemical salts (less, less) humidity (wetter, more corrosion), pollutatnts/acid gases (lower, lower)
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What is the inspector's responsibility when it comes to safety on a project - correct answer ✅report any issues that may affect the project (safety enforcement is not the responsibility of the inspector) Name some tests that may need to be conducted during surface preparation and coating operations - correct answer ✅Humidity, dew point, surface tempt, invisible contaminants, blast hose/nozzle, surface profile, level of cleanliness, viscosity Name some of the documentation/reports that may be required to be maintained on a coatings project - correct answer ✅Daily written report, inspection log, routine reports, progress meeting minutes What are the most important characteristics of a good report - correct answer ✅what was coated, with what materials, when, how it was done, by whom, lessons learned
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What is the inspector's primary responsibility and what should the inspector not do as it pertains to the specification - correct answer ✅to clearly understand what records and reports are required and "verfity" the specification; the inspector does not make changes to the specification for any reason What type of information could you expect to find on a safety data sheet - correct answer ✅Toxicity, health effects, first aid, reactivity, storage, disposal, PPE, spill handling Explain the difference between quality assurance and quality control - correct answer ✅QA - systematic process that checks whether a product or service being developed is meeting specified requirements, QC - procedure or set of procedures intends to ensure that a manufactured product or performed services adheres to a defined set of quality criteria Identify some of the defects that can be caused by incorrect application temperatures - correct answer ✅Blistering, pin holing, cratering, dry spray, mud cracking
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Explain the process for use of the sling psychrometer - correct answer ✅Saturate the sock with clean water, whirl the instrument for 40 seconds, read the wet bulb temperature List 3 desirable properties of a coating - correct answer ✅Chemical/water resistance, adhesion, strength, impact/abrasion resistance Two broad classifications of a coating are - correct answer ✅Organic (with carbon, petroleum products) or inorganic (more head resistance What are 2 primary components of a liquid applied coating - correct answer ✅Pigment and vehicle (resin and solvent) Describe the 3 methods by which a coating provides corrosion control - correct answer ✅Resistance inhibition, oxygen deprivation
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what are the three different ways a coating can adhere to the surface - correct answer ✅Chemical, mechanical, polar Two broad classifcations for curing mechanisms are - correct answer ✅Non/convertible 2 non-convertible coating types - correct answer ✅Evaporation cure and coalescence (resin particles fuse together to form the film) 3 convertible coating curing mechanisms - correct answer ✅oxidation, co-reaction/polymerization, hydrolysis, fusion 2 characteristics of oxidation cure coatings - correct answer ✅Unsuitable for immersion service and cannot withstand an alkaline environment due to the reaction of alkaline materials with the oil portion of the resin (saponification)
