NACE CIP Level 1 Study Guide Questions And Answers

Corrosion - ANS The deterioration of a material, usually a metal, that results from a reaction with its enviroment Passivation - ANS a reduction of the anodic reaction rate of an electrode involved in corrosion What are the elements of a corrosion cell? - ANS Anode, cathode, return path, electrolyte Describe what happens at the anode - ANS 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 - ANS A chemical substance containing ions that migrate in an electric field What is the function of the metallic pathway - ANS (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 - ANS A list of metals and alloys arranged according to their corrosion potentials in a given environment The general rules of galvanic corrosion are: - ANS (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 - ANS Oxygen (lowers, lowers), temperature (lowers, lowers), chemical salts (less, less) humidity (wetter, more corrosion), pollutatnts/acid gases (lower, lower) General corrosion is - ANS distributed more or less uniformly over the surface of a material Localized corrosion is - ANS Occurs at discrete sites on the metal surface List some of the common tools/methods used for corrosion control - ANS Design - eliminate water, edges, maintainance, inhibitors, material selection, cathodic protection systems, protective coatings, alteration of environment Mill scale - ANS oxide layer formed during hot fabrication or heat treatment of metals How does NACE define the inspector's role - ANS quality control technician who is primarily responsible for observing and reporting the technical aspects of a coating project and its conformance/deviation from the spec (not supervision) What is the inspector's responsibility when it comes to safety on a project - ANS 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 - ANS 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 - ANS Daily written report, inspection log, routine reports, progress meeting minutes What are the most important characteristics of a good report - ANS what was coated, with what materials, when, how it was done, by whom, lessons learned What is the inspector's primary responsibility and what should the inspector not do as it pertains to the specification - ANS 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 - ANS Toxicity, health effects, first aid, reactivity, storage, disposal, PPE, spill handling Explain the difference between quality assurance and quality control - ANS 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 - ANS Blistering, pin holing, cratering, dry spray, mud cracking Relative humidity is - ANS the ratio, expressed as a %, of the amount of water vapor pressure in a given volume of air at a given temperature to the amount required to saturate the air at that temperature Dew point temp - ANS Temperature at which moisture will begin to form on a steel surface Name some of the effects wind may have on a coating project - ANS Blow abrasives past work area, cause excessive drift or overspray, accelerates solvent evaporation after application, contribute to the formation of dry spray What are common errors when using an electronic hygrometer - ANS Taking reading in direct sunlight, instrument was left in place too long, or removed before it stabilized, calibration