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NACE CIP LEVEL 1 STUDY GUIDE QUESTIONS WITH CORRECT ANSWERS

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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 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 corrodes 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), pollutants/acid gases (lower, lower) General corrosion is Correct Answer distributed more or less uniformly over the surface of a material Localized corrosion is Correct Answer Occurs at discrete sites on the metal surface List some of the common tools/methods used for corrosion control Correct Answer Design - eliminate water, edges, maintenance, inhibitors, material selection, cathodic protection systems, protective coatings, alteration of environment [Show More]

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