NACE CIP Level 1 Study Guide Questions Exam Solved 100% Correct!!

Corrosion - The deterioration of a material, usually a metal, that results from a reaction with its enviroment Passivation - a reduction of the anodic reaction rate of an electrode involved in corrosion What are the elements of a corrosion cell? - Anode, cathode, return path, electrolyte Describe what happens at the anode - 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 - A chemical substance containing ions that migrate in an electric field What is the function of the metallic pathway - (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 - A list of metals and alloys arranged according to their corrosion potentials in a given environment The general rules of galvanic corrosion are: - (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 - Oxygen (lowers, lowers), temperature (lowers, lowers), chemical salts (less, less) humidity (wetter, more corrosion), pollutatnts/acid gases (lower, lower)General corrosion is - distributed more or less uniformly over the surface of a material