MATSE Exam 3 UPDATED QUESTIONS
AND CORRECT ANSWERS
Of the components in an electrochemical cell, identify where corrosion occurs. - CORRECT
ANSWER Anode
What is the chemical reaction which occurs at the cathode during aqueous corrosion
processes? - CORRECT ANSWER Hydrogen Ion Creation
When using the galvanic series to evaluate dissimilar metal combinations, is corrosion
enhanced or mitigated when two metals far apart in the series are put in contact? - CORRECT
ANSWER enhanced
What is the mechanism by which selected metals and alloys (Cr, Ni, and Ti) lose their
chemical reactivity and become extremely inert under certain environmental conditions? -
CORRECT ANSWER Passivation
What type of corrosion is characterized by local attack in a crevice between metal-to-metal
surfaces? - CORRECT ANSWER Crevice Corrosion
Using Gibbs phase rule, how many degrees of freedom are there in a two phase region of a
binary phase diagram? - CORRECT ANSWER 2
What is the best description of the appearance of a eutectic microstructure? - CORRECT
ANSWER lamellar
What is the name for the invariant transformation that involves two solids transforming to a
different solid phase on cooling? - CORRECT ANSWER eutectoid
What is the nucleation mechanisms in which nuclei of the solid phase form in the interior of
the liquid as atoms cluster together to form a packing arrangement similar to that found in the
solid phase? - CORRECT ANSWER Homogeneous Nucleation
AND CORRECT ANSWERS
Of the components in an electrochemical cell, identify where corrosion occurs. - CORRECT
ANSWER Anode
What is the chemical reaction which occurs at the cathode during aqueous corrosion
processes? - CORRECT ANSWER Hydrogen Ion Creation
When using the galvanic series to evaluate dissimilar metal combinations, is corrosion
enhanced or mitigated when two metals far apart in the series are put in contact? - CORRECT
ANSWER enhanced
What is the mechanism by which selected metals and alloys (Cr, Ni, and Ti) lose their
chemical reactivity and become extremely inert under certain environmental conditions? -
CORRECT ANSWER Passivation
What type of corrosion is characterized by local attack in a crevice between metal-to-metal
surfaces? - CORRECT ANSWER Crevice Corrosion
Using Gibbs phase rule, how many degrees of freedom are there in a two phase region of a
binary phase diagram? - CORRECT ANSWER 2
What is the best description of the appearance of a eutectic microstructure? - CORRECT
ANSWER lamellar
What is the name for the invariant transformation that involves two solids transforming to a
different solid phase on cooling? - CORRECT ANSWER eutectoid
What is the nucleation mechanisms in which nuclei of the solid phase form in the interior of
the liquid as atoms cluster together to form a packing arrangement similar to that found in the
solid phase? - CORRECT ANSWER Homogeneous Nucleation
