BASIC CHEMISTRY AND BASIC CORROSION THEORY

Question 1

negatively charged ion electrons greater than protons

Answer 1

anion anode

Question 2

positively charge ion protons greater than electrons

Answer 2

cation cathode

Question 3

how acid the solution is

Answer 3

excess of hydrogen (H+) ions

Question 4

how alkaline the solution is

Answer 4

excess of hydroxyl (OH-) ions

Question 5

pH neutral

Answer 5

7

Question 6

acid pH

Answer 6

less than 7

Question 7

alkaline pH

Answer 7

greater than 7

Question 8

between 4 and 8 corrosion is fairly _____ of pH

Answer 8

independent

Question 9

the pH of the environment around the cathode (the protected structure) becomes more _____ due to the production of hydroxyl ions or removal of hydrogen ions.

Answer 9

alkaline

Question 10

term applied to the loss of one or more electrons from an atom or molecule, which then forms a positively charge ion

Answer 10

oxidation

Question 11

the electrode or metallic site where oxidation occurs is called an

Answer 11

anode

Question 12

the term applied to the gain of one or more electrons to an atom or molecule

Answer 12

reduction

Question 13

the electrode or metallic site where reduction occurs is called a

Answer 13

cathode

Question 14

4 parts of ______ ____ are anode, cathode, electrolyte,metallic path

Answer 14

corrosion cell

Question 15

metal loss occurs at the

Answer 15

anode

Question 16

the anode and the cathode can be on different metals or on the ______ metal

Answer 16

same

Question 17

positively charged ions move away from the ______ and toward the _________

Answer 17

anode cathode

Question 18

when measuring voltage across an element of a circuit, the voltmeter is connected in _____ across the element.

Answer 18

parallel

Question 19

when a voltmeter is connected across a metallic element, such as a wire or pipeline with external current flow, the voltage display is positive when the ______ ______ of the voltmeter is upstream of the current flow.

Answer 19

positive terminal

Question 20

when measuring the voltage difference of dissimilar metals, the sign is positive when the positive terminal of the voltmeter is connected to the more ______ _____

Answer 20

noble metal

Question 21

structure-to-soil potentials are measured in reference to an __________

Answer 21

electrode (copper copper sulfate)

Question 22

there must be a voltage difference between the anode and cathode of a corrosion cell for ________ to flow

Answer 22

current

Question 23

the deviation from the open circuit potential of an electrode resulting from the passage of current

Answer 23

polarization