chapter 1.2.3.4 review second half

Question 1

chief advantage of lacquers developed during ww1 over varnish oils

Answer 1

left clear film that could be easily pigmented. page4

Question 2

why is oxygen important to corrosion reaction. what does it cause

Answer 2

with out oxygen the process slows or stops. it is a depolarizer

Question 3

in any electrochemical reaction which half cell is more negative

Answer 3

the cathode

Question 4

which side does reduction take place positive or negative

Answer 4

at the cathode

Question 5

which side does oxidation take place positive or negative

Answer 5

at the anode

Question 6

how to control mil scale

Answer 6

by pickling or blasting

Question 7

______ ______ is from mild surface contamination caused by solid particles depositited from the atmosphere or particles that remain after metal has been processed.

Answer 7

cause of filiform corrosion

Question 8

should salts be removed from metal before coating

Answer 8

yes

Question 9

3 types of coating exposure from ppnt slides

Answer 9

atmospheric
immersion
underground

Question 10

earliest known painting made from

Answer 10

naturally occurring oxides

Question 11

when you need strong adhesion, cohesion, inertness, intercoat bonding, distension

Answer 11

when to use a primer

Question 12

this provides : resistant seal, intitial barrier to environment, resistnce to chemical, water, and weather, tough surface, pleasing appearance

Answer 12

top coat

Question 13

first protective coating developed by Egyptians for ships

Answer 13

various pitches and balsam

Question 14

what coating system did railroad develop for steel riveted bridges.

Answer 14

red lead-linseed oil primer followed by linseed oil-graphite topcoat

Question 15

where the metal loss takes place

Answer 15

anode

Question 16

anode, cathode, electrolyte, external contact

Answer 16

four parts of electrochemical corrosion cell

Question 17

which metal has the greatest tendency to to go into solution

Answer 17

the most negative

Question 18

what is needed to slow or stop corrosion in a corrosion cell.

Answer 18

a big anode

Question 19

four parts of coating

Answer 19

binder, vehicle, solvent, pigment

Question 20

will dissolve the binder, transport the combination to the substrate, and aid in wetting the substrate

Answer 20

solvent

Question 21

converts a coating into a dense, solid, adherent membrane. it provides a uniformity and coherence.

Answer 21

binder

Question 22

react with substrate to provide passivated surface, produce color, reinforcement

Answer 22

pigment

Question 23

binders also known as

Answer 23

vehicles

Question 24

refers to the amount of water that is picked up and retained within the molecular spaces of the coating

Answer 24

water absorption

Question 25

the rate at which moisture vapor will transfer through a protective coating when there is a difference in moisture vapor pressure.

Answer 25

moisture vapor transfer rate

Question 26

the passage of water through a semipermeable membrane from solution of less concentration to one of greater concentration

Answer 26

osmosis

Question 27

the forcing of water through a semipermeable membrane by an electrical potential

Answer 27

electroenosmosis

Question 28

resists the passsage of any electrons and thus preventing any metal from going into solution at the anode

Answer 28

dielectric strength

Question 29

transfer of ions from the exterior of a coating to the substrate

Answer 29

ionic passage

Question 30

ability of the coating, and the resins from which it is formulated, to resist breakdown by action to chemicals to which it is exposed.

Answer 30

chemical resistance

Question 31

the corrosion at a break in the coating, growing back underneath the surface of the coating away from the break.

Answer 31

undercutting

Question 32

solvent evaporation, oxidation, polymerization, inorganic, change of phase, coalescent

Answer 32

film forming mechanisms

Question 33

Film forming mechanisms

Answer 33

Solvent evaporation. Oxidation. Polymerization

Inorganic. Change of phase. Coalescent