WorksheetsCorrosion Lab Post Test
Total questions: 10
Worksheet time: 3mins
Corrosion occurs on
variable temperature
increasing temperature
constant temperature
decreasing temperature
The use of SHE in real conditions, is not possible, because
it only work on high temperatures
might freeze during operation
not easy to be conducted
yields invalid result
The following statements are the application of a potential series or volta series, except:
Electrode selection on the battery design
selection of sacrificial anode
Anodic reaction selection
selection of Dummy anode
Here are some chemical reactions involving compounds and elements.
(1) HCl + Fe
(2) FeOH2 + Cu
(3) HNO3 + Fe
(4) Al2O3 + Fe
(5) FeCO3 + H2O
Reactions which are not possible in STP conditions are
(1) (2) (3)
(2) (4) (5)
(1) (4) (5)
(1) (2) (4)
Examples of compounds that might be able to corrode Iron are
H2SO4, HNO3, FeCO3, H3PO4
H2SO4, HNO3, H3PO4, HCl
HNO3, HCl, H2CO3, FeS
HCl, HNO3, H2S, FeSO4
Inhibitors which work by reacting with solution is called
Commercial inhibitors
Anodic inhibitors
Cathodic inhibitors
Mixed inhibitors
Inhibitor efficiency shows
Solubility of inhibitors
Effectiveness in protecting metal from corrosion
Effectiveness in protecting solution from corrosion
Values of corrosion rate after inhibitors injected
Here are some causes of increasing corrosion rates after the inhibitors are injected in corrosive media:
(1) evaporation of inhibitors
(2) Inhibitors vanish because they join the flow of corrosive media
(3) Inhibitors vanish because of reaction with corrosive media
(4) Inhibitors vanish because of reaction with metal
(5) Solidification of inhibitors
The correct statement is shown by the number
(4) (5)
(1) (5)
(2) (3)
(1) (2)
Below are the step on Cathodic Protection (CP) design is, except
Wenner Four Pin Testing for soil environment
Selection of sacrificial anode types
Potential surveys in the water environment after installing CP System
The calculation of the area which the structure buried
The anode installed on ICCP and SACP are selected from metal with opposite characteristics, this is because:
The SACP anode must be small, while the anode ICCP must be large
The SACP anode must be consumed by corrosive media, while the anode ICCP only closes the circuit
The SACP anode must be more positive than the structure, while the ICCP anode only closes the circuit
The anode SACP and anode ICCP only close the circuit
