NACE CP1 - QUESTIONS AND
ANSWERS
corrosion7-7ans--
The7deterioration7of7a7substance,7usually7a7metal7from7a7reaction7with7its7environment
Passivation7-7ans--
A7layer7of7oxides7formed7on7the7surface7of7a7metal7that7provides7corrosion7protection.
the7elements7of7a7corrosion7cell7-7ans--Anode,7cathode,7metallic7pathway,7electrolyte
what7happens7at7the7anode7-7ans--The7metal7dissolves7into7the7electrolyte
the7function7of7the7metallic7pathway7-7ans--
Allows7the7flow7of7electrons7to7connect7the7corrosion7cell
galvanic7series7-7ans--
A7listing7in7order7of7reactivity7(7more7or7less7noble)7in7seawater725c
The7general7rules7of7galvanic7corrosion7-7ans--
The7less7noble7(more7reactive)7metal7when7connected7to7a7more7noble7(or7less7reactiv
e7metal)7will7corrode7preferentially.
the7five7most7important7factors7that7affect7the7rate7of7corrosion.7-7ans--
Humidity,7oxygen,7chemical7salts,7pollutants,7temperature
General7corrosion7-7ans--
Results7in7a7relatively7uniform7loss7of7material7over7the7entire7surface.7Results7in7a7gen
eral7thinning7of7the7affected7surface.7Realively7easy7to7inspect.7Does7not7cause7catastr
ophic7failures.
Localized7corrosion7-7ans--
Typically7pitting7and7crevice7corrosion.7It7is7typically7of7the7most7concern7as7damage7is7
concentrated7and7loss7of7integrity7or7structure7failure7can7result.
Common7tool/7methods7used7for7corrosion7control.7-7ans--
Design,7inhibitors,7material7selection,7cathodic7protection,7protective7coatings,7splash7z
one7systems,7alteration7of7the7environment
Anode7-7ans--
The7electrode7of7an7electrochemical7cell7at7which7oxidation7occurs.7Electrons7flow7awa
y7from7the7anode7in7the7external7circuit.7Corrosion7usually7occurs7and7metal7ions7enter7
the7solution7at7the7anode.
ANSWERS
corrosion7-7ans--
The7deterioration7of7a7substance,7usually7a7metal7from7a7reaction7with7its7environment
Passivation7-7ans--
A7layer7of7oxides7formed7on7the7surface7of7a7metal7that7provides7corrosion7protection.
the7elements7of7a7corrosion7cell7-7ans--Anode,7cathode,7metallic7pathway,7electrolyte
what7happens7at7the7anode7-7ans--The7metal7dissolves7into7the7electrolyte
the7function7of7the7metallic7pathway7-7ans--
Allows7the7flow7of7electrons7to7connect7the7corrosion7cell
galvanic7series7-7ans--
A7listing7in7order7of7reactivity7(7more7or7less7noble)7in7seawater725c
The7general7rules7of7galvanic7corrosion7-7ans--
The7less7noble7(more7reactive)7metal7when7connected7to7a7more7noble7(or7less7reactiv
e7metal)7will7corrode7preferentially.
the7five7most7important7factors7that7affect7the7rate7of7corrosion.7-7ans--
Humidity,7oxygen,7chemical7salts,7pollutants,7temperature
General7corrosion7-7ans--
Results7in7a7relatively7uniform7loss7of7material7over7the7entire7surface.7Results7in7a7gen
eral7thinning7of7the7affected7surface.7Realively7easy7to7inspect.7Does7not7cause7catastr
ophic7failures.
Localized7corrosion7-7ans--
Typically7pitting7and7crevice7corrosion.7It7is7typically7of7the7most7concern7as7damage7is7
concentrated7and7loss7of7integrity7or7structure7failure7can7result.
Common7tool/7methods7used7for7corrosion7control.7-7ans--
Design,7inhibitors,7material7selection,7cathodic7protection,7protective7coatings,7splash7z
one7systems,7alteration7of7the7environment
Anode7-7ans--
The7electrode7of7an7electrochemical7cell7at7which7oxidation7occurs.7Electrons7flow7awa
y7from7the7anode7in7the7external7circuit.7Corrosion7usually7occurs7and7metal7ions7enter7
the7solution7at7the7anode.
