HS2440 Week 8 Asyn_Zinc Corrosion (copy)

Question 1

properties and uses of zinc,

its electrode potential is…

Answer 1

• sacrificial metal; will be used to plate other metals as it will corrode preferentially
• such as galvanised steel
• alloys with copper to make brasses (reduced corrosion thresholds)
• malleable, rollable and ductile
• good thermal conductor

Question 2

typical atmospheric corrosion of zinc. different products which form in different environments

Answer 2

• ZnO, white rust is often the first phase in corrosion layers (low polluted)

Question 3

diagram of galvanised corrosion

Answer 3

Question 4

corrosion of painted zinc sheets, such as those found in st david’s church in hereford

Answer 4

-nails mounting are sites for galvanic corrosion

Question 5

in contact with carbonyl compunds, Z__ and zinc c________ are formed. what are some examples of product forming acids

Answer 5

Question 6

Zinc is not often found as an archaeological material as it was only found on its own from the…
how does zinc form scaling in water

Answer 6

• mid 18th century
• in contact with salts, calcium carbonate