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SteveD CB500K0:
Anoraks only...

My wife teaches year 4 primary (9 year olds)

Next week they are doing “rust”

I’ve been asked (= told) to find a load of experimental kit:

Steel nail
Zinc plated nail
Stainless nail
Copper nail
Brass nail
Wrought iron nail

These are to be subjected to immersion in the following:

Rainwater
Carbonated water
Salty water
Vinegar
Lemon juice

I can probably dig up most of them as screws or bolts, but copper nails?

Would anyone like to predict what 30 year fours will find?


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Moorey:
Copper nails are quite common especially for roofers. Also used for killing trees. :)

K2-K6:
Warmed up the adenoids and dug my anorak out  ;D

Do you mean corrosion? Or rust as in ferrous orange flaky stuff?

Thought you'd get rust more with steel and wrought iron in salty water most easily.

The others may discolour to some extent.

Two (copper and steel)  for example in lemon juice may plate one onto the other.

Copper goes green in rainwater on roofs,  but may take a while to show in experiment.

Woodside:

Wire/cable
Penny....?

As long as it's copper

Does it have to be a nail

hairygit:

--- Quote from: Woodside on March 15, 2019, 08:38:15 PM ---
Wire/cable
Penny....?

As long as it's copper

Does it have to be a nail

--- End quote ---
Post I think 1991 1p and 2p coins aren't pure copper, they contain steel as well, check with a magnet. That was because at that time the world price of copper soared, and the 7grams of  copper was worth more than the 2p face value, and unscrupulous villains were smelting coins of the realm for scrap copper value!

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