Which metal is most resistant to corrosion?

[deleted-381749]

I need a rating system that describes the corrosion of iron, aluminum, copper, and galvanized iron in water and salt water. I'm not sure how to make a rating scale that is easy to understand. Please help

[norman40]

Hi pk17,

I’m assuming that you are working on the project described here:

https://www.sciencebuddies.org/science- ... p018.shtml

The procedure (step 10) requires that you develop a rating scale to distinguish the changes you observed in the metals placed in air, water and salt water. You’ll use the ratings to compare the amounts of corrosion.

One way to make a rating scale is to assign a number to your least corroded sample (number 1) and another number to your most corroded sample (number 5). Samples with “in-between” amounts of corrosion would be assigned the numbers 2, 3 and 4. Then write descriptions of the appearance of the five amounts of corrosion. For example, you might note the color of the metal, smoothness of the surface, flakiness of the surface and shine on the surface. And you might want to make photos of each of the samples to go with the descriptions.

I hope this helps. Please ask again if you have more questions.

A. Norman