Qualitaively investigate the effectiveness of 3 methods of preventing an object containing iron from corrosion?

What a messed-up way of asking a simple question - how do you keep metal from going rusty...





Here's 3 methods:





1. Keep it oiled


2. Paint it


3. Anodise it





You go on and ';qualitaively investigate'; them, whatever that means.Qualitaively investigate the effectiveness of 3 methods of preventing an object containing iron from corrosion?
Well there are various methods.However, I would choose a) Painting/coating, b) Galvanising, c) Electroplating. All three provided excellent protection from corrosion by preventing oxidation of the surface of the object. Painting has a limited life and can easily be damaged so needs re-coating after time. Galvanising acts as a sacrificial cathodic coating and therefore provides excellent long-term protection but is a soft coating of zinc so can be damaged easily by abrasion. Electroplating may be decorative or a functional coating (e.g. Chrome or Nickle) and some finishes will degrade in time without regular maintenance or additional coating but it can provide a very hard wear resistant surface for moving parts.Qualitaively investigate the effectiveness of 3 methods of preventing an object containing iron from corrosion?
1. Put it in oil?


2. Wrap it in fish?


3. Cook it?





Maybe not 2 or 3 but I'm sure 1 is ok.