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Models are situations created to be understand a phenomenon. Corrosion is a broad subject, so any number of models could be set up to understand it. Here’s one. The iron in an outboard motor is rusting. The person trying to fix that might use a piece of zinc as a sacrificial anode. But how big should the piece of zinc be to protect the iron in the motor for 1 year? That is where the model comes in.

Corrosion is an oxidation-reduction reaction (Redox). We measure those reaction based on the voltage of each half reaction. We might also measure concentrations of ions in solution. We might measure the weights of anodes.

2007-01-12 04:43:27 · answer #1 · answered by James H 5 · 0 0

Standard corrrosion test methods are specified by ASTM in various test methods. They are widely used in the metal industry to indicate corrosion rates in mpy or mills per year ( mill means thousandth of an inch ). Companies manufacturing special alloy materails that are highly resistant to corrosion - 316 SS, Hastelloys, Inconel alloys, Tanatulm etc, will specify corrosion rates in mpy or equivalent units.

Specific size metal coupons are exposed in the presence of an atmosphere of known chemical composition and results are measured in accordance with the standard test method.

Check with your local engineering library or find a member of the folowing organization in an industrial sector:

www.astm.org

Check the following webpages for further information:

http://www.imrtest.com/what_we_do/corrosion/index.html
http://webstore.ansi.org/ansidocstore/dept.asp?dept_id=1525

2007-01-12 06:47:29 · answer #2 · answered by Anonymous · 0 0

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