Thickness of rust on steel

[birkATO]

Hi:

I know I probably will not provide enough informaiton to get what I need, but here goes...I need to estimate how much rust is sandblasted off of a large piece of steel which I beleive to be some type of mild carbon steel with a coating of surface rust. Are there any methods out there on how to estimate the thickness of a rust layer or calculate how many milimeters of rust will develop over a certain amount of time assuming storage in an indoor environment? Is there perhaps a rule of thumb that predicts how many milimeters of rust will develop over the course of say a month?

I am familiar with the oxidation process, but know nothing about the rate at which this process occurs or how to predict it. If I need to provide more information to get an estimate, what kind of information do I need?

 

[KENAT]

Things like the environmental conditions (humidity, temperature, presence of other chemicals...), if the part has any kind of corrosion prevention coating...

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(probably not aimed specifically at you)
What is Engineering anyway: faq1088-1484​

 

[TomDOT]

Th thickness of the rust can be measured easily with a magnetic dry film thickness (DFT) gauge, which is commonly used to determine paint film thickness after application.

In dry storage, rust formation should be darn slow. The primary "drivers" are salt concentration (mostly from chlorides) and moisture level.

 

[unclesyd]

You might want to checkout the information on this site as it dovetails the information posted above.