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51316-7461-A Consistent Interpretation of Corrosion Test Results Using the Marcus Film Growth Model

Product Number: 51316-7461-SG
ISBN: 7461 2016 CP
Author: James Orr
Publication Date: 2016
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The corrosion behavior of several steels and nickel-based alloys in high temperature water was analyzed using a mechanistic model described by Marcus and co-workers. The model was used because it allows for different behavior at short and long times. The analysis provided good fits to the data and provided an explanation for results previously considered anomalous. It was discovered that the amount of total corrosion of a material deviated from normal parabolic behavior depending on the value of a critical model parameter xd the "characteristic film thickness" which is determined by fitting the data. Materials with intermediate values of xd have apparent corrosion rates that are sensitive to the amount of pick-up of species from other sources e.g. corrosion of other materials within the same system.

The corrosion behavior of several steels and nickel-based alloys in high temperature water was analyzed using a mechanistic model described by Marcus and co-workers. The model was used because it allows for different behavior at short and long times. The analysis provided good fits to the data and provided an explanation for results previously considered anomalous. It was discovered that the amount of total corrosion of a material deviated from normal parabolic behavior depending on the value of a critical model parameter xd the "characteristic film thickness" which is determined by fitting the data. Materials with intermediate values of xd have apparent corrosion rates that are sensitive to the amount of pick-up of species from other sources e.g. corrosion of other materials within the same system.

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