Argentum Solutions, Inc.
Sterling guidance on corrosion and materials degradation
| Potential-pH Diagrams |
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| Intelligent Tools |
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| Corrosion Calculator |
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| Corrosion Economics Estimator |
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David C. Silverman |
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Some corrosion tests require use of a wire to enable a more rapid evaluation. One example is ASTM G-116 "Conducting Wire-on-Bolt Test for Atmospheric Galvanic Corrosion". This test consists of a 1 meter wire of less than 1mm diameter (the anode) wrapped around a bolt or rod (the cathode). The evaluation is by mass change only. Assuming that the loss is uniform, the change in radius can be relevant. Usually, corrosion rate is not calculated. In this case, the wire diameter being much smaller than the galvanic interaction distance enables a relatively fast ~90 day test. A wire not connected to the bolt is also exposed in this test to enable assessment of the galvanic interaction between the bolt and wire. The calculator uses the following equation to estimate the change in radius of the wire  (2)where: Δr = radius reduction from corrosion (in or mm) mi = mass before exposure (gram) mf = mass after exposure (gram) di = initial diameter (in or mm) Δm = change in mass (gram) The units are those most commonly used and are those assumed for this calculator. The only information required of the user is the initial wire diameter (inches or millimeters), the initial mass (grams), and the final mass (grams). The corrosion rate is not calculated because of expected reg | |||
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David C. Silverman, Ph.D. - Primary Consultant |
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