How can we measure/quantify the corrosiveness of a material (inorganic salt)? Is there any easy compare with a reference material like water?
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with high-performance new way of testing Corrosion can be found in the article: "A study of the corrosion kinetics by coulometric detection of corrosion products on a glass carbon electrode" in Chemical and Materials Engineering 2 (1): 1-8, 2014 .
Dr.A.Kuzmak.
Abstract: The paper reports the theoretical and experimental bases of the CDCP (Coulometric detection of corrosion products) method and examples of its application for the quantitative determination of the ionic forms of corrosion products of carbon steel, including the heat-affected corrosion areas of welding seams under strain ageing (ACWS). The experiment technique that we developed allowed us to perform selective determination of corrosion products (e.g., Fe+2 and Fe+3 in a single experiment) in the range of 1–5 μg with standard deviation sr = 0.05.
Keywords: Coulometric Detection, Corrosion Product, Ionic Form, CDCP, corrosion kinetic
There are vast swathes of literature on corrosion and lots of good experimental techniques have been developed to monitor the progress of a corrosion reaction with time. In very simple terms you can determine the corrosion current from tafel plots from voltammetric sweeps of the material in different media.
A good description is found here:
http://www.gamry.com/application-notes/basics-of-electrochemical-corrosion-measurements/
Good luck!
I did a little bit work on the corrosion of welds in liquid metal, but not sure if that would help you. They looks different, if further information need, please let me know. Good luck.
Thanks a lot to all for the inputs
Is any comparive scale or standard chart is there which will be very useful in selecting a less corossive salt / material for the application? For eg in liquids say corossive scale of water is 1 and for some acid it is 5.5 (which gives a guess which material is less corossive), similarly for solids.NaOH is more corossive than NaNO3. If scale is not there, atleast list of materials in the increasing order of corossive action
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