By Marcel Pourbaix
ISBN-10: 1468418068
ISBN-13: 9781468418064
ISBN-10: 1468418084
ISBN-13: 9781468418088
Workers within the box of corrosion and their scholars are so much lucky satisfied set of situations introduced Dr. Marcel Pourbaix into their box in 1949. First, he was once invited, whereas within the united states, to illustrate at a week stopover at to the nationwide Bureau of criteria the usefulness of his electro chemical thoughts to the examine of corrosion. Secondly, additionally round the related time, Prof. H. H. Uhlig made a speech sooner than the United international locations which mentioned the large fiscal outcomes of corrosion. due to those conditions, Dr. Pourbaix has reminisced, he selected to dedicate so much of his efforts to corrosion instead of to electrolysis, batteries, geology, or any of the opposite fields the place, one may possibly upload, they have been both helpful. This determination ended in his setting up CEBELCOR (Centre BeIge d'Etude de los angeles Corrosion) and in his improvement of a direction on the loose collage of Brussels entitled "Lectures on Electrochemical Corrosion." This publication is the gathering of those lectures translated into English.
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Additional resources for Lectures on Electrochemical Corrosion
Example text
65 (1967). U CHAPTER 1: Introduction to Corrosion 18 TABLE In. State of Environments and Metals for Experiments in Figure 1 (see also Figure 8, where values of potential and pH in this table are plotted graphically) Expt. Sample No. SO. NaHSO. CrO. CrO. + NaCI KMnO. KMnO. O. O. 200 State of metal • • •• Gas H. 0 0 t) • • • • • 0 0 O. H. 690 • • 0 H. H. 495 0 H. H. 860 0 H. 0 0 H. O. 550 • • • 0 0 0 O. H. O. 5. 0 0 9 > :r w "0 ~ Q> CORROSION 0 /0 "0 Q. 6 ........ 'I'" 2 12 14 .. 0 016 820 0 24 CORROSION 0 2 4 6 8 10 12 14 pH Figure 8.
Obviously the more stable compound is the least soluble in a given solution and the difference between the logarithms of the relative solubility constants of the two forms is equal to the difference between their chemical potentials divided by 1363 (at 25°C). For example, for CaCO s the solubility product of calcite at 25°C is less than that of aragonite, and the difference between the logarithms of these constants is 269,780 - 269,530 = 250 = 0 18 1363 1363' To show this result more clearly, consider the case of the dissolution equilibrium of CaCOs = Ca++ + COa- for which the solubility product is log [Ca++] .
860 0 H. 0 0 H. O. 550 • • • 0 0 0 O. H. O. 5. 0 0 9 > :r w "0 ~ Q> CORROSION 0 /0 "0 Q. 6 ........ 'I'" 2 12 14 .. 0 016 820 0 24 CORROSION 0 2 4 6 8 10 12 14 pH Figure 8. Theoretical and experimental conditions of corrosion, 0, of iron at 25°C. e, and noncorrosion, which causes the form of corrosion known in boiler technology as "caustic cracking" when stresses are present. We have just used the potential-pH equilibrium diagram relating to the system Fe-H2 0 for studying the behavior of iron in the experiments outlined in Figure 1.
Lectures on Electrochemical Corrosion by Marcel Pourbaix
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