Applied Metallography by George F. Vander Voort (auth.), George F. Vander Voort

By George F. Vander Voort (auth.), George F. Vander Voort (eds.)

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Although these differences in dissolution rate have not been correlated with differential attack on polycrystalline nickel, the curves can be used as a guide for potentiostatic etching for grain contrast. Applying Eq. 0,-- - - - - -- -- - - -- - - - - - - - - , W 15 o . ,::.. ' ~ lO o ? c. 5 I- z w l- i? 0 CURRENT DENS ITY (mA/cm2) Fig. 2-8. Polarization curves for single nickel crystals with indicated planes in contact with IN H 2S0 4 (13). 24 angstroms and etching to produce divalent ions, removal of one atom layer from a square centimeter of surface requires 6 X 10- 4 C cm- 2.

2-3, a reference electrode such as the calomel half-cell is placed in the solution, then the potential of the corroding metal relative to this electrode can be measured using an electrometer. If the size of the local anodic and cathodic sites is large relative to the size of the reference electrode, then movement of the reference electrode permits detection of these sites. Limiting examples are the use of very small reference electrodes to measure variations in potential over grains, phases, and interfaces.

10% Oxalic acid MeOH-3HN03-2HCIO. ,

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