✍ Scribed by M. Praz̆ák; T.X. Sen; D. Kuchyn̆ka
No coin nor oath required. For personal study only.
A method consisting in galvanostatic anodic stripping of layers with thicknesses of the order of nanometers combined with gamma-spectromctric analysis of soluble anodic reaction products has been developed for the purpose of a study of concentration profile of alloy components in the surface of alloys after a corrosion process.
Suitable conditions as regards the stripping solution and the electrochemical parameters were investigated to ensure reliable determination of the quantity of stripped metal based on the Faraday relationship and to provide for a uniform removal of metal from the surface. Experimentally verified constants for the conversion of passed electric charge to stripped layer thickness are given for steel grades FeCrl7. FeCrlSNiSMn9, FeCrl8Ni9, FrCrlSNilOMoZ and FcCrZONi38Mo6, the average accuracy being f 1.5 per cent.
Two examples are presented to illustrate the determination of the concentration profile of components in the surface of steel grade FeCrlSNi9.
Recent studies have revealed that the corrosion of alloys can result in changes of chemical composition of the metallic phase or of the passive layer due to selective (extractive) corrosion of one of the constituents. This effect strongly influences the corrosion
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