Cathodic reduction of Cu-, Pb-, Ag-, oxides and sulphides. Identification and quantitative determination

Applying the coulometric data, obtained in the process of cathodic reduction of corrosion products (oxides, sulphides etc. - in a compact or in a loose form), it is possible to determine, with good accuracy, the mass of corroded metal. These data enable also to recognize and to determine the share of the compounds present in corrosion products. It would not be attained using the weighing methods (mass increase in result of corrosion, or mass loss in effect of the assumed removal of corrosion products). It has been also proved that in several cases the weighing methods can't supply reliable data. - The terms of coulometric experiments and the limitations of that method have been discussed. - Advantages of the cathodic reduction in conservation of the corroded metal objects (Pb, Cu, Ag and their alloys) have been pointed out.