Polymer Effect on Electrochemical Polarization Kinetics of Metals

3 Polymer Effect on Electrochemical Polarization Kinetics of Metals 

It is recognized that once the barrier action of structural polymers is broken, they cannot impose any effect on metal corrosion in electrolyte solutions, although the linear-selective dissolving of the metal is attributed to specific properties of dielectrics in individual cases. Investigations of the 

The authors have studied the effect of polymer powders and films on corrosion rate of steels and their physical-chemical properties in aqua solutions of electrolytes. The experimental method was as follows. 

One of two platinum electrodes was immersed into an NaCl solution (10 mol/1) to a fixed depth. The immersion depth of the second electrode was a variable factor. Kinetics of the second electrode potential variation towards that of the silver chloride was registered and compared to the case when a PVB powder was placed on the solution surface (dispersion degree 160-200pm, powder layer density 4mg/cm ). 

Application of polymer powders on the solution surface leads to the generation of an electrode potential gradient in solution depth (Fig. 1.9). The strongest reduction of the potential in time was recorded at a minimal (15 mm) distance of the electrode from the powder layer on the surface. With increasing immersion depth, the potential variation becomes less prominent and is not registered at 60 mm depth. 

---