Fig. 5.41 Approximate anodic polarization curve for iron and cathodic polarization curves for oxygen under several conditions and for nitrite ions. The polarization curves are used to estimate the effects of these environments on corrosion rate. Estimated Ecorr and icorr for the several More

Fig. 3.16 Cathodic polarization of the hydrogen reduction reaction on iron showing the effect of pH. Curve for platinum shows influence of a metal with much higher exchange current density on the position of the hydrogen reduction curve. Source: Ref 5 More

Fig. 3.19 Cathodic polarization curves for 100 and 10,000 ppm Fe 3+ (as FeCl 3 ) on platinum in nitrogen-deaerated solution. The increase in current density at 400 mV (SHE) is due to a velocity effect in introducing nitrogen sparging into the solution. The limiting current density is increased More

Fig. 3.21 Anodic and cathodic polarization curves for nitrite ion on platinum. Assumed reduction reaction is a NO 2 − + 8 H + + 6 e → NH 4 + + 2 H 2 O . Equilibrium half-cell potential corresponds to a NO 2 − = 0.1 More

Fig. 5.10 Schematic representation of the net anodic and cathodic polarization curves, N, for the anodic metal, M, and for the cathodic hydrogen, H, polarization curves. Note that the net curves deviate from curves M and H only near E corr . SC is the sum of cathodic polarization for H + and H 2 More

Fig. 5.15 Net or experimentally measured anodic and cathodic polarization curves from Fig. 5.14 More

Fig. 5.18 Net anodic and cathodic polarization curves of Fig. 5.17 More

Fig. 15 Anodic and cathodic polarization curves showing the effect of an anodic inhibitor More

Fig. 19 Anodic and cathodic polarization curves for an active metal in deaerated acid. Source: ASTM Standard G 3 More

Fig. 6 Effect of cathode polarization More

Fig. 4.8 Tafel polarization curves for anodic and cathodic reactions as related to the nth current channel in Fig. 4.7 , illustrating the dependence of the corrosion current, I corr , on the solution resistance, R S More

Fig. 4.13 Relationship of the mixed-electrode cathodic and anodic polarization curves (solid lines) to the oxidation and reduction components (dashed lines) of the individual anodic and cathodic reactions More

Fig. 4.15 Mixed-electrode cathodic and anodic polarization curves (solid lines) based on the reduction component of the cathodic reaction and the oxidation component of the anodic reaction (compare with Fig. 4.13 ) More

Fig. 4.26 Schematic polarization curves used in the analysis of cathodic protection by an impressed external current. Cathodic reaction is under Tafel control. More

Fig. 4.27 Schematic polarization curves used in the analysis of cathodic protection by an impressed external current. Cathodic reaction is under diffusion control. More

Fig. 5.12 Sum (SC) of cathodic oxygen, hydrogen, and water polarization curves of Fig. 5.11 . Oxygen curve dominates above –300 mV (SHE) and hydrogen curve below –300 mV (SHE). Water reduction makes negligible contribution to the current density. pH = 1. P O 2 = 0.2 atm More

Fig. 5.13 Relative positions of anodic metal polarization curve, M, and sum cathodic curve, SC, for cathodic oxygen and hydrogen-ion polarization. pH = 1. P O 2 = 0.2 atm More

Fig. 18 Activation polarization curve for the cathodic reaction of hydrogen ions and hydrogen gas More

Fig. 5.14 Net polarization curves, N, associated with the individual anodic and cathodic polarization curves. pH = 1. P O 2 = 0.2 atm. Curve M, anodic polarization curve for metal; curve H, cathodic polarization curve for H + ; curve W, cathodic polarization curve for H 2 O; curve O, cathodic More

Fig. 7.34 Idealized polarization curve for iron in neutral solution. Idealized cathodic polarization curves for sodium nitrite and oxygen under aerated and deaerated conditions. E corr ,i corr indicated for each environment More