1153 Galvanic Bimetallic Corrosion

This type of corrosion occurs when dissimilar metals are in electrical contact with an aqueous aggressive electrolyte (see Fig. 11.7). A guide to the tendency (driving force) for galvanic corrosion can be assessed from the galvanic series (see Table 11.3). The magnitude of galvanic corrosion is affected by:

Metal dissolution

Cathodic reduction

Metal dissolution

Cathodic reduction

Electron transfer

FIGURE 11.7 Schematic showing a galvanic corrosion cell.

Electron transfer

FIGURE 11.7 Schematic showing a galvanic corrosion cell.

TABLE 11.3 Galvanic Series for Metals/Alloys in Aerated Flowing Seawater (25° C, 0.25 m/s)

Electrode Potential in Metal/Alloy System Volts (vs (SCE)

TABLE 11.3 Galvanic Series for Metals/Alloys in Aerated Flowing Seawater (25° C, 0.25 m/s)

Electrode Potential in Metal/Alloy System Volts (vs (SCE)

Pt

0 0

Post a comment