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Abstract

This chapter discusses the complex polarization characteristics of active-passive metals and addresses related problems in interpreting their corrosion behavior. It begins by presenting several experimentally derived polarization curves for iron, comparing and contrasting them with the iron-water Pourbaix diagram. It then explains how anodic polarization is extremely sensitive to the environment and, as a result, a reasonably complete curve for a given metal-environment system usually can only be inferred. It goes on to describe how such curves are constructed, demonstrating the procedures for a wide range of alloys and environments. The examples also show how factors such as alloy concentration, crystal lattice orientation, temperature, and dissolved oxygen affect corrosion behavior.

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Corrosion of Active-Passive Type Metals and Alloys, Fundamentals of Electrochemical Corrosion, By E.E. Stansbury, R.A. Buchanan, ASM International, 2000, p 183–231, https://doi.org/10.31399/asm.tb.fec.t65940183

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