STP727: A Method of Evaluating Polarization Curves for Stainless Steel via a Simple Passivation Model

    Bernhardsson, S-O
    Manager, Product Development of Stainless Steels, and head, Wet-Corrosion Laboratory, Sandvik AB, Sandviken,

    Mellström, R
    Manager, Product Development of Stainless Steels, and head, Wet-Corrosion Laboratory, Sandvik AB, Sandviken,

    Pages: 13    Published: Jan 1981


    Abstract

    If it is assumed that the passivation process of stainless steels in acid solutions follows Langmuir's adsorption isotherm, a relatively simple function is obtained that describes the form of an anodic polarization curve. This function has been adapted to experimental results obtained with stainless steels in sulfuric acid in order to study the effect of alloying elements on the rate of different partial reactions. Adjustment to experimental data can be effected by nonlinear regression analysis or by a simpler manual method. The results show that, among other things, chromium in concentrations ≥12 percent accelerates anodic dissolution and passivation, while nickel and molybdenum have the contrary effect.

    Keywords:

    stainless steels, electrochemical kinetics, passivation, corrosion


    Paper ID: STP28044S

    Committee/Subcommittee: G01.11

    DOI: 10.1520/STP28044S


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