SYMPOSIA PAPER Published: 01 January 1981
STP28044S

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

Source

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.

Author Information

Bernhardsson, S-O
Sandvik AB, Sandviken, Sweden
Mellström, R
Sandvik AB, Sandviken, Sweden
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Details
Developed by Committee: G01
Pages: 352–364
DOI: 10.1520/STP28044S
ISBN-EB: 978-0-8031-4795-9
ISBN-13: 978-0-8031-0704-5