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Title: Modeling the effect of insoluble corrosion products on pitting corrosion kinetics of metals
Authors: Ansari, TQ 
Luo, JL
Shi, SQ 
Issue Date: 2019
Source: npj materials degradation, 2019, v. 3, 28, p. 1-12
Abstract: Most metals naturally corrode in an engineering environment and form corrosion products. The corrosion products can be either soluble or insoluble in the aqueous solution. The insoluble corrosion products (ICP) could have profound effects on the corrosion kinetics of the concerned metal. In this study, a multi-phase-field formulation is proposed to investigate the effects of ICP formation on pitting corrosion kinetics. The Gibbs free energy of the metal-electrolyte-insoluble corrosion product system consists of chemical, gradient, and electromigration free energy. The model is validated with experimental results and several representative cases are presented, including the effect of the porosity of ICP, under-deposit corrosion, corrosion of sensitized alloys, and microstructure-dependent pitting corrosion. It is observed that corrosion rate and pit morphology significantly depend on ICP and its porosity for the same applied potential.
Publisher: Nature Publishing Group
Journal: npj materials degradation 
EISSN: 2397-2106
DOI: 10.1038/s41529-019-0090-5
Rights: © The Author(s) 2019
Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons. org/licenses/by/4.0/.
The following publication Ansari, T. Q., Luo, J. L., & Shi, S. Q. (2019). Modeling the effect of insoluble corrosion products on pitting corrosion kinetics of metals. NPJ Materials Degradation, 3(1), 1-12 is available at https://doi.org/10.1038/s41529-019-0090-5
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