“Self arranged Cactis” as new goethite morphology from the natural corrosion process of SAE 1020 carbon steel

Thiago G Costa,Vanessa Wandersee Cunha Ostroski,Fernando S De Souza

doi:10.1016/j.heliyon.2019.e02771

Thiago G Costa, Vanessa Wandersee Cunha Ostroski + Show 1 more

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https://doi.org/10.1016/j.heliyon.2019.e02771

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Abstract

A new morphology of goethite aggregates (α-FeOOH) obtained through the natural corrosion process of 1020 carbon steel parts exposed to weathering was found. Micrographies obtained by SEM reveal micro and nanostructures with forms of nanosquares, microparticles, nanowires inside microparticles and the unpublished structure of "Self arranged Cactis", all varying between 115 nm and 8 μm. The molecular structure of goethite was characterized by FTIR and elemental analysis of EDX converged with the obtained data. The average corrosion rate for 1020 carbon steel in the weathering was 1.7592 mpy. The data obtained in this work will contribute to the understanding of the corrosion process of 1020 carbon steel, one of the most used in civil construction, as well as in material sciences, where iron oxides are widely used in metallurgy, catalysis and adsorption, and the domain of morphology is fundamental for each application.

Highlights

The understanding and characterization of metallic oxides resulting from the aging process of iron alloys has undeniable importance for several areas of knowledge, with emphasis on physics, chemistry and materials science, its multidimensional structures are fundamental to correlate with its applications and diagnosis of pathologies [1, 2, 3]
Natural corrosion products of iron-based materials are poorly studied at the micro- and nanostructural level, and these are of fundamental chemical importance for the understanding of the aging process of materials used in different technological areas from the art works until construction
Observing the tendency of mass loss of the SAE 1020 carbon steel sample exposed to weathering, it is possible to note that the corrosion product is soluble, but little adherent to the surface of the samples

Summary

Introduction

The understanding and characterization of metallic oxides resulting from the aging process of iron alloys has undeniable importance for several areas of knowledge, with emphasis on physics, chemistry and materials science, its multidimensional structures are fundamental to correlate with its applications and diagnosis of pathologies [1, 2, 3] In this way, the iron metal oxides have potential applications in the areas of catalysis [4], metallurgy [5], adsorption [6] and still important in the understanding of the degradation process of iron-based cultural art works [7]. Natural corrosion products of iron-based materials are poorly studied at the micro- and nanostructural level, and these are of fundamental chemical importance for the understanding of the aging process of materials used in different technological areas from the art works until construction

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