Corrosion Mechanism Suggested Based on Electrochemical Analysis and SVET for Uncoated Tinplate and Post Coated With a Hybrid Film

Kunst, Sandra Raquel; Beltrami, Lílian Vanessa Rossa; Boniatti, Rosiana; Quevedo, Marcela C.; Bastos, A.C.; Oliveira, Cláudia Trindade; Ferreira, M.G.S.; Menezes, Tiago Lemos; Malfatti, Célia de Fraga

doi:10.1590/1980-5373-mr-2016-0623

Cited by 4 publications

(3 citation statements)

References 41 publications

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“…These models were commonly used by other researchers. [30][31][32] The capacitance (C) was substituted by a constant-phase element (Q) so as to take into account the non-ideality of the tinplate and passivation coatings. When the value of n = 1 corresponds to a smooth surface, and therefore the constant-phase element should be substituted by an ideal capacitor C again.…”

Section: Resultsmentioning

confidence: 99%

Passivation and Chemical Conversion Combined Multi-Elements Coating on Low Sn-Coated Steel for Corrosion Protection

Zhao¹,

Yin²,

Shen³

et al. 2022

J. Electrochem. Soc.

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In this work, the tinplate with 0.5 g·m−2 tin coating mass was prepared in order to improve the economic benefit for food packaging field. We studied this low Sn-coated steel surface state and developed a process combined Mo-Mn-Al-P coating based on its special structure. By Taguchi techniques optimization, this chromium-free multi-elements coating has excellent corrosion resistance and adhesion with organic coatings, would be a hopefully replacing traditional chromate passivation treatment on tinplate with low tin coating mass.

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Section: Resultsmentioning

confidence: 99%

Passivation and Chemical Conversion Combined Multi-Elements Coating on Low Sn-Coated Steel for Corrosion Protection

Zhao¹,

Yin²,

Shen³

et al. 2022

J. Electrochem. Soc.

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“…Both chemical and topological properties of metal surfaces are important in the delamination kinetics of polymers from metal surfaces. The electrochemical mechanisms are well studied for such types of systems, , but the topological mechanisms and techniques for visualization are far less explored. The key takeaway from our work is that confocal microscopy can easily detect the early onset of delamination and complements methods such as electrochemical impedance spectroscopy .…”

Section: Discussionmentioning

confidence: 99%

Microstructural Defects of Epoxy–Phenolic Polymers on Metal Substrates during Acidic Corrosion

Serfass

Kotb

Smith

et al. 2022

ACS Appl. Polym. Mater.

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This study uses confocal microscopy and image processing to investigate the microstructural changes of coating–metal systems immersed in a heated acidic bath. Unlike standard optical microscopy techniques, 3D confocal microscopy images can quantitatively reveal microscopic defects formed at early stages of cathodic delamination. The coatings are made of fluorescent epoxy–phenolic resins cured at high temperatures onto tinplate (T23) and tin-free steel (TFS) substrates. When the coated metal substrates are immersed in acetic acid, a series of microscopic corrosion events occur at the polymer–metal interface. These events are quantified by changes in the thickness distribution of the degraded samples relative to that of intact coatings. The degradation rate is highest for epoxy–phenolic polymers on TFS substrates, represented by multiple orders of magnitude increase in the number density of defect sites. Higher molecular weight coatings provide slightly better resistance against delamination. The coating thickness dictates the rate of oxygen diffusion and ion transport along the polymer–coating interface, where raised asperities serve as localized sites for metal oxidation and formation of alkaline species, leading to subsequent delamination of the cured polymers from the surfaces. The results show that the metal surface topology is as important as chemistry when designing the corrosion resistance of products containing acidic liquids, and that confocal microscopy is useful in quality control through early detection of mesoscale polymer failure.

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“…On the other hand, the use of fully coated cans allows reduction of the tin content released in the product and the improvement of the internal appearance of the cans upon opening (Kunst et al., 2017; Montanari et al., 1996; Simal‐Gándara, 1999). The use of coated cans extends to different classes of food products, from those with low and medium acidity containing anthocyanins (such as cherries, sour cherries, etc.)…”

Section: Introductionmentioning

confidence: 99%

Criteria and methodologies for determining the causes of swelling of canned tomatoes in tinplate containers

Squitieri

Pirone

Pietra

et al. 2022

Comp Rev Food Sci Food Safe

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This review provides the current laboratory criteria for the detection and evaluation of the possible causes of alteration of non‐concentrated industrial derivatives of tomatoes (peeled tomatoes, pulps, purees, sauces, and fillets), packaged in coated or uncoated tinplate cans. We discuss how the product alterations are typically the consequence of technological errors either in the can production, or in the storage process, or in the product sterilization. The described procedures include the quantitative determination of the distribution of gases (H2, CO2, N2, and O2) present in the headspace of the container. The gas composition and ratios can be used as markers to allow easy diagnosis of the causes of microbiologic and/or physical–chemical alterations of the tomatoes, which are usually made evident by swelling of the containers. These tests should be integrated by microbiological analyses aimed at a restricted group of microorganisms, with the chemical analysis of the container and the chemical analysis of the altered product. By way of example, we report the assessment of the causes of alteration in four different case‐studies.

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Corrosion Mechanism Suggested Based on Electrochemical Analysis and SVET for Uncoated Tinplate and Post Coated With a Hybrid Film

Cited by 4 publications

References 41 publications

Passivation and Chemical Conversion Combined Multi-Elements Coating on Low Sn-Coated Steel for Corrosion Protection

Passivation and Chemical Conversion Combined Multi-Elements Coating on Low Sn-Coated Steel for Corrosion Protection

Microstructural Defects of Epoxy–Phenolic Polymers on Metal Substrates during Acidic Corrosion

Criteria and methodologies for determining the causes of swelling of canned tomatoes in tinplate containers

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