Environmentally favorable magnesium phosphate anti-corrosive coating on carbon steel and protective mechanisms

Abstract Polymer coatings are commonly used to protect carbon steels from corrosion but they are susceptible to weathering and many of them have environmental concerns. Therefore, we studied the possibility of an environmentally favorable inorganic magnesium phosphate cement (MPC) coating for protec...

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Autores principales:	Siyi Yin, Haiyan Yang, Yinghao Dong, Chengju Qu, Jinghui Liu, Tailin Guo, Ke Duan
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/dc4b850812dd4adabbd79a74a8f9bc8f
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spelling	oai:doaj.org-article:dc4b850812dd4adabbd79a74a8f9bc8f2021-12-02T11:46:06ZEnvironmentally favorable magnesium phosphate anti-corrosive coating on carbon steel and protective mechanisms10.1038/s41598-020-79613-32045-2322https://doaj.org/article/dc4b850812dd4adabbd79a74a8f9bc8f2021-01-01T00:00:00Zhttps://doi.org/10.1038/s41598-020-79613-3https://doaj.org/toc/2045-2322Abstract Polymer coatings are commonly used to protect carbon steels from corrosion but they are susceptible to weathering and many of them have environmental concerns. Therefore, we studied the possibility of an environmentally favorable inorganic magnesium phosphate cement (MPC) coating for protecting mild steel. A formulation suitable for coating steel was developed by compositional modification [i.e., incremental replacement of dead-burned magnesia (MgO) with magnesium hydroxide (Mg(OH)2)] to a road-repair MPC. This modification yielded an acceptable working time and prevented pore formation at the coating-steel interface. Corrosion monitoring by linear polarization and electrochemical impedance spectroscopy for 14 days found that, the MPC coating substantially increased the linear polarization resistance (Rp) [e.g., day 1: (8.2 ± 1.7) × 103 (nadir value) vs. 495 ± 55 Ω cm−2] and charge transfer resistance (Rct) (e.g., day 1: 9.3 × 103 vs. 3.8 × 102 Ω cm−2). The coated steel underwent neutral sodium chloride (NaCl) salt spray for 2400 h without visible rusting. Immersion for 24 h in liquids simulating the pore fluid indicated that, passivation by the excess MgO in the coating was a major contributor to its anti-corrosive property. Tafel polarization in the liquids found that, corrosion current density (Icorr) followed the rank: 3.5% NaCl solution (6.0 µA cm−2) > 3.5% NaCl solution containing MgO (3.6 µA cm−2) > 3.5% NaCl solution containing fragmented MPC (1.7 µA cm−2), suggesting that a physical barrier effect and dissolved phosphate ions improved its protection. This study shows that, MPC coating is a promising durable and environmentally favorable anti-corrosive material for protecting steel structures in some applications.Siyi YinHaiyan YangYinghao DongChengju QuJinghui LiuTailin GuoKe DuanNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-10 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Siyi Yin Haiyan Yang Yinghao Dong Chengju Qu Jinghui Liu Tailin Guo Ke Duan Environmentally favorable magnesium phosphate anti-corrosive coating on carbon steel and protective mechanisms
description	Abstract Polymer coatings are commonly used to protect carbon steels from corrosion but they are susceptible to weathering and many of them have environmental concerns. Therefore, we studied the possibility of an environmentally favorable inorganic magnesium phosphate cement (MPC) coating for protecting mild steel. A formulation suitable for coating steel was developed by compositional modification [i.e., incremental replacement of dead-burned magnesia (MgO) with magnesium hydroxide (Mg(OH)2)] to a road-repair MPC. This modification yielded an acceptable working time and prevented pore formation at the coating-steel interface. Corrosion monitoring by linear polarization and electrochemical impedance spectroscopy for 14 days found that, the MPC coating substantially increased the linear polarization resistance (Rp) [e.g., day 1: (8.2 ± 1.7) × 103 (nadir value) vs. 495 ± 55 Ω cm−2] and charge transfer resistance (Rct) (e.g., day 1: 9.3 × 103 vs. 3.8 × 102 Ω cm−2). The coated steel underwent neutral sodium chloride (NaCl) salt spray for 2400 h without visible rusting. Immersion for 24 h in liquids simulating the pore fluid indicated that, passivation by the excess MgO in the coating was a major contributor to its anti-corrosive property. Tafel polarization in the liquids found that, corrosion current density (Icorr) followed the rank: 3.5% NaCl solution (6.0 µA cm−2) > 3.5% NaCl solution containing MgO (3.6 µA cm−2) > 3.5% NaCl solution containing fragmented MPC (1.7 µA cm−2), suggesting that a physical barrier effect and dissolved phosphate ions improved its protection. This study shows that, MPC coating is a promising durable and environmentally favorable anti-corrosive material for protecting steel structures in some applications.
format	article
author	Siyi Yin Haiyan Yang Yinghao Dong Chengju Qu Jinghui Liu Tailin Guo Ke Duan
author_facet	Siyi Yin Haiyan Yang Yinghao Dong Chengju Qu Jinghui Liu Tailin Guo Ke Duan
author_sort	Siyi Yin
title	Environmentally favorable magnesium phosphate anti-corrosive coating on carbon steel and protective mechanisms
title_short	Environmentally favorable magnesium phosphate anti-corrosive coating on carbon steel and protective mechanisms
title_full	Environmentally favorable magnesium phosphate anti-corrosive coating on carbon steel and protective mechanisms
title_fullStr	Environmentally favorable magnesium phosphate anti-corrosive coating on carbon steel and protective mechanisms
title_full_unstemmed	Environmentally favorable magnesium phosphate anti-corrosive coating on carbon steel and protective mechanisms
title_sort	environmentally favorable magnesium phosphate anti-corrosive coating on carbon steel and protective mechanisms
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/dc4b850812dd4adabbd79a74a8f9bc8f
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Environmentally favorable magnesium phosphate anti-corrosive coating on carbon steel and protective mechanisms

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