Effect of magnesia-to-phosphate ratio on the passivation of mild steel in magnesium potassium phosphate cement

Danqian Wang; Yanfei Yue; Tangwei Mi; Siyu Yang; Colum McCague; Jueshi Qian; Yun Bai

doi:10.1016/j.corsci.2020.108848

Effect of magnesia-to-phosphate ratio on the passivation of mild steel in magnesium potassium phosphate cement

Danqian Wang (Lead / Corresponding author), Yanfei Yue (Lead / Corresponding author), Tangwei Mi (Lead / Corresponding author), Siyu Yang (Lead / Corresponding author), Colum McCague (Lead / Corresponding author), Jueshi Qian (Lead / Corresponding author), Yun Bai (Lead / Corresponding author)

Civil Engineering

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Abstract

The low pH of magnesium potassium phosphate (MKPC) has raised concerns over its capability to protect reinforcing steel. The passivation of mild steel in MKPC pore solutions was investigated in this study via electrochemical measurements, XPS and Raman spectroscopy. Results show that the passivity of mild steel in MKPC was comparable or even better than that in Portland cement. Although the passivity was dominated by the pH of MKPC, it also increases with increasing magnesium-to-phosphate (M/P) ratios. The formation of iron phosphate in the low pH MKPC (such as M/P 7) also made additional contributions to the passivity of steel.

Original language	English
Article number	108848
Number of pages	12
Journal	Corrosion Science
Volume	174
Early online date	1 Jul 2020
DOIs	https://doi.org/10.1016/j.corsci.2020.108848
Publication status	Published - Sept 2020

Keywords

M/P ratio
Mild steel
Passivity
Phosphate
Raman spectroscopy
XPS

ASJC Scopus subject areas

General Chemistry
General Chemical Engineering
General Materials Science

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10.1016/j.corsci.2020.108848

Author accepted manuscriptAccepted author manuscript, 735 KBLicence: CC BY-NC-ND

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title = "Effect of magnesia-to-phosphate ratio on the passivation of mild steel in magnesium potassium phosphate cement",

abstract = "The low pH of magnesium potassium phosphate (MKPC) has raised concerns over its capability to protect reinforcing steel. The passivation of mild steel in MKPC pore solutions was investigated in this study via electrochemical measurements, XPS and Raman spectroscopy. Results show that the passivity of mild steel in MKPC was comparable or even better than that in Portland cement. Although the passivity was dominated by the pH of MKPC, it also increases with increasing magnesium-to-phosphate (M/P) ratios. The formation of iron phosphate in the low pH MKPC (such as M/P 7) also made additional contributions to the passivity of steel.",

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AU - Wang, Danqian

AU - Yue, Yanfei

AU - Mi, Tangwei

AU - Yang, Siyu

AU - McCague, Colum

AU - Qian, Jueshi

AU - Bai, Yun

PY - 2020/9

Y1 - 2020/9

N2 - The low pH of magnesium potassium phosphate (MKPC) has raised concerns over its capability to protect reinforcing steel. The passivation of mild steel in MKPC pore solutions was investigated in this study via electrochemical measurements, XPS and Raman spectroscopy. Results show that the passivity of mild steel in MKPC was comparable or even better than that in Portland cement. Although the passivity was dominated by the pH of MKPC, it also increases with increasing magnesium-to-phosphate (M/P) ratios. The formation of iron phosphate in the low pH MKPC (such as M/P 7) also made additional contributions to the passivity of steel.

AB - The low pH of magnesium potassium phosphate (MKPC) has raised concerns over its capability to protect reinforcing steel. The passivation of mild steel in MKPC pore solutions was investigated in this study via electrochemical measurements, XPS and Raman spectroscopy. Results show that the passivity of mild steel in MKPC was comparable or even better than that in Portland cement. Although the passivity was dominated by the pH of MKPC, it also increases with increasing magnesium-to-phosphate (M/P) ratios. The formation of iron phosphate in the low pH MKPC (such as M/P 7) also made additional contributions to the passivity of steel.

KW - M/P ratio

KW - Mild steel

KW - Passivity

KW - Phosphate

KW - Raman spectroscopy

KW - XPS

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JO - Corrosion Science

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Effect of magnesia-to-phosphate ratio on the passivation of mild steel in magnesium potassium phosphate cement

Abstract

Keywords

ASJC Scopus subject areas

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