Chloride-induced depassivation and corrosion of mild steel in magnesium potassium phosphate cement

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

doi:10.1016/j.corsci.2022.110482

Chloride-induced depassivation and corrosion of mild steel in magnesium potassium phosphate cement

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

Civil Engineering

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Abstract

This study investigated the chloride-induced depassivation and corrosion of mild steel in the magnesium potassium phosphate cement (MKPC) pore solutions at different magnesia-to-phosphate (M/P) ratios via several electrochemical methods and surface characterisations. Results showed that although the pH of MKPC is much lower than that of PC, the corrosion resistance of mild steel is significantly higher, with critical chloride values in MKPC being several orders higher than that in PC. Chloride-induced corrosion resistance increases with increasing M/P ratios. Whilst both pH and HPO₄^2-/PO₄^3- ions influence the formation of corrosion products, the pH plays a dominant role in the corrosion resistance.

Original language	English
Article number	110482
Number of pages	18
Journal	Corrosion Science
Volume	206
Early online date	15 Jul 2022
DOIs	https://doi.org/10.1016/j.corsci.2022.110482
Publication status	Published - Sept 2022

Keywords

Chloride-induced corrosion
Magnesia-to-phosphate ratio
Magnesium phosphate cement
Mild steel

ASJC Scopus subject areas

General Chemistry
General Chemical Engineering
General Materials Science

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10.1016/j.corsci.2022.110482

Author accepted manuscroptAccepted author manuscript, 1.68 MBLicence: CC BY-NC-ND

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title = "Chloride-induced depassivation and corrosion of mild steel in magnesium potassium phosphate cement",

abstract = "This study investigated the chloride-induced depassivation and corrosion of mild steel in the magnesium potassium phosphate cement (MKPC) pore solutions at different magnesia-to-phosphate (M/P) ratios via several electrochemical methods and surface characterisations. Results showed that although the pH of MKPC is much lower than that of PC, the corrosion resistance of mild steel is significantly higher, with critical chloride values in MKPC being several orders higher than that in PC. Chloride-induced corrosion resistance increases with increasing M/P ratios. Whilst both pH and HPO42-/PO43- ions influence the formation of corrosion products, the pH plays a dominant role in the corrosion resistance.",

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AU - Wang, Danqian

AU - Yue, Yanfei

AU - Xie, Zhichao

AU - Mi, Tangwei

AU - Yang, Siyu

AU - McCague, Colum

AU - Qian, Jueshi

AU - Bai, Yun

PY - 2022/9

Y1 - 2022/9

N2 - This study investigated the chloride-induced depassivation and corrosion of mild steel in the magnesium potassium phosphate cement (MKPC) pore solutions at different magnesia-to-phosphate (M/P) ratios via several electrochemical methods and surface characterisations. Results showed that although the pH of MKPC is much lower than that of PC, the corrosion resistance of mild steel is significantly higher, with critical chloride values in MKPC being several orders higher than that in PC. Chloride-induced corrosion resistance increases with increasing M/P ratios. Whilst both pH and HPO42-/PO43- ions influence the formation of corrosion products, the pH plays a dominant role in the corrosion resistance.

AB - This study investigated the chloride-induced depassivation and corrosion of mild steel in the magnesium potassium phosphate cement (MKPC) pore solutions at different magnesia-to-phosphate (M/P) ratios via several electrochemical methods and surface characterisations. Results showed that although the pH of MKPC is much lower than that of PC, the corrosion resistance of mild steel is significantly higher, with critical chloride values in MKPC being several orders higher than that in PC. Chloride-induced corrosion resistance increases with increasing M/P ratios. Whilst both pH and HPO42-/PO43- ions influence the formation of corrosion products, the pH plays a dominant role in the corrosion resistance.

KW - Chloride-induced corrosion

KW - Magnesia-to-phosphate ratio

KW - Magnesium phosphate cement

KW - Mild steel

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Chloride-induced depassivation and corrosion of mild steel in magnesium potassium phosphate cement

Abstract

Keywords

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