Journal
EUROPEAN JOURNAL OF ENVIRONMENTAL AND CIVIL ENGINEERING
Volume 23, Issue 10, Pages 1265-1274Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/19648189.2017.1363663
Keywords
Cement mortar; phosphates; penetration; stability; corrosion inhibitor
Categories
Funding
- MINECO [BIA2008-05398]
- MINECO/FEDER, Spain [MAT2015-71761-R]
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The penetration of three phosphate compounds in mortar bulk matrix, sodium monofluorophosphate (Na2FPO3) (MFP), disodium hydrogen phosphate (Na2HPO4) (DHP) and trisodium phosphate (Na3PO4) (TSP) has been evaluated using two water: cement ratios (0.5 and 0.6). The mortar samples were immersed in a 5% MFP, DHP or TSP solution for a period of 40 days. Microprobe line profile analysis for phosphorus (P) and fluorine (F) showed similar behaviour for the three soluble phosphates, which penetrated the mortar to a depth of more than 2 mm, below which the P and F contents dropped to almost zero. The stability of the phosphate ions vs. pH was calculated using thermodynamic data to obtain the following stability ranges: pH 2-4 for HFPO -3 ion, pH 5-9 for FPO32- ion, pH 3-6 for H2PO4- ion, pH 8-12 for HPO42- ion, and pH above 11 for PO43- ion. The use of the MFP, DHP and TSP as corrosion inhibitors presents some limitations in the case of total or partial immersion.
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