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Identifier

000282918

Title

Σύνθεση, δομικός χαρακτηρισμός και αντιδιαβρωτικές

Author

Καταραχιά, Στέλλα

Thesis advisor

Δημάδης, Κωνσταντίνος

Abstract

Use of natural hard waters in industrial water systems (e.g. cooling, boiler, desalination, oil production etc.) can cause severe scaling and corrosion of equipment surfaces and pose serious technical and economic challenges. Additives commonly used in order to control scale deposit and corrosion include phosphonates. AMP or amino tris-(methylene-phosphonic) acid, Ν(CH2PO3H2)3, is a phosphonate widely used by industry for the treatment of natural hard water. AMP inhibits the formation of scale forming salts such as carbonate (CO2-), phosphate (PO43-), sulfate (SO42-) and silicate salts of calcium (Ca2+), magnesium (Mg2+), barium (Ba2+), strontium (Sr2+) etc. and controls mild steel corrosion. In the present essay synthesis and characterization of the neutral complexes of AMP with Ca2+, Ba2+, Sr2+, Mg2+ and Ζn2+ is being described in order to investigate the crystal structure of these materials. Εach of the Ca2+, Ba2+, Sr2+, Mg2+ and Ζn2+ ions react with ΑΜΡ at a 1:1 molar ratio and at low pH (pH<2) to form the polymeric crystal structures of {Ca[HN(CH2PO3H)3]3.5H2O}x, {Ba[(HN(CH2PO3H)3)(H2O)]}x, {Sr[HN(CH2PO3H)3]}x, {Mg[(HN(CH2PO3H)3)(H2O)3]}x and {Zn[HN(CH2PO3H)3(H2O)3]}x respectively. The structures of these complexes were determined by XRF, FT-IR and elemental analysis. Additionally there has been investigated the competence of AMP in inhibiting the precipitation of CaCO3 as much as the anticorrosion effect of ΑΜΡ together with Ζn2+.

Language

Greek

Subject

AMP

Anticorrosion effect

Calcium carbonate

Crystal growth modification

Hard water treatment

Phosphonates

Polymeric complexes of Ca2+, Ba2+, Sr2+, Mg2+, Ζn2+

Scale inhibition

Ανθρακικό ασβέστιο