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Assessment of the properties of diethyl phosphite as a novel anticorrosion pigment in organic coatings

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Abstract

The aim of this work was to provide a first description of the behaviour of diethyl phosphite in organic coatings, description of their physico-mechanical properties as well as anticorrosion properties in the protection of steel substrates. The diethyl phosphite behaviour in the organic coatings depends on the volume concentration of the pigment. A polyaniline base was suspended in diethyl phosphite as a new reactant. The pigment so prepared was used as a corrosion inhibitor in model paints containing a solvent-based epoxy-ester resin as the binder. The organic coatings were applied to steel panels and to glass panels and subjected to mechanical tests, corrosion resistance tests and electrochemical tests. Furthermore, they were exposed to the environments of condensed steam, neutral salt solution mist, and sulphur dioxide-containing mist. The corrosion effects were evaluated and the organic coatings’ overall anticorrosion efficiency was calculated from the results. Ultimately, the optimum pigment volume concentration (PVC) at which the coatings provided the best anticorrosion protection was determined: it was PVC = 10 vol%, whereas the best mechanical resistance was observed at PVC = 5 vol%. The goal of the forthcoming work will be to optimise all the properties into a single pigment volume concentration.

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Abbreviations

B:

Benzoid structure

CMX:

Continuous measurement of X

D:

Dense (the highest frequency of the blistering of paint)

DEPh/PANI:

Diethylphosphite with polyaniline base

DEPh/PANI_10:

Coating of diethyphosphite with polyaniline base with PVC = 10 vol%

DEPh/PANI_15:

Coating of diethyphosphite with polyaniline base with PVC = 15 vol%

DEPh/PANI_17:

Coating of diethyphosphite with polyaniline base with PVC = 17 vol%

DEPh/PANI_5:

Coating of diethyphosphite with polyaniline base with PVC = 5 vol%

DFT:

Dry film thickness

EB:

Emeraldine base

E DEPh/PANI_1 :

Young’s modulus of diethyphosphite with polyaniline base with PVC = 1%

EDX:

Energy-dispersive X-ray spectroscopy

E HCl/PANI :

Young’s modulus of polyaniline hydrochloride

E nER :

Young’s modulus of nonpigmented epoxy-ester resin

ES:

Emeraldine salt

F :

Few (the lowest frequency of the blistering)

HCl/PANI:

Paint of polyaniline hydrochloride

K m :

Corrosion loss reduction %

M:

Medium (frequency of the blistering of paint)

MD:

Medium dense (frequency of the blistering of paint)

M ws,c :

Presence of substances soluble in cold water %

M ws,h :

Presence of substances soluble in hot water %

PANI:

Polyaniline

Q:

Quinoid structure

rpm:

Rotate per minute

SEM:

Scanning electron microscope

UV:

Ultraviolet

x :

Titration share of substances soluble in hot water g L−1

ρ :

Density of pigments g cm−3

Corr:

Corrosion

DEPh/PANI_1:

Coating of diethyphosphite with polyaniline base with PVC = 1 vol%

DEPh/PANI_3:

Coating of diethyphosphite with polyaniline base with PVC = 3 vol%

HCl/PANI:

Polyaniline hydrochloride

m:

Loss reduction

nER:

Nonpigmented epoxy-ester resin

R:

Rate

ws,c:

Soluble in cold water

ws,h:

Soluble in hot water

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Authors and Affiliations

  1. Department of Chemistry and Materials Technology, Faculty of Chemical Technology, University of Pardubice, Studentská 95, 53210, Pardubice, Czech Republic

    Kateřina Nechvílová & Andréa Kalendová

  2. Educational and Research Centre in Transport, Jan Perner Transport Faculty, University of Pardubice, Pardubice, Czech Republic

    Eva Schmidová

  3. Department of Conducting Polymers, Institute of Macromolecular Chemistry AS CR, Heyrovsky Sg. 2, 16206, Prague, Czech Republic

    Patrycja Bober

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  1. Kateřina Nechvílová
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  2. Andréa Kalendová
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  3. Eva Schmidová
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  4. Patrycja Bober
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Correspondence to Kateřina Nechvílová.

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Nechvílová, K., Kalendová, A., Schmidová, E. et al. Assessment of the properties of diethyl phosphite as a novel anticorrosion pigment in organic coatings. Chem. Pap. 71, 423–438 (2017). https://doi.org/10.1007/s11696-016-0085-4

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  • DOI: https://doi.org/10.1007/s11696-016-0085-4

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