Anticorrosion properties of glassy‐crystalline borophosphates in water‐borne coating system

Abstract

Purpose

The purpose of this paper is to synthesise glassy and crystalline Ca‐Zn and Sr‐Zn borophosphates.

Design/methodology/approach

Anticorrosion pigments on the basis of glassy and crystalline borophosphates formulated as 20CaO‐30ZnO‐20B₂O₃‐30P₂O₅ and 20SrO‐30ZnO‐20B₂O₃‐30P₂O₅ were synthesised. The pigments prepared were characterised by means of X‐ray diffraction and their physical‐chemical properties were determined. The pigments synthesised were used to prepare water‐borne styrene‐acrylate coatings with a 10 per cent anticorrosion pigment content. The coatings underwent corrosion tests in a humid environment with SO₂ content and a test in a salt mist environment. The corrosion tests results were compared with industrially produced pigments.

Findings

As the glassy phase reduces the anticorrosion efficiency of the coatings with the Sr‐Zn borophosphate content decreases too. In case of the Ca‐Zn borophosphates, the maximum anticorrosion efficiency was detected with regard to a pigment containing 75 wt% of the glassy phase.

Practical implications

The pigments synthesised can be conveniently used in water‐borne coatings to protect metal bases from corrosion.

Originality/value

The application of the synthesised glassy‐crystalline borophosphate pigments in anticorrosion water‐borne coatings to protect metal bases from corrosion presents a new method. The use and the method of synthesising these anticorrosion pigments are beneficial.

Citation

Mošner, P., Veselý, D., Koudelka, L. and Kalendová, A. (2008), "Anticorrosion properties of glassy‐crystalline borophosphates in water‐borne coating system", Pigment & Resin Technology, Vol. 37 No. 1, pp. 16-20. https://doi.org/10.1108/03699420810839666