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High performance protective coatings for non‐ferrous metals

Hassan S. Emira (Polymers and Pigments Department, National Research Centre, Dokki, Cairo, Egypt)
Alia A. Shakour (Air Pollution Department, National Research Centre, Dokki, Cairo, Egypt)
Sayed S. Abd El Rehim (Chemistry Department, Ain Shams University, Cairo, Egypt)
Inas A. Saleh (Air Pollution Department, National Research Centre, Dokki, Cairo, Egypt)
Mohammed A. El‐Hashemy (Air Pollution Department, National Research Centre, Dokki, Cairo, Egypt)

Anti-Corrosion Methods and Materials

ISSN: 0003-5599

Article publication date: 19 May 2012

334

Abstract

Purpose

The purpose of this paper is to report the use of zinc phosphate pigment as a chromate substitute for coatings on non‐ferrous metals (galvanized steel, pure aluminum, α‐brass and pure copper).

Design/methodology/approach

Paint systems based on zinc chromate and zinc phosphate pigments were prepared. The paints were tested for their physico‐mechanical properties. Testing of the anticorrosive properties of the zinc phosphate pigment in comparison with zinc chromate pigment was carried out by accelerated corrosion exposure, i.e. immersion in 3.5 percent salt solution and exposure for one year at five outdoor stations.

Findings

The possibility of replacing chromate pigment was assessed and the “gap“ observable between the performance of zinc chromate and zinc phosphate pigments was noted.

Originality/value

The non‐toxic inhibitive pigment, zinc phosphate, incorporated into a plasticized‐chlorinated rubber binder, could be applied successfully for the protection of non‐ferrous substrates.

Keywords

Citation

Emira, H.S., Shakour, A.A., Abd El Rehim, S.S., Saleh, I.A. and El‐Hashemy, M.A. (2012), "High performance protective coatings for non‐ferrous metals", Anti-Corrosion Methods and Materials, Vol. 59 No. 3, pp. 139-149. https://doi.org/10.1108/00035591211224681

Publisher

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Emerald Group Publishing Limited

Copyright © 2012, Emerald Group Publishing Limited

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