Zinc tripolyphosphate: An anticorrosive pigment for paints

A study was undertaken to determine the efficiency of zinc tripolyphosphate as an anticorrosive pigment for paints. A procedure to prepare the pigment was outlined and its anticorrosive properties evaluated following the electrochemical behaviour of a steel electrode in pigment suspensions. In a sec...

Full description

Saved in:
Bibliographic Details
Published in:Surface coatings international. Part B, Coatings transactions Coatings transactions, 2003-03, Vol.86 (1), p.79-85
Main Authors: Deyá, M, Vetere, VF, Romagnoli, R, del Amo, B
Format: Article
Language:English
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A study was undertaken to determine the efficiency of zinc tripolyphosphate as an anticorrosive pigment for paints. A procedure to prepare the pigment was outlined and its anticorrosive properties evaluated following the electrochemical behaviour of a steel electrode in pigment suspensions. In a second stage, solvent-borne paints containing barium sulphate, talc and titanium dioxide together with 30 or 10% v/v (by volume) of zinc tripolyphosphate, with respect to the total pigment content, and PVC/CPVC (pigment volume concentration/critical pigment volume concentration) ratio 0.8 were formulated. Two resins were chosen as film-forming materials: an alkyd and an epoxy-polyamide (1:1) resin. The performance of the resulting anticorrosive paints was assessed by accelerated (salt-spray and humidity chambers) and electrochemical tests (corrosion potential, ionic resistance and polarization resistance). It was demonstrated that zinc tripolyphosphate inhibited corrosion when incorporated into a paint film. It showed an excellent performance when employed with the alkyd resin. Good correlation was obtained between accelerated and electrochemical tests.
ISSN:1476-4865
DOI:10.1007/BF02699598