An organic coating pigmented with strontium aluminium polyphosphate for corrosion protection of zinc alloy coated steel

Yanwen Liu; Xiaorong Zhou; Stuart B. Lyon; Reza Emad; Teruo Hashimoto; Ali Gholinia; George E. Thompson; Derek Graham; Simon R. Gibbon; David Francis

doi:10.1016/j.porgcoat.2016.02.020

An organic coating pigmented with strontium aluminium polyphosphate for corrosion protection of zinc alloy coated steel

Yanwen Liu^*, Xiaorong Zhou, Stuart B. Lyon, Reza Emad, Teruo Hashimoto, Ali Gholinia, George E. Thompson, Derek Graham, Simon R. Gibbon, David Francis

^*Corresponding author for this work

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Abstract

An organic primer pigmented with strontium aluminium polyphosphate for the corrosion protection of zinc alloy coated steel was investigated by electron microscopy and electrochemical impedance spectroscopy after exposure to sodium chloride solution. The development of defects within the organic coating was found to be related to the solubility of the pigment, which resulted in two conflicting effects. On the one hand, the inhibitive species released from the solid pigment reduced the corrosion rate of the metal substrate by formation of precipitated products containing zinc, strontium, aluminium, phosphorus and oxygen. On the other hand, the dissolution of the inhibitive pigment resulted in porosity in the coating that created easy pathways not only for the inhibitors to reach the substrate but also for the aggressive species to migrate inwards to the metal surface and, importantly, for the transport of corrosion products outwards.

Original language	English
Pages (from-to)	29-36
Number of pages	7
Journal	Progress in Organic Coatings
Volume	102
Early online date	6 Apr 2016
DOIs	https://doi.org/10.1016/j.porgcoat.2016.02.020
Publication status	Published - Jan 2017

Keywords

Inhibition
Organic coating
Strontium aluminium polyphosphate

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10.1016/j.porgcoat.2016.02.020

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title = "An organic coating pigmented with strontium aluminium polyphosphate for corrosion protection of zinc alloy coated steel",

abstract = "An organic primer pigmented with strontium aluminium polyphosphate for the corrosion protection of zinc alloy coated steel was investigated by electron microscopy and electrochemical impedance spectroscopy after exposure to sodium chloride solution. The development of defects within the organic coating was found to be related to the solubility of the pigment, which resulted in two conflicting effects. On the one hand, the inhibitive species released from the solid pigment reduced the corrosion rate of the metal substrate by formation of precipitated products containing zinc, strontium, aluminium, phosphorus and oxygen. On the other hand, the dissolution of the inhibitive pigment resulted in porosity in the coating that created easy pathways not only for the inhibitors to reach the substrate but also for the aggressive species to migrate inwards to the metal surface and, importantly, for the transport of corrosion products outwards.",

keywords = "Inhibition, Organic coating, Strontium aluminium polyphosphate",

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year = "2017",

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doi = "10.1016/j.porgcoat.2016.02.020",

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T1 - An organic coating pigmented with strontium aluminium polyphosphate for corrosion protection of zinc alloy coated steel

AU - Liu, Yanwen

AU - Zhou, Xiaorong

AU - Lyon, Stuart B.

AU - Emad, Reza

AU - Hashimoto, Teruo

AU - Gholinia, Ali

AU - Thompson, George E.

AU - Graham, Derek

AU - Gibbon, Simon R.

AU - Francis, David

PY - 2017/1

Y1 - 2017/1

N2 - An organic primer pigmented with strontium aluminium polyphosphate for the corrosion protection of zinc alloy coated steel was investigated by electron microscopy and electrochemical impedance spectroscopy after exposure to sodium chloride solution. The development of defects within the organic coating was found to be related to the solubility of the pigment, which resulted in two conflicting effects. On the one hand, the inhibitive species released from the solid pigment reduced the corrosion rate of the metal substrate by formation of precipitated products containing zinc, strontium, aluminium, phosphorus and oxygen. On the other hand, the dissolution of the inhibitive pigment resulted in porosity in the coating that created easy pathways not only for the inhibitors to reach the substrate but also for the aggressive species to migrate inwards to the metal surface and, importantly, for the transport of corrosion products outwards.

AB - An organic primer pigmented with strontium aluminium polyphosphate for the corrosion protection of zinc alloy coated steel was investigated by electron microscopy and electrochemical impedance spectroscopy after exposure to sodium chloride solution. The development of defects within the organic coating was found to be related to the solubility of the pigment, which resulted in two conflicting effects. On the one hand, the inhibitive species released from the solid pigment reduced the corrosion rate of the metal substrate by formation of precipitated products containing zinc, strontium, aluminium, phosphorus and oxygen. On the other hand, the dissolution of the inhibitive pigment resulted in porosity in the coating that created easy pathways not only for the inhibitors to reach the substrate but also for the aggressive species to migrate inwards to the metal surface and, importantly, for the transport of corrosion products outwards.

KW - Inhibition

KW - Organic coating

KW - Strontium aluminium polyphosphate

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VL - 102

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JO - Progress in Organic Coatings

JF - Progress in Organic Coatings

ER -

An organic coating pigmented with strontium aluminium polyphosphate for corrosion protection of zinc alloy coated steel

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Keywords

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