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Título del libro: Chemical Interaction Of Modified Zinc-Phosphate Green Pigment On Waterborne Coatings In Steel

Autores UNAM:
ALBA COVELO VILLAR;
Autores externos:

Idioma:
Inglés
Año de publicación:
2016
Palabras clave:

Alkalinity; Aluminum compounds; Chromate coatings; Chromates; Coatings; Corrosion protection; Environmental regulations; Lead compounds; Phosphate coatings; Steel; Steel corrosion; Zinc coatings; Cathodic delamination; Chemical interactions; Green pigments; Inhibitive effects; Protection mechanisms; Protection properties; Zinc phosphates; Zinc-aluminium phosphates; Zinc compounds


Resumen:

The use and incorporation of non-toxic, environmental green pigments in coatings binders have become of great importance because environmental regulations has forbidden the use of chromate or lead compounds. However, the efficiency of the green pigments is lower than that obtained by the classical compounds. For this reason, during the past decades, a new class of green pigments based on zinc phosphate composition has been develop in order to protect the steel substrate. This ecological alternative offers a good inhibitive effect in alkaline media depending on the cationic nature of the zinc phosphate pigment. The specific case of the zinc-aluminium-phosphate (ZAP) has evidenced higher protection properties because the coating failure has been notably reduced at cathodic delamination conditions, due to the formation of a zinc-phosphate layer (a-hopeite). The purpose of this chapter is to explain the protection mechanism against corrosion and the chemical interaction between the ZAP pigment and the steel substrate. © 2016 by Scrivener Publishing LLC. All rights reserved.


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