abstract

• Conventional weight loss tests and both DC and AC electrochemical techniques were used to study if an organic inhibitor containing an alkanolamine salt of a polycarboxylic acid can substitute toxic coatings as chromating and certain phosphating procedures in the protection of galvanized steel. The electrolyte used was a 0.5 M aerated NaCl solution. All tests gave concordant results, indicating that the chromate-free organic inhibitor does protect galvanized steel in this environment, even though the provided protection was less than that of the chromate conversion coating. It was observed that, after a moderate initial attack, the corrosion rate diminishes due to the appearance and growth of passivating corrosion products layers, mainly constituted by zinc hydroxychloride (Zn 5 (OH) 8 CI 2 ṡ H 2 O) and two varieties of zinc hydroxide, among other crystalline compounds. © 2012 Laura A. Hernandez-Alvarado et al.

authors

• Hernández Hernández Luis Salvador
• Hernández-Alvarado L.A.
• Rodríguez Reyna Sandra Luz

publication date

• 2012-01-01

published in

• International Journal of Corrosion  Journal

keywords

• Chromate conversion coatings; Conversion coatings; Corrosion behavior; Corrosion products; Crystalline compounds; Electrochemical techniques; Organic inhibitors; Polycarboxylic acids; Chromates; Galvanizing; Zinc; Chromate coatings

Digital Object Identifier (DOI)

• 10.1155/2012/368130

start page

end page

volume

• 2012