abstract

• The purpose of this work was to compare the protective capacity of several alkyd primers pigmented with 12.1 volume percent either of calcium phosphate or micronized zinc phosphate as anticorrosive pigments. A paint containing zinc Chromate was used as reference. The performance of these paints on steel was assessed through Electrochemical Impedance Spectroscopy (EIS) using a 3%25 NaCl solution. After 576 hr immersion, the paint with calcium phosphate and specially that with micronized zinc phosphate, showed a better behavior than paint with zinc Chromate. Paint rating, using impedance parameters (ionic resistance and capacitance of the paint film, and breakpoint frequency), was in agreement with the visible paint deterioration and corrosion. In addition, there was a good correlation between these parameter and the open circuit corrosion potential of the metallic substrate. © 1998 by NACE International.

authors

• Del Amo B.
• García G.
• Hernández Hernández Luis Salvador
• López C.
• Romagnoli R.

publication date

• 1998-01-01

published in

• NACE - International Corrosion Conference Series  Proceedings

keywords

• Alkyd; Breakpoint frequency; Coated steel; Electrochemical Impedance Spectroscopy; Non-toxic pigments; Organic coatings; Zinc Chromate; Zinc phosphate Calcium phosphate; Chromate coatings; Chromates; Corrosion protection; Electrochemical corrosion; Organic coatings; Paint; Phosphate coatings; Sodium chloride; Spectroscopy; Substrates; Zinc coatings; Zinc compounds; Alkyd; Breakpoint; Coated steel; Non-toxic; Zinc chromate; Zinc phosphates; Electrochemical impedance spectroscopy

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volume

• 1998-March