Zinc and calcium phosphates as alternative to toxic pigments in paints [Fosfatos de zinc y calcio como alternativas a pigmentos toxicos en pinturas] Article uri icon

abstract

  • The anticorrosive behavior of micronized zinc phosphate, micronized zinc molybdophosphate and calcium phosphate has been studied, when these substances are added to paints formulated with an alkyd resin. The anticorrosive action of these pigments is compared with that of both zinc chromate and non-anticorrosive pigments. The performance of these paints was evaluated through electrochemical impedance using a 3%25 sodium chloride solution. After 576 hours of immersion, all paints with phosphate, especially those containing micronized zinc phosphate, showed a slightly better behavior than that of zinc chromate paint. The paint rating using impedance parameters was in agreement with the visible paint deterioration and corrosion.

publication date

  • 2002-01-01