Лако-красочные материалы — производство

5.2.6.1

Zinc Hydroxyphosphite

In US 4,386,059, a zinc hydroxyphosphite anticorrosive, is described with the theoret­ical formula [2 Zn(OH)2 — ZnHPO3] — x ZnO, wherein x = 0 to 17 [5.88]. This pigment is produced by reacting zinc oxide slurry with phosphorous acid in the presence of a zinc hydroxyphosphite complex promoter [5.88]. It is a white pigment with basic character [5.56].

The effectiveness of this anticorrosive is attributed to the ability of phosphite ions to inhibit anodic corrosion reactions by formation of iron phosphites and phosphates. In addition, the ability to form zinc soaps in oleoresinous resins that also inhibit corrosion, is referred, too [5.55].

5.2.6.2