Corrosion inhibition by lithium zinc phosphate pigment

Synthesis and characterization of the fourth generation of zinc phosphate pigment in the presence of benzotriazole

“…Pigments are one of the major components of the organic coatings [5], and some of them can act as inhibitors increasing the corrosion resistance of the metals [2]. Zinc phosphate (ZP), as a classical replacement of toxic chromate compounds has been widely used [4,6,7]. Different researches have focused on the anticorrosive role of ZP but the inhibitive mechanism of this pigment has not been well understood [8,9].…”

Effects of KOH:ZnCl2 mole ratio on the phase formation, morphological and inhibitive properties of potassium zinc phosphate (PZP) pigments

“…Recent findings have clearly revealed that modification of the anionic and/or cationic parts of zinc phosphate could significantly improve its anticorrosive properties. Aluminum zinc phosphate, iron zinc phosphate, lithium zinc phosphate and potassium zinc phosphate [19,[22][23][24][25] are some examples of the cationically modified ZP pigment evaluated for their anticorrosion properties.…”

An organic coating pigmented with strontium aluminium polyphosphate for corrosion protection of zinc alloy coated steel

“…The polymer binder and barrier fillers together contribute to the barrier protection of the metal substrate, while active protection is achieved by incorporation of corrosion inhibitive pigments [4][5][6][7]. Phosphate and polyphosphate inhibitive pigments, which are combined with one or more cations of zinc, calcium, aluminium, lithium, magnesium and strontium [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22], are commonly used to replace traditional chromate-containing pigments that are environmentally hazardous and carcinogenic. These phosphate or polyphosphates pigments are assumed to be sparingly soluble in water but release free ions that protect the metal substrate at locations of coating damage by passivating the exposed metal or by otherwise forming a protective, precipitated, salt film.…”