Borates

Alkalinity of borates is one of the important attributes of their inhibitive properties. They may also form calcium or barium soaps, depending on the pigment, with acidic functional groups in the resin. Borates act as anodic passivators, forming a protective film on metallic substrates.

Barium metaborate (Ba0B203H20)

Barium metaborate is the most important borate pigment. Its color is white. Due to high solubility, pure barium metaborate is not suitable as a pigment; therefore, to control its reactivity and solubility, it is frequently coated with silica.

Calcium borosilicate

Calcium borosilicate is a complex composite of calcium silicate available commercially in grades differing in borate content and oil absorption value. Its anticorrosive properties are derived from the alkalinity of the pigment as well as anodic and cathodic passivation.

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