POLLUTION-FREE RUSTPROOF PIGMENT COMPOSITION

摘要

The present invention provides an environmentally pollution-free, anti-corrosive pigment composition which is free of any heavy metal such as lead and/or chromium, which is free of zinc and/or water-soluble ions and which is excellent in the anti-corrosive effect. The anti-corrosive pigment composition comprises condensed calcium phosphate prepared by firing a mixture which comprises a calcium-containing component and a phosphorus-containing component and in which the molar ratio (Ca/P = m) of calcium to phosphorus present in these components falls within the following range: 0.50<m<1.00, at a temperature ranging from 180 to 350°C.