Abstract: The present invention provides a suspension and method for improving the corrosion protection of substrates which comprise or consist of steel. It has been discovered that if an organic derivative of a bentonite clay and a modified urea are added to a dispersion of flakes of Zn, Al and/or Mg, or alloys thereof, the resulting suspension demonstrates a rheological profile which is ideally suited for coating steel substrates. In fact, the inventive suspension enables coating with a high consistency of performance. The performance of the suspension is already reached after one coating process i.e. even after a dip/spin coating process is conducted only one once. In conclusion, steel substrates can be provided with a high-quality corrosion resistant coating in a more economical way compared to the prior art.

Abstract: The invention relates to a coating or composite moulding or mastic composition comprising, by weight: A) 100 parts of at least one reactive or non-reactive organic binder B) 0.001 to 20 parts of at least one additive comprising cellulose microfibrils modified at the surface by at least one compound B1, the said cellulose microfibrils having an aspect ratio l/d of greater than 20 and a mean cross-section d ranging from 1 to 50 nm, the said compound B1 having at least one hydrophilic part and at least one hydrophobic part, the said microfibrils being modified at the surface by physical route, by physical adsorption of the said compound B1 C) optionally, at least one organic diluent D) optionally, up to 300 parts of at least one component chosen from fillers, fibres, pigments, dyes and other conventional additives. The invention also relates to a specific process for the preparation of this composition, to specific uses and to an intermediate composition for the preparation of such a composition.