Varieties of inorganic pigments in use

Inorganic pigments include a variety of metal oxides, chromium salts, carbonates, sulfates and sulfides. For example, aluminum, copper, carbon black, zinc white and titanium white are all belong to inorganic pigments.

Main varieties of black pigments are carbon black. Main quality index of carbon black pigment is black and hue. Classification of carbon black by processing methods is variety. Carbon black not only has the coloring properties, but also has excellent weatherability and resistance to thermal oxidation.

Red paint of inorganic pigments mainly is iron oxide red. Iron oxide has a variety of colors, from yellow to red, brown and black. Iron oxide red is the most common iron oxide pigments. It has very good hiding power and tinting strength, chemical resistance and color retention, etc. Because of significant good rust resistance, iron oxide red is used for the production of floor paints and marine paints.

Currently available for auto paint inorganic pigments include titanium dioxide, carbon black, iron oxide, bismuth vanadate yellow, mixed metal oxide pigments as well as flash aluminum Flake pigment and mica pearl powder. After coating and other surface treatments, chromium yellow (PY34) and molybdateorange (PR104) are suitable for automotive coatings in terms of its weather resistance and light resistance performance, but because of toxicity, they are no longer used in automotive coatings. Meanwhile, cadmium red is also disabled on the same grounds.

Bismuth vanadate yellow is a commercialization of an inorganic yellow pigments (PY184) in the 1980s. Its chemical composition is BiVO4/nBi2MoO4, close to lemon yellow hue. It is main features are very low toxicity, bright and clean of color, good heat resistance, weather resistance, light resistance, resistance to chemicals and solvents. Its very good covering power is similar to titanium dioxide with high tinting strength, it is the ideal nontoxic substitute of chrome yellow pigment. But its disadvantages are high density and precipitation.

Mixed metal oxide pigment is a kind of inorganic pigments with an excellent chemical stability. In the crystal structure of stable metal oxide, nonferrous metal ions can show its color. Different oxides compositions can have different colors, such as titanium-nickel yellow (PY53,NiO • Sb2O3 • 20TiO2) antimony, chromium titanium Brown (PBr24,Cr2O3 • Sb2O3 • 31TiO2), cobalt blue (PB28,CoO • Al2O3) and CU-CR-black (PBk28,CuO • Cr2O3), etc. Such pigment is characterized by a very good resistance to high temperature, acid, alkali, lightfastness and weatherability, drawback is the low tinting strength, certain varieties of dispersion is not good enough. They are mainly used for ceramics and enamel colouring, coating is mainly used for high temperature resistance and coil coatings. It is available in light metallic base coat in automotive finishes. Read more!