What is the purpose of iron oxide paint?

Mineral Resource of the Month: Iron Oxide Pigments

by U.S. Geological Survey Wednesday, June 20, 2018

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Michael J. Potter, mineral commodity specialist for the U.S. Geological Survey, has compiled the following information on iron oxide pigments.

Iron oxide pigments, which may be natural or synthetic, have been used as colorants since early humans began painting on cave walls. Natural pigments are derived from several iron oxide minerals: Red pigments are derived from hematite. Yellow and brown pigments — ochres, sierras and umbers — are derived from limonite. Magnetite provides a black iron oxide pigment. Micaceous iron oxide is a special form of hematite that occurs in thin metallic gray platelets or flakes. Synthetic pigments are manufactured under controlled conditions such that particle size, distribution and shape can be accurately replicated, resulting in superior uniformity, color quality and chemical purity.

Iron oxide pigments are relatively low-cost materials that resist color change due to exposure to sunlight, have good chemical resistance and are stable under normal ambient conditions. The leading uses of the pigments are in paints, coatings and construction materials such as in concrete products, mortar, paving stones and roofing tiles. Natural pigments are used in primers and undercoats, where color consistency is less critical, whereas synthetic pigments are used in topcoat paints where color consistency is important.

Micaceous iron oxide imparts unique properties to paints and coatings because the flaky particles align in such a way as to resist penetration by moisture and gases. These coatings can prevent corrosion and rusting of metals and also resist blistering, cracking and peeling.

Deposits of iron oxide pigment occur in many countries, but have been significantly developed in only a few. Countries known for production of iron oxide pigments historically include Cyprus, France, Iran, Italy and Spain. Countries with recent significant production include India, Spain and Honduras.

Iron oxide pigments are also created through steelmaking. When steel is treated with hydrochloric acid to remove surface oxides, the acid is regenerated to be recycled and iron oxide is produced. Regenerated iron oxides are used in a variety of filters, inductors and transformers in electronic home appliances and industrial equipment, as well as in flexible magnets, generators, loudspeakers and electric car motors.

New developments in the synthetic iron oxide pigment industry in recent years include granular forms of iron oxides and new versions of nano-sized materials, which are being used in computer disk drives and high-performance loud speakers, and in biology and medicine, including nuclear magnetic resonance imaging.

Visit minerals.usgs.gov/minerals for more information on iron oxide pigments.

IRON OXIDE PIGMENT PRODUCTION AND CONSUMPTION

Total world production of iron oxide pigments (natural: 13 percent and synthetic: 87 percent) in 2006 was approximately 1.4 million metric tons.

China was the world’s leading producer in 2006, with 49 percent of the world’s total production.

In 2007, total estimated U.S. production was 50,000 metric tons valued at about $50 million.

If you are looking for more details, kindly visit Iron Oxide Colors for Roofing.

In 2006, the estimated global market for iron oxide pigments was $1.1 billion.

FUN FACTS

Natural iron oxide pigments have been used in art for tens of thousands of years, since humans created the 32,000-year-old cave paintings at Lascaux, France.

Iron oxide pigments are used as colorants for ceramic glazes, glass, paper, plastic, rubber and textiles as well as in cosmetics and magnetic ink and toner.

Micaceous iron oxide coatings have been used for heavy duty applications in harsh environments, including industrial tanks, refineries, chemical plants, drilling rigs and bridges, and even on the Eiffel Tower.

1. Characteristics: Iron oxide pigments are resistant to strong eye exposure, atmospheric influences, and resistant to fouling gases (such as hydrogen sulfide, etc.).

Sensing effect, strong hiding power and coloring power.

2. Uses: Suitable for coloring and protecting substances of various coatings. Such as alkyd resins, amino alkyds, perchloroethylene resins, polyurethanes, nitros, polyester paints, etc.

In addition, it is also suitable for electrophoretic paint. Low paint, magnetic paint, pencil paint, blending paint, baking paint, anti-rust paint, floor paint, waterline paint, etc. It can also be used in water-based coatings, powder coatings and plastic coatings.

And used in toy paint, decorative paint, furniture paint, house paint, garage paint, parking lot paint, car paint and so on.

3. Method of use: Generally divided into three steps: wetting, grinding and dispersion (paint adjustment). Iron oxide pigments, paints, and fillers are mixed in a batching tank to form a coarse color paste. Different grinding equipment is used according to the different viscosity obtained by adding the solvent. The pulp can be ground with an efficient sand mill (vertical or horizontal) or a ball mill. The primer is generally about 50 microns, and the topcoat is required to be about 40 microns. Then add the tree moon purpose, dry materials, solvents, etc. to adjust the paint dispersion, color matching, viscosity adjustment, etc. in the paint mixing tank, and finally pass. Filter and finished product packaging.

4. Application: Iron oxide pigments have good weather resistance, high purity, good thermal stability, good compatibility with other ingredients in the application system, can absorb ultraviolet rays, prevent degradation of the base material, and have low cost. Can be widely used in coatings. Because of its strong hiding power, it has a strong impermeability to ultraviolet rays and a small water absorption. It can enhance the mechanical strength of the paint film, especially its excellent characteristics in terms of adhesion. Other anti-rust pigments Such as red lead oxide, zinc yellow and other mixed use, can enhance the paint film stability and mechanical strength, is now widely used in various outdoor paints, traffic paints, metal antirust primers and topcoats. Iron oxide pigments used in paints include iron oxide red, iron oxide yellow, iron oxide brown, iron oxide black, iron oxide green, mica iron oxide, and transparent iron oxide products. Among them, iron red products are widely used in large quantities. Permeable iron is most suitable for automotive finishes, wood coloring, can coatings, and pharmaceutical packaging coloring.

Mineral Resource of the Month: Iron Oxide Pigments

Application of iron oxide in paint