Brief introduction of metallic pigments

Commonly used metals are aluminum powder, manganese powder, zinc powder, lead powder, metal powder alloy in the form of copper zinc powder (commonly known as powder), zinc aluminum, stainless steel powder.Compared with other pigments, metallic pigments has its particularity. As the powder paint to metal or metal alloy composition, it has a bright metallic luster and color. Difficulties of this, many of the metal pigment used as decorative pigments, such as copper, zinc, and its hue from pale gold until pure gold, colorful items to be coated; aluminum silver hue, but also for decoration. In recent years new varieties of aluminum powder, aluminum flashing used in conjunction with transparent pigments, coating the metal surface is not only bright spot, and colorful, decorative effect is very good; scaly metallic zinc slightly pale light, make the coating material and mixed with the surrounding landscape as a whole, there is camouflage effect. Most of the metal pigments are flake powder, and moved into a film-forming material and the coating film, the floor like leaves are painted with the same parallel, interconnected, each cover, multi-layer arrangement, form a barrier, metal flake resistance off the film-forming material of the micro-holes, to prevent harmful gases or liquids in the outside world in the penetration of the coating to protect the coating and the coating materials are, which is its ability to physically shield corrosion, and zinc in addition to shielding abilities , as well as cathodic protection, a lot of zinc in the coating into a conductive layer connected with each other, when faced electrochemical corrosion coating, due to zinc than iron electrode with negative potential difference, the first to be corrosion, thereby protecting the steel the substrate. Stainless steel powder has good chemical stability, to prevent chemical corrosion.Light color, high gloss metallic powder also heat capacity, type of metal powder almost no absorption of light that reflects visible light, ultraviolet light, the heat radiation is also true, therefore, can be used to require insulation to prevent the items on the light and heat radiation such as storage of oil, gas tank, tower, metal powder can reflect sunlight in more than 60% of ultraviolet rays, so the coating can prevent aging due to UV light, help extend the life of the coating.Metal pigments are very fine powder, and mostly scale-like, but there are also spherical, teardrop-shaped, tree-shaped, are related to its manufacturing methods. Metal powder to be surface-treated pigment that has the characteristics such as dispersion, opacity, etc., can make different surface treatment of metal lipophilic or hydrophilic, to meet the requirements of the different coatings. Most plus-type metal pigment through physical means of production, the pure metal or alloy powder into specific, such as from solid, liquid and gaseous metal into powder. First, the metal powder into the gas phase, such as sublimation Preparation of zinc powder, ultra-fine aluminum powder. Second, the metal powder into a liquid state, such as pneumatic atomization Preparation aluminum, zinc and copper powder. Third, the metal powder into a solid state method, such as cutting, milling manufacture of magnesium, aluminum, stainless steel powder and titanium powder.Usually the metal pigments for powder coatings are mainly aluminum and copper powder, pearl powder. Since the powder coating chosen not contain resin or curing agent is a certain acidic alkaline, and metal oxides for these metals will have a certain extent, so the surface treatment of metallic pigment is particularly important. Although most of the metallic pigment in the factory had been Nepalese surface treatment, powder coating, but the construction can withstand the conditions (200 degrees 10 minutes) the test is problematic. Copper can be used benzotriazole, etc. surface protection, chemical-resistant aluminum to do anything unstable, so the art powder coating silver is often a stage in the use of the phenomenon will appear black. Nickel powder colorless transparent resin in yellow and other colors if it is with transparent resin can be made of gold, orange, yellow-green coating. In the powder coating containing metallic pigments in the coating if you want to create color, hiding power should rely on their paint and metal should not rely on color pigments. Hiding the best selection of low pigmented or transparent pigments, especially titanium dioxide to less or no carbon black. Because the presence of high opacity paint metallic pigments will fade.Metal material properties for more rational use of metal materials, to fully play its role, must master a variety of metal materials of zero components in normal circumstances should have the performance (performance) and its processing in the hot and cold material should be with performance (process performance). Material properties, including the use of physical properties (such as specific gravity, melting point, conductivity, thermal conductivity, thermal expansion, magnetic, etc.), chemical properties (durable corrosion, oxidation resistance), mechanical properties, also known as mechanical properties. Source:http://www.mhcmp.com